Update scripts/breaking_changes_checker/tests/test_performance.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: msyyc

scripts/breaking_changes_checker/tests/test_performance.py

@@ -207,7 +207,9 @@ def test_full_checker_run_large_unchanged_api(self):
         """Benchmark a full checker run with a large unchanged API surface.
         
         When stable and current are identical, jsondiff produces an empty diff,
-        so the checker should complete almost instantly regardless of API surface size.
+        so diff-based checks do minimal work. However, run_checks() still executes
+        checks like parameter ordering across the full API surface. This test
+        ensures the overall run remains fast and bounded even for a large, unchanged API.
         """
         stable, current = _generate_large_stable_current(
             num_modules=10,