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Speed up PP field iteration#7089

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trexfeathers:faster-pp
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Speed up PP field iteration#7089
trexfeathers wants to merge 2 commits into
SciTools:mainfrom
trexfeathers:faster-pp

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🚀 Pull Request

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From a week of real world observations and a 1 hour conversation with Copilot.


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  • benchmark_this Request that this pull request be benchmarked to check if it introduces performance shifts

@trexfeathers trexfeathers added Type: Performance benchmark_this Request that this pull request be benchmarked to check if it introduces performance shifts labels May 14, 2026
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⏱️ Performance Benchmark Report: f7e0401

Performance shifts

Full benchmark results

Benchmarks that have stayed the same:

| Change   | Before [8e9ab2e0]    | After [f7e04014]    |   Ratio | Benchmark (Parameter)                                                                       |
|----------|----------------------|---------------------|---------|---------------------------------------------------------------------------------------------|
|          | 18.4±0.3ms           | 17.8±0.2ms          |    0.97 | aggregate_collapse.Aggregation.time_aggregated_by_COUNT(False)                              |
|          | 47.7±0.4ms           | 47.6±0.8ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_COUNT(True)                               |
|          | 30.4±0.6ms           | 30.6±0.4ms          |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_FAST_PERCENTILE(False)                    |
|          | 148±1ms              | 146±1ms             |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_FAST_PERCENTILE(True)                     |
|          | 19.8±0.2ms           | 19.8±0.4ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_GMEAN(False)                              |
|          | 27.7±0.2ms           | 27.7±0.3ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_GMEAN(True)                               |
|          | 20.1±0.3ms           | 20.2±0.4ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_HMEAN(False)                              |
|          | 28.2±0.4ms           | 28.2±0.6ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_HMEAN(True)                               |
|          | 17.9±0.1ms           | 18.1±0.3ms          |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_MAX(False)                                |
|          | 39.7±0.5ms           | 39.4±0.4ms          |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_MAX(True)                                 |
|          | 119±5ms              | 119±9ms             |    1    | aggregate_collapse.Aggregation.time_aggregated_by_MAX_RUN(False)                            |
|          | 122±2ms              | 121±4ms             |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_MAX_RUN(True)                             |
|          | 19.0±0.2ms           | 18.8±0.1ms          |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_MEAN(False)                               |
|          | 43.3±0.3ms           | 43.1±0.4ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_MEAN(True)                                |
|          | 20.3±0.3ms           | 20.5±0.2ms          |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_MEDIAN(False)                             |
|          | 51.3±0.5ms           | 51.7±0.7ms          |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_MEDIAN(True)                              |
|          | 17.9±0.3ms           | 18.1±0.3ms          |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_MIN(False)                                |
|          | 39.9±0.8ms           | 39.2±0.4ms          |    0.98 | aggregate_collapse.Aggregation.time_aggregated_by_MIN(True)                                 |
|          | 932±5ms              | 921±10ms            |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_PEAK(False)                               |
|          | 934±20ms             | 911±20ms            |    0.98 | aggregate_collapse.Aggregation.time_aggregated_by_PEAK(True)                                |
|          | 163±2ms              | 162±2ms             |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_PERCENTILE(False)                         |
|          | 274±6ms              | 275±5ms             |    1    | aggregate_collapse.Aggregation.time_aggregated_by_PERCENTILE(True)                          |
|          | 18.7±0.1ms           | 18.7±0.3ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_PROPORTION(False)                         |
|          | 26.2±0.3ms           | 26.5±0.3ms          |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_PROPORTION(True)                          |
|          | 19.0±0.2ms           | 18.8±0.2ms          |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_RMS(False)                                |
|          | 52.4±0.9ms           | 52.2±0.5ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_RMS(True)                                 |
|          | 20.0±0.4ms           | 19.9±0.3ms          |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_STD_DEV(False)                            |
|          | 55.4±0.4ms           | 54.8±0.5ms          |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_STD_DEV(True)                             |
|          | 19.7±0.3ms           | 19.5±0.3ms          |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_VARIANCE(False)                           |
|          | 52.0±0.6ms           | 52.0±0.4ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_VARIANCE(True)                            |
|          | 6.99±0.1ms           | 6.74±0.2ms          |    0.97 | aggregate_collapse.Aggregation.time_collapsed_by_COUNT(False)                               |
|          | 19.3±0.09ms          | 19.1±0.2ms          |    0.99 | aggregate_collapse.Aggregation.time_collapsed_by_COUNT(True)                                |
|          | 17.7±0.2ms           | 17.4±0.2ms          |    0.98 | aggregate_collapse.Aggregation.time_collapsed_by_FAST_PERCENTILE(False)                     |
|          | 108±2ms              | 107±2ms             |    0.99 | aggregate_collapse.Aggregation.time_collapsed_by_FAST_PERCENTILE(True)                      |
|          | 7.19±0.1ms           | 7.27±0.1ms          |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_GMEAN(False)                               |
|          | 17.3±0.1ms           | 17.7±0.2ms          |    1.02 | aggregate_collapse.Aggregation.time_collapsed_by_GMEAN(True)                                |
|          | 7.14±0.1ms           | 7.14±0.1ms          |    1    | aggregate_collapse.Aggregation.time_collapsed_by_HMEAN(False)                               |
|          | 17.5±0.06ms          | 17.3±0.08ms         |    0.99 | aggregate_collapse.Aggregation.time_collapsed_by_HMEAN(True)                                |
|          | 6.66±0.03ms          | 6.66±0.04ms         |    1    | aggregate_collapse.Aggregation.time_collapsed_by_MAX(False)                                 |
|          | 18.0±0.2ms           | 18.1±0.2ms          |    1    | aggregate_collapse.Aggregation.time_collapsed_by_MAX(True)                                  |
|          | 22.6±0.4ms           | 22.1±0.2ms          |    0.98 | aggregate_collapse.Aggregation.time_collapsed_by_MAX_RUN(False)                             |
|          | 31.3±0.7ms           | 31.6±0.3ms          |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_MAX_RUN(True)                              |
|          | 6.96±0.04ms          | 7.10±0.05ms         |    1.02 | aggregate_collapse.Aggregation.time_collapsed_by_MEAN(False)                                |
|          | 18.2±0.4ms           | 18.4±0.2ms          |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_MEAN(True)                                 |
|          | 7.94±0.1ms           | 7.86±0.05ms         |    0.99 | aggregate_collapse.Aggregation.time_collapsed_by_MEDIAN(False)                              |
|          | 20.4±0.2ms           | 20.5±0.4ms          |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_MEDIAN(True)                               |
|          | 6.66±0.04ms          | 6.86±0.2ms          |    1.03 | aggregate_collapse.Aggregation.time_collapsed_by_MIN(False)                                 |
|          | 17.9±0.3ms           | 18.0±0.2ms          |    1    | aggregate_collapse.Aggregation.time_collapsed_by_MIN(True)                                  |
|          | 559±1ms              | 565±5ms             |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_PEAK(False)                                |
|          | 567±2ms              | 574±8ms             |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_PEAK(True)                                 |
|          | 36.2±0.4ms           | 36.0±0.4ms          |    0.99 | aggregate_collapse.Aggregation.time_collapsed_by_PERCENTILE(False)                          |
|          | 115±0.8ms            | 116±0.9ms           |    1    | aggregate_collapse.Aggregation.time_collapsed_by_PERCENTILE(True)                           |
|          | 7.05±0.1ms           | 6.97±0.1ms          |    0.99 | aggregate_collapse.Aggregation.time_collapsed_by_PROPORTION(False)                          |
|          | 17.3±0.4ms           | 17.4±0.3ms          |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_PROPORTION(True)                           |
|          | 6.96±0.09ms          | 7.02±0.05ms         |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_RMS(False)                                 |
|          | 20.0±0.2ms           | 19.6±0.2ms          |    0.98 | aggregate_collapse.Aggregation.time_collapsed_by_RMS(True)                                  |
|          | 7.39±0.04ms          | 7.19±0.07ms         |    0.97 | aggregate_collapse.Aggregation.time_collapsed_by_STD_DEV(False)                             |
|          | 19.4±0.4ms           | 19.4±0.2ms          |    1    | aggregate_collapse.Aggregation.time_collapsed_by_STD_DEV(True)                              |
|          | 7.23±0.1ms           | 7.18±0.2ms          |    0.99 | aggregate_collapse.Aggregation.time_collapsed_by_VARIANCE(False)                            |
|          | 18.9±0.2ms           | 18.9±0.2ms          |    1    | aggregate_collapse.Aggregation.time_collapsed_by_VARIANCE(True)                             |
|          | 19.5±0.3ms           | 19.2±0.3ms          |    0.98 | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_MEAN(False)                     |
|          | 76.1±1ms             | 75.3±1ms            |    0.99 | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_MEAN(True)                      |
|          | 19.4±0.3ms           | 19.2±0.2ms          |    0.99 | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_RMS(False)                      |
|          | 86.1±1ms             | 85.4±0.7ms          |    0.99 | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_RMS(True)                       |
|          | 18.0±0.2ms           | 18.4±0.3ms          |    1.02 | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_SUM(False)                      |
|          | 48.9±0.7ms           | 48.0±0.5ms          |    0.98 | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_SUM(True)                       |
|          | 7.27±0.1ms           | 7.33±0.2ms          |    1.01 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_MEAN(False)                      |
|          | 24.5±0.6ms           | 24.5±0.6ms          |    1    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_MEAN(True)                       |
|          | 7.11±0.06ms          | 7.08±0.05ms         |    1    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_RMS(False)                       |
|          | 25.3±0.7ms           | 25.7±0.6ms          |    1.01 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_RMS(True)                        |
|          | 7.01±0.06ms          | 6.96±0.03ms         |    0.99 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_SUM(False)                       |
|          | 20.0±0.1ms           | 19.8±0.3ms          |    0.99 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_SUM(True)                        |
|          | 173±3ms              | 167±3ms             |    0.97 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_WPERCENTILE(False)               |
|          | 223±3ms              | 220±4ms             |    0.99 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_WPERCENTILE(True)                |
|          | 930±10μs             | 928±20μs            |    1    | cube.CubeCreation.time_create(False, 'construct')                                           |
|          | 323±4μs              | 327±3μs             |    1.01 | cube.CubeCreation.time_create(False, 'instantiate')                                         |
|          | 1.58±0.03ms          | 1.59±0.01ms         |    1.01 | cube.CubeCreation.time_create(True, 'construct')                                            |
|          | 1.11±0.02ms          | 1.12±0.01ms         |    1.01 | cube.CubeCreation.time_create(True, 'instantiate')                                          |
|          | 77.3±1ms             | 77.4±1ms            |    1    | cube.CubeEquality.time_equality(False, False, 'all_equal')                                  |
|          | 22.5±0.9ms           | 22.4±2ms            |    1    | cube.CubeEquality.time_equality(False, False, 'coord_inequality')                           |
|          | 88.0±2ms             | 89.4±1ms            |    1.02 | cube.CubeEquality.time_equality(False, False, 'data_inequality')                            |
|          | 15.2±0.1μs           | 15.1±0.1μs          |    1    | cube.CubeEquality.time_equality(False, False, 'metadata_inequality')                        |
|          | 81.3±2ms             | 81.0±2ms            |    1    | cube.CubeEquality.time_equality(False, True, 'all_equal')                                   |
|          | 23.9±0.8ms           | 24.5±0.8ms          |    1.02 | cube.CubeEquality.time_equality(False, True, 'coord_inequality')                            |
|          | 92.1±1ms             | 92.0±1ms            |    1    | cube.CubeEquality.time_equality(False, True, 'data_inequality')                             |
|          | 15.4±0.1μs           | 15.3±0.07μs         |    0.99 | cube.CubeEquality.time_equality(False, True, 'metadata_inequality')                         |
|          | 147±1ms              | 147±1ms             |    1    | cube.CubeEquality.time_equality(True, False, 'all_equal')                                   |
|          | 56.5±0.8ms           | 56.9±0.4ms          |    1.01 | cube.CubeEquality.time_equality(True, False, 'coord_inequality')                            |
|          | 173±2ms              | 172±1ms             |    0.99 | cube.CubeEquality.time_equality(True, False, 'data_inequality')                             |
|          | 42.7±0.3μs           | 42.2±0.2μs          |    0.99 | cube.CubeEquality.time_equality(True, False, 'metadata_inequality')                         |
|          | 210±3ms              | 211±8ms             |    1    | cube.CubeEquality.time_equality(True, True, 'all_equal')                                    |
|          | 119±2ms              | 118±3ms             |    0.99 | cube.CubeEquality.time_equality(True, True, 'coord_inequality')                             |
|          | 236±2ms              | 235±8ms             |    1    | cube.CubeEquality.time_equality(True, True, 'data_inequality')                              |
|          | 285±3μs              | 285±2μs             |    1    | cube.CubeEquality.time_equality(True, True, 'metadata_inequality')                          |
|          | 879±4μs              | 887±9μs             |    1.01 | import_iris.Iris.time__concatenate                                                          |
|          | 193±3μs              | 194±5μs             |    1    | import_iris.Iris.time__constraints                                                          |
|          | 106±4μs              | 109±3μs             |    1.03 | import_iris.Iris.time__data_manager                                                         |
|          | 75.0±2μs             | 73.9±1μs            |    0.99 | import_iris.Iris.time__deprecation                                                          |
|          | 140±2μs              | 138±4μs             |    0.98 | import_iris.Iris.time__lazy_data                                                            |
|          | 960±5μs              | 993±10μs            |    1.03 | import_iris.Iris.time__merge                                                                |
|          | 51.3±0.2μs           | 51.0±0.3μs          |    0.99 | import_iris.Iris.time__representation                                                       |
|          | 686±5μs              | 681±4μs             |    0.99 | import_iris.Iris.time_analysis                                                              |
|          | 115±0.8μs            | 114±1μs             |    0.99 | import_iris.Iris.time_analysis__area_weighted                                               |
|          | 71.0±3μs             | 71.1±2μs            |    1    | import_iris.Iris.time_analysis__grid_angles                                                 |
|          | 260±2μs              | 258±2μs             |    0.99 | import_iris.Iris.time_analysis__interpolation                                               |
|          | 183±3μs              | 181±2μs             |    0.99 | import_iris.Iris.time_analysis__regrid                                                      |
|          | 93.4±0.5μs           | 93.8±1μs            |    1    | import_iris.Iris.time_analysis__scipy_interpolate                                           |
|          | 98.5±2μs             | 96.0±1μs            |    0.97 | import_iris.Iris.time_analysis_calculus                                                     |
|          | 318±2μs              | 320±2μs             |    1.01 | import_iris.Iris.time_analysis_cartography                                                  |
|          | 60.5±0.8μs           | 59.4±2μs            |    0.98 | import_iris.Iris.time_analysis_geomerty                                                     |
|          | 193±2μs              | 192±2μs             |    1    | import_iris.Iris.time_analysis_maths                                                        |
|          | 60.8±0.9μs           | 61.1±2μs            |    1    | import_iris.Iris.time_analysis_stats                                                        |
|          | 160±2μs              | 160±7μs             |    1    | import_iris.Iris.time_analysis_trajectory                                                   |
|          | 363±10μs             | 369±20μs            |    1.02 | import_iris.Iris.time_aux_factory                                                           |
|          | 55.4±0.4μs           | 55.5±0.8μs          |    1    | import_iris.Iris.time_common                                                                |
|          | 159±2μs              | 160±6μs             |    1.01 | import_iris.Iris.time_common_lenient                                                        |
|          | 1.42±0.01ms          | 1.43±0.03ms         |    1    | import_iris.Iris.time_common_metadata                                                       |
|          | 178±2μs              | 174±3μs             |    0.98 | import_iris.Iris.time_common_mixin                                                          |
|          | 1.27±0ms             | 1.27±0.01ms         |    1    | import_iris.Iris.time_common_resolve                                                        |
|          | 185±2μs              | 185±1μs             |    1    | import_iris.Iris.time_config                                                                |
|          | 97.9±1μs             | 94.7±2μs            |    0.97 | import_iris.Iris.time_coord_categorisation                                                  |
|          | 439±5μs              | 436±30μs            |    0.99 | import_iris.Iris.time_coord_systems                                                         |
|          | 947±5μs              | 936±6μs             |    0.99 | import_iris.Iris.time_coords                                                                |
|          | 864±80μs             | 828±80μs            |    0.96 | import_iris.Iris.time_cube                                                                  |
|          | 237±1μs              | 234±2μs             |    0.99 | import_iris.Iris.time_exceptions                                                            |
|          | 51.3±0.2μs           | 51.2±0.2μs          |    1    | import_iris.Iris.time_experimental                                                          |
|          | 142±1μs              | 141±2μs             |    1    | import_iris.Iris.time_fileformats                                                           |
|          | 263±4μs              | 265±4μs             |    1.01 | import_iris.Iris.time_fileformats__ff                                                       |
|          | 2.61±0.01ms          | 2.63±0.02ms         |    1.01 | import_iris.Iris.time_fileformats__ff_cross_references                                      |
|          | 49.8±0.6μs           | 49.7±0.9μs          |    1    | import_iris.Iris.time_fileformats__pp_lbproc_pairs                                          |
|          | 89.8±2μs             | 92.2±3μs            |    1.03 | import_iris.Iris.time_fileformats_abf                                                       |
|          | 505±7μs              | 503±10μs            |    1    | import_iris.Iris.time_fileformats_cf                                                        |
|          | 4.90±0.03ms          | 4.91±0.05ms         |    1    | import_iris.Iris.time_fileformats_dot                                                       |
|          | 47.1±0.4μs           | 46.8±0.7μs          |    0.99 | import_iris.Iris.time_fileformats_name                                                      |
|          | 240±2μs              | 243±1μs             |    1.01 | import_iris.Iris.time_fileformats_name_loaders                                              |
|          | 85.9±1μs             | 86.4±3μs            |    1.01 | import_iris.Iris.time_fileformats_netcdf                                                    |
|          | 141±5μs              | 134±2μs             |    0.95 | import_iris.Iris.time_fileformats_nimrod                                                    |
|          | 290±4μs              | 293±5μs             |    1.01 | import_iris.Iris.time_fileformats_nimrod_load_rules                                         |
|          | 910±20μs             | 905±5μs             |    0.99 | import_iris.Iris.time_fileformats_pp                                                        |
|          | 142±1μs              | 137±5μs             |    0.96 | import_iris.Iris.time_fileformats_pp_load_rules                                             |
|          | 98.3±0.8μs           | 93.7±0.8μs          |    0.95 | import_iris.Iris.time_fileformats_pp_save_rules                                             |
|          | 543±3μs              | 534±3μs             |    0.98 | import_iris.Iris.time_fileformats_rules                                                     |
|          | 233±2μs              | 233±2μs             |    1    | import_iris.Iris.time_fileformats_structured_array_identification                           |
|          | 55.4±0.7μs           | 55.0±0.3μs          |    0.99 | import_iris.Iris.time_fileformats_um                                                        |
|          | 134±3μs              | 134±1μs             |    0.99 | import_iris.Iris.time_fileformats_um__fast_load                                             |
|          | 130±3μs              | 125±1μs             |    0.97 | import_iris.Iris.time_fileformats_um__fast_load_structured_fields                           |
|          | 47.2±0.3μs           | 47.5±0.3μs          |    1.01 | import_iris.Iris.time_fileformats_um__ff_replacement                                        |
|          | 51.0±0.9μs           | 50.7±0.4μs          |    0.99 | import_iris.Iris.time_fileformats_um__optimal_array_structuring                             |
|          | 977±7μs              | 982±7μs             |    1.01 | import_iris.Iris.time_fileformats_um_cf_map                                                 |
|          | 106±1μs              | 107±1μs             |    1.01 | import_iris.Iris.time_io                                                                    |
|          | 183±2μs              | 181±3μs             |    0.99 | import_iris.Iris.time_io_format_picker                                                      |
|          | 179±0.7μs            | 180±0.9μs           |    1    | import_iris.Iris.time_iris                                                                  |
|          | 107±1μs              | 108±4μs             |    1.01 | import_iris.Iris.time_iterate                                                               |
|          | 6.92±0.04ms          | 6.95±0.07ms         |    1    | import_iris.Iris.time_palette                                                               |
|          | 1.76±0.03ms          | 1.77±0.01ms         |    1.01 | import_iris.Iris.time_plot                                                                  |
|          | 192±3μs              | 192±2μs             |    1    | import_iris.Iris.time_quickplot                                                             |
|          | 2.19±0.02ms          | 2.22±0.03ms         |    1.01 | import_iris.Iris.time_std_names                                                             |
|          | 1.57±0ms             | 1.57±0.01ms         |    1    | import_iris.Iris.time_symbols                                                               |
|          | 45.7±4ms             | 42.8±3ms            |    0.94 | import_iris.Iris.time_tests                                                                 |
|          | 193±2μs              | 184±2μs             |    0.96 | import_iris.Iris.time_third_party_cartopy                                                   |
|          | 5.22±0.04ms          | 5.26±0.1ms          |    1.01 | import_iris.Iris.time_third_party_cf_units                                                  |
|          | 88.4±1μs             | 89.8±0.9μs          |    1.02 | import_iris.Iris.time_third_party_cftime                                                    |
|          | 2.62±0.01ms          | 2.66±0.03ms         |    1.02 | import_iris.Iris.time_third_party_matplotlib                                                |
|          | 526±2μs              | 526±3μs             |    1    | import_iris.Iris.time_third_party_numpy                                                     |
|          | 133±3μs              | 129±3μs             |    0.97 | import_iris.Iris.time_third_party_scipy                                                     |
|          | 80.6±3μs             | 80.2±1μs            |    0.99 | import_iris.Iris.time_time                                                                  |
|          | 877±7μs              | 879±10μs            |    1    | import_iris.Iris.time_util                                                                  |
|          | 77.2±4μs             | 76.6±0.8μs          |    0.99 | iterate.IZip.time_izip                                                                      |
|          | 9.06±0.1ms           | 8.99±0.04ms         |    0.99 | load.LoadAndRealise.time_load((1280, 960, 5), False, 'FF')                                  |
|          | 16.1±0.4ms           | 15.8±0.3ms          |    0.98 | load.LoadAndRealise.time_load((1280, 960, 5), False, 'NetCDF')                              |
|          | 9.05±0.09ms          | 8.82±0.05ms         |    0.97 | load.LoadAndRealise.time_load((1280, 960, 5), False, 'PP')                                  |
|          | 9.02±0.07ms          | 8.99±0.2ms          |    1    | load.LoadAndRealise.time_load((1280, 960, 5), True, 'FF')                                   |
|          | 12.9±0.06ms          | 12.9±0.07ms         |    1    | load.LoadAndRealise.time_load((1280, 960, 5), True, 'NetCDF')                               |
|          | 9.09±0.1ms           | 8.85±0.05ms         |    0.97 | load.LoadAndRealise.time_load((1280, 960, 5), True, 'PP')                                   |
|          | 1.35±0.01s           | 1.32±0.01s          |    0.98 | load.LoadAndRealise.time_load((2, 2, 1000), False, 'FF')                                    |
|          | 11.9±0.07ms          | 11.8±0.08ms         |    0.99 | load.LoadAndRealise.time_load((2, 2, 1000), False, 'NetCDF')                                |
|          | 1.35±0.01s           | 1.31±0.01s          |    0.97 | load.LoadAndRealise.time_load((2, 2, 1000), False, 'PP')                                    |
|          | 1.32±0.02s           | 1.33±0.01s          |    1.01 | load.LoadAndRealise.time_load((2, 2, 1000), True, 'FF')                                     |
|          | 11.9±0.1ms           | 11.9±0.06ms         |    1    | load.LoadAndRealise.time_load((2, 2, 1000), True, 'NetCDF')                                 |
|          | 1.34±0.01s           | 1.30±0.01s          |    0.97 | load.LoadAndRealise.time_load((2, 2, 1000), True, 'PP')                                     |
|          | 4.81±0.1ms           | 4.81±0.05ms         |    1    | load.LoadAndRealise.time_load((50, 50, 2), False, 'FF')                                     |
|          | 11.7±0.1ms           | 11.6±0.04ms         |    0.99 | load.LoadAndRealise.time_load((50, 50, 2), False, 'NetCDF')                                 |
|          | 4.77±0.05ms          | 4.67±0.04ms         |    0.98 | load.LoadAndRealise.time_load((50, 50, 2), False, 'PP')                                     |
|          | 4.90±0.05ms          | 4.79±0.1ms          |    0.98 | load.LoadAndRealise.time_load((50, 50, 2), True, 'FF')                                      |
|          | 11.6±0.09ms          | 11.6±0.09ms         |    1    | load.LoadAndRealise.time_load((50, 50, 2), True, 'NetCDF')                                  |
|          | 4.73±0.06ms          | 4.68±0.03ms         |    0.99 | load.LoadAndRealise.time_load((50, 50, 2), True, 'PP')                                      |
|          | 24.1±0.4ms           | 22.8±0.6ms          |    0.95 | load.LoadAndRealise.time_realise((1280, 960, 5), False, 'FF')                               |
|          | 18.6±0.8ms           | 18.2±1ms            |    0.98 | load.LoadAndRealise.time_realise((1280, 960, 5), False, 'NetCDF')                           |
|          | 12.5±1ms             | 12.4±1ms            |    1    | load.LoadAndRealise.time_realise((1280, 960, 5), False, 'PP')                               |
|          | 30.0±0.7ms           | 30.2±1ms            |    1.01 | load.LoadAndRealise.time_realise((1280, 960, 5), True, 'FF')                                |
|          | 85.2±0.4ms           | 85.3±0.4ms          |    1    | load.LoadAndRealise.time_realise((1280, 960, 5), True, 'NetCDF')                            |
|          | 29.3±1ms             | 28.7±1ms            |    0.98 | load.LoadAndRealise.time_realise((1280, 960, 5), True, 'PP')                                |
|          | 562±2ms              | 556±3ms             |    0.99 | load.LoadAndRealise.time_realise((2, 2, 1000), False, 'FF')                                 |
|          | 3.01±0.08ms          | 2.99±0.05ms         |    1    | load.LoadAndRealise.time_realise((2, 2, 1000), False, 'NetCDF')                             |
|          | 561±2ms              | 558±2ms             |    0.99 | load.LoadAndRealise.time_realise((2, 2, 1000), False, 'PP')                                 |
|          | 576±4ms              | 572±1ms             |    0.99 | load.LoadAndRealise.time_realise((2, 2, 1000), True, 'FF')                                  |
|          | 3.08±0.04ms          | 3.08±0.06ms         |    1    | load.LoadAndRealise.time_realise((2, 2, 1000), True, 'NetCDF')                              |
|          | 571±2ms              | 565±2ms             |    0.99 | load.LoadAndRealise.time_realise((2, 2, 1000), True, 'PP')                                  |
|          | 2.00±0.03ms          | 2.02±0.06ms         |    1.01 | load.LoadAndRealise.time_realise((50, 50, 2), False, 'FF')                                  |
|          | 3.00±0.06ms          | 3.03±0.04ms         |    1.01 | load.LoadAndRealise.time_realise((50, 50, 2), False, 'NetCDF')                              |
|          | 2.04±0.05ms          | 2.03±0.04ms         |    0.99 | load.LoadAndRealise.time_realise((50, 50, 2), False, 'PP')                                  |
|          | 2.05±0.03ms          | 2.06±0.03ms         |    1    | load.LoadAndRealise.time_realise((50, 50, 2), True, 'FF')                                   |
|          | 3.09±0.06ms          | 3.07±0.03ms         |    0.99 | load.LoadAndRealise.time_realise((50, 50, 2), True, 'NetCDF')                               |
|          | 2.05±0.03ms          | 2.03±0.03ms         |    0.99 | load.LoadAndRealise.time_realise((50, 50, 2), True, 'PP')                                   |
|          | 321±2ms              | 325±3ms             |    1.01 | load.ManyCubes.time_many_cube_load                                                          |
|          | 87.5±0.4ms           | 86.7±0.5ms          |    0.99 | load.ManyVars.time_many_var_load                                                            |
|          | 9.08±0.1ms           | 9.12±0.09ms         |    1    | load.STASHConstraint.time_stash_constraint((1280, 960, 5), 'FF')                            |
|          | 9.15±0.09ms          | 8.97±0.08ms         |    0.98 | load.STASHConstraint.time_stash_constraint((1280, 960, 5), 'PP')                            |
|          | 1.32±0.01s           | 1.33±0.01s          |    1.01 | load.STASHConstraint.time_stash_constraint((2, 2, 1000), 'FF')                              |
|          | 1.35±0.01s           | 1.32±0.01s          |    0.98 | load.STASHConstraint.time_stash_constraint((2, 2, 1000), 'PP')                              |
|          | 4.85±0.05ms          | 4.87±0.05ms         |    1    | load.STASHConstraint.time_stash_constraint((2, 2, 2), 'FF')                                 |
|          | 4.89±0.03ms          | 4.73±0.06ms         |    0.97 | load.STASHConstraint.time_stash_constraint((2, 2, 2), 'PP')                                 |
|          | 8.33±0.1ms           | 8.29±0.08ms         |    1    | load.StructuredFF.time_structured_load((1280, 960, 5), False)                               |
|          | 5.25±0.03ms          | 5.24±0.04ms         |    1    | load.StructuredFF.time_structured_load((1280, 960, 5), True)                                |
|          | 1.33±0.01s           | 1.31±0.01s          |    0.98 | load.StructuredFF.time_structured_load((2, 2, 1000), False)                                 |
|          | 374±6ms              | 385±9ms             |    1.03 | load.StructuredFF.time_structured_load((2, 2, 1000), True)                                  |
|          | 4.05±0.04ms          | 4.07±0.04ms         |    1    | load.StructuredFF.time_structured_load((2, 2, 2), False)                                    |
|          | 3.99±0.05ms          | 3.99±0.02ms         |    1    | load.StructuredFF.time_structured_load((2, 2, 2), True)                                     |
|          | 139±1ms              | 139±1ms             |    1    | load.TimeConstraint.time_time_constraint(20, 'FF')                                          |
|          | 14.1±0.06ms          | 14.2±0.1ms          |    1.01 | load.TimeConstraint.time_time_constraint(20, 'NetCDF')                                      |
|          | 142±2ms              | 140±2ms             |    0.98 | load.TimeConstraint.time_time_constraint(20, 'PP')                                          |
|          | 28.0±0.8ms           | 28.0±0.2ms          |    1    | load.TimeConstraint.time_time_constraint(3, 'FF')                                           |
|          | 13.9±0.07ms          | 13.9±0.09ms         |    1    | load.TimeConstraint.time_time_constraint(3, 'NetCDF')                                       |
|          | 28.2±0.3ms           | 27.5±0.2ms          |    0.98 | load.TimeConstraint.time_time_constraint(3, 'PP')                                           |
|          | 18.7±0.3ms           | 18.1±0.1ms          |    0.96 | load.ugrid.BasicLoading.time_load_file(1)                                                   |
|          | 48.7±0.9ms           | 47.0±0.6ms          |    0.97 | load.ugrid.BasicLoading.time_load_file(200000)                                              |
|          | 9.20±0.1ms           | 8.88±0.1ms          |    0.97 | load.ugrid.BasicLoading.time_load_mesh(1)                                                   |
|          | 16.0±0.3ms           | 15.7±0.5ms          |    0.98 | load.ugrid.BasicLoading.time_load_mesh(200000)                                              |
|          | 18.6±0.2ms           | 18.0±0.1ms          |    0.97 | load.ugrid.BasicLoadingTime.time_load_file(1)                                               |
|          | 18.5±0.5ms           | 18.0±0.2ms          |    0.97 | load.ugrid.BasicLoadingTime.time_load_file(200000)                                          |
|          | 8.98±0.4ms           | 8.94±0.2ms          |    0.99 | load.ugrid.BasicLoadingTime.time_load_mesh(1)                                               |
|          | 12.0±0.6ms           | 11.7±0.3ms          |    0.97 | load.ugrid.BasicLoadingTime.time_load_mesh(200000)                                          |
|          | 20.6±0.2ms           | 20.3±0.4ms          |    0.99 | load.ugrid.Callback.time_load_file_callback(1)                                              |
|          | 58.7±0.7ms           | 59.0±0.4ms          |    1.01 | load.ugrid.Callback.time_load_file_callback(200000)                                         |
|          | 20.5±0.4ms           | 20.5±0.2ms          |    1    | load.ugrid.CallbackTime.time_load_file_callback(1)                                          |
|          | 22.4±0.5ms           | 21.9±0.4ms          |    0.97 | load.ugrid.CallbackTime.time_load_file_callback(200000)                                     |
|          | 3.16±0.07ms          | 3.10±0.03ms         |    0.98 | load.ugrid.DataRealisation.time_realise_data(10000)                                         |
|          | 3.98±0.2ms           | 3.96±0.08ms         |    0.99 | load.ugrid.DataRealisation.time_realise_data(200000)                                        |
|          | 48.1±2ms             | 46.6±0.6ms          |    0.97 | load.ugrid.DataRealisationTime.time_realise_data(10000)                                     |
|          | 1.13±0.02s           | 1.12±0.02s          |    1    | load.ugrid.DataRealisationTime.time_realise_data(200000)                                    |
|          | 1.13±0.01s           | 1.13±0.01s          |    1    | merge_concat.Concatenate.time_concatenate(False)                                            |
|          | 388±20ms             | 391±9ms             |    1.01 | merge_concat.Concatenate.time_concatenate(True)                                             |
|          | 2.43±0.01G           | 2.43±0.01G          |    1    | merge_concat.Concatenate.tracemalloc_concatenate(False)                                     |
|          | 120±2M               | 120±5M              |    1    | merge_concat.Concatenate.tracemalloc_concatenate(True)                                      |
|          | 28.7±2ms             | 26.1±0.2ms          |    0.91 | merge_concat.Merge.time_merge                                                               |
|          | 126±0.03M            | 126±0.03M           |    1    | merge_concat.Merge.tracemalloc_merge                                                        |
|          | 386±3ns              | 384±2ns             |    0.99 | mesh.utils.regions_combine.CombineRegionsComputeRealData.time_compute_data(50)              |
|          | 200±6ms              | 204±3ms             |    1.02 | mesh.utils.regions_combine.CombineRegionsComputeRealData.time_compute_data(500)             |
|          | 771±0.6k             | 771±0.6k            |    1    | mesh.utils.regions_combine.CombineRegionsComputeRealData.tracemalloc_compute_data(50)       |
|          | 60.2±0M              | 60.2±0M             |    1    | mesh.utils.regions_combine.CombineRegionsComputeRealData.tracemalloc_compute_data(500)      |
|          | 17.4±0.07ms          | 17.2±0.1ms          |    0.99 | mesh.utils.regions_combine.CombineRegionsCreateCube.time_create_combined_cube(50)           |
|          | 20.8±0.6ms           | 20.5±0.4ms          |    0.98 | mesh.utils.regions_combine.CombineRegionsCreateCube.time_create_combined_cube(500)          |
|          | 1.23±0M              | 1.24±0M             |    1    | mesh.utils.regions_combine.CombineRegionsCreateCube.tracemalloc_create_combined_cube(50)    |
|          | 25±0.01M             | 25±0M               |    1    | mesh.utils.regions_combine.CombineRegionsCreateCube.tracemalloc_create_combined_cube(500)   |
|          | 98.5±0.9ms           | 98.3±1ms            |    1    | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.time_stream_file2file(50)         |
|          | 418±2ms              | 421±2ms             |    1.01 | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.time_stream_file2file(500)        |
|          | 1.62±0.03M           | 1.62±0.03M          |    1    | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.tracemalloc_stream_file2file(50)  |
|          | 96.7±0.03M           | 96.7±0.02M          |    1    | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.tracemalloc_stream_file2file(500) |
|          | 67.6±0.4ms           | 66.8±1ms            |    0.99 | mesh.utils.regions_combine.CombineRegionsSaveData.time_save(50)                             |
|          | 385±5ms              | 386±3ms             |    1    | mesh.utils.regions_combine.CombineRegionsSaveData.time_save(500)                            |
|          | 1.5±0.03M            | 1.53±0.04M          |    1.01 | mesh.utils.regions_combine.CombineRegionsSaveData.tracemalloc_save(50)                      |
|          | 96.5±0.03M           | 96.5±0.02M          |    1    | mesh.utils.regions_combine.CombineRegionsSaveData.tracemalloc_save(500)                     |
|          | 2.1752849999999997   | 2.1752849999999997  |    1    | mesh.utils.regions_combine.CombineRegionsSaveData.track_filesize_saved(50)                  |
|          | 216.01528499999998   | 216.01528499999998  |    1    | mesh.utils.regions_combine.CombineRegionsSaveData.track_filesize_saved(500)                 |
|          | 6.65±0.1ms           | 6.61±0.03ms         |    0.99 | plot.AuxSort.time_aux_sort                                                                  |
|          | 49.3±0.5ms           | 48.6±0.9ms          |    0.99 | regridding.CurvilinearRegridding.time_regrid_pic                                            |
|          | 136±3M               | 136±3M              |    1    | regridding.CurvilinearRegridding.tracemalloc_regrid_pic                                     |
|          | 101±8ms              | 91.3±7ms            |    0.9  | regridding.HorizontalChunkedRegridding.time_regrid_area_w                                   |
|          | 47.3±0.3ms           | 47.6±0.5ms          |    1.01 | regridding.HorizontalChunkedRegridding.time_regrid_area_w_new_grid                          |
|          | 107±0.3M             | 107±0.1M            |    1    | regridding.HorizontalChunkedRegridding.tracemalloc_regrid_area_w                            |
|          | 147±0.04M            | 147±0.04M           |    1    | regridding.HorizontalChunkedRegridding.tracemalloc_regrid_area_w_new_grid                   |
|          | 4.57±0.04ms          | 4.55±0.06ms         |    1    | save.NetcdfSave.time_netcdf_save_cube(50, False)                                            |
|          | 72.0±0.7ms           | 71.5±0.8ms          |    0.99 | save.NetcdfSave.time_netcdf_save_cube(50, True)                                             |
|          | 62.3±20ms            | 74.4±20ms           |    1.19 | save.NetcdfSave.time_netcdf_save_cube(600, False)                                           |
|          | 245±2ms              | 247±3ms             |    1.01 | save.NetcdfSave.time_netcdf_save_cube(600, True)                                            |
|          | 99.3±1ns             | 97.4±0.8ns          |    0.98 | save.NetcdfSave.time_netcdf_save_mesh(50, False)                                            |
|          | 53.6±0.5ms           | 53.5±0.3ms          |    1    | save.NetcdfSave.time_netcdf_save_mesh(50, True)                                             |
|          | 98.9±1ns             | 97.8±1ns            |    0.99 | save.NetcdfSave.time_netcdf_save_mesh(600, False)                                           |
|          | 215±3ms              | 214±2ms             |    1    | save.NetcdfSave.time_netcdf_save_mesh(600, True)                                            |
|          | 30.6±0.4k            | 30.6±0.3k           |    1    | save.NetcdfSave.tracemalloc_netcdf_save(50, False)                                          |
|          | 1.87±0.1M            | 1.93±0.1M           |    1.03 | save.NetcdfSave.tracemalloc_netcdf_save(50, True)                                           |
|          | 30.6±0.5k            | 30.5±0.3k           |    1    | save.NetcdfSave.tracemalloc_netcdf_save(600, False)                                         |
|          | 191±20M              | 191±20M             |    1    | save.NetcdfSave.tracemalloc_netcdf_save(600, True)                                          |
|          | 36.5±0.5ms           | 36.4±0.7ms          |    1    | stats.PearsonR.time_lazy                                                                    |
|          | 8.45±0.1ms           | 8.33±0.2ms          |    0.99 | stats.PearsonR.time_real                                                                    |
|          | 30.6±2M              | 30.6±0.6M           |    1    | stats.PearsonR.tracemalloc_lazy                                                             |
|          | 18.3±0M              | 18.3±0M             |    1    | stats.PearsonR.tracemalloc_real                                                             |
|          | 21.3±0.09ms          | 21.1±0.2ms          |    0.99 | trajectory.TrajectoryInterpolation.time_trajectory_linear                                   |
|          | 55.9±3ms             | 56.0±5ms            |    1    | trajectory.TrajectoryInterpolation.time_trajectory_nearest                                  |
|          | 17.6±0.04M           | 17.6±0.04M          |    1    | trajectory.TrajectoryInterpolation.tracemalloc_trajectory_linear                            |
|          | 7.77±0.05M           | 7.77±0.05M          |    1    | trajectory.TrajectoryInterpolation.tracemalloc_trajectory_nearest                           |

Generated by GHA run 25849493620

@trexfeathers
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Benchmarks drift by 1-2% between each run, which is why there is a concept of 'significant' changes. But it's worth noting that all the PP benchmarks drifted in the 'correct' direction, so there has probably been a small impact, in a good way.

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codecov Bot commented May 14, 2026

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.12%. Comparing base (3f1aa5d) to head (f0e6954).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files
@@           Coverage Diff           @@
##             main    #7089   +/-   ##
=======================================
  Coverage   90.12%   90.12%           
=======================================
  Files          91       91           
  Lines       24951    24953    +2     
  Branches     4683     4683           
=======================================
+ Hits        22488    22490    +2     
  Misses       1684     1684           
  Partials      779      779           

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