mirror of
https://github.com/block/buzz.git
synced 2026-11-04 16:31:38 +00:00
0e5a69962e
## Summary `VerifiedProfilesNotifier.track` trims its interest map to 1,024 subjects, but it finds the oldest subject by scanning every entry, once per eviction. Opening #announcements (4,302 members) evicts about 3,300 subjects, which is roughly 3.4 million comparisons. On a 12 mini Profile build that was 316 ms of main thread, inside the channel's 134 to 167 ms opening frames. It runs whether or not the relay serves verified profiles, so it also affects the prod Block community. A subject's interest is set once, on insertion (`??=`), so the map's insertion order is interest order. The oldest subject is therefore `keys.first`, and eviction is constant time. Which subjects are kept does not change. ### Related issue None found. ### Testing - New `verified_profile_directory_test.dart` case: tracking 4,300 subjects keeps exactly the 1,024 most recently tracked ones, and tracking a subject again does not refresh its age. This test checks that behavior is preserved, and it passes on main too. The speedup comes from removing the per-eviction scan, which the device CPU profile attributed. - `just mobile-check` passes. `flutter test test/shared/verified_profiles/` passes (30 tests). The pre-push hook ran the mobile unit tests. - Device (12 mini, Profile build, opening #announcements, first 5 s; runs not matched): `VerifiedProfilesNotifier.track` inclusive CPU 316 ms before, 14 ms after. Opening frames of 134 to 141 ms remain, mostly the channel name scope (follow-up). Not covered: a human test (waived under the mobile testing exception), Android. Separately, the 1,024 cap still churns subscriptions for rosters larger than that. This PR doesn't change that design. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Signed-off-by: Tom Brow <tomb@squareup.com> Co-authored-by: Tom Brow <tomb@squareup.com> Co-authored-by: studio <dc2fc481343672df31a689840c09299972e704dac592e0da6f18486646a7ee3e@buzz.block.builderlab.xyz> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>