perf: reduce iterations in the fast path for the keyer composer updates #3289

Job	Run time
Build samples	26s
Verify build-browser (ubuntu-latest)	49s
Print commit stats	1m 2s
Verify build-browser (macos-26)	45s
Build	4m 39s
Verify build-browser (windows-latest)	3m 11s
Type definitions test	2m 5s
Unit test	3m 21s
Static code analysis	3m 48s
HTML test (12/17)	7m 23s
HTML test (3/17)	7m 32s
HTML test (8/17)	7m 21s
HTML test (4/17)	7m 37s
HTML test (2/17)	7m 40s
HTML test (5/17)	7m 56s
HTML test (10/17)	7m 42s
HTML test (9/17)	8m 19s
HTML test (15/17)	7m 25s
HTML test (14/17)	7m 51s
HTML test (11/17)	7m 35s
HTML test (17/17)	7m 22s
HTML test (6/17)	7m 52s
HTML test (7/17)	7m 29s
HTML test (1/17)	7m 18s
HTML test (16/17)	7m 47s
HTML test (13/17)	7m 41s
Merge test snapshots	4s
Merge test results	31s
Verify build-browser (macos-26)	45s
Build samples	26s
Print commit stats	1m 2s
Build	4m 39s
Verify build-browser (windows-latest)	3m 11s
Verify build-browser (ubuntu-latest)	49s
Static code analysis	3m 48s
Type definitions test	2m 5s
HTML test (5/17)	7m 56s
HTML test (7/17)	7m 29s
HTML test (6/17)	7m 52s
HTML test (2/17)	7m 40s
HTML test (8/17)	7m 21s
HTML test (3/17)	7m 32s
HTML test (12/17)	7m 23s
HTML test (4/17)	7m 37s
Unit test	3m 21s
HTML test (11/17)	7m 35s
HTML test (9/17)	8m 19s
HTML test (1/17)	7m 11s
HTML test (14/17)	7m 51s
HTML test (10/17)	7m 42s
HTML test (13/17)	7m 41s
HTML test (16/17)	7m 47s
HTML test (15/17)	7m 25s
HTML test (17/17)	7m 22s
Merge test snapshots	4s
Merge test results	18s
	5h 0m 42s

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