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## Summary The channel page ran `formatTimeline` on every build. The page also rebuilds for changes unrelated to messages: read state, presence, the roster, keyboard and layout. `formatTimeline` walks every loaded event and JSON-decodes each system row. In #4things (1,235 members, mostly join rows), on a 12 mini Profile build: - 58 ms of main thread over 21 idle seconds. - About 11 ms per frame while the keyboard animated. The messages notifiers publish a new list for every event change, so this memoizes the result on that list, the current pubkey, and the forum flag. `buildMainTimelineEntries` and the relay thread summaries it reads stay outside the memo. A summary-only update that republishes the same list still shows up. ### Related issue None found. ### Testing - Updated `loading_review_tests.dart`: unrelated page rebuilds now format the timeline 0 times, where main formats once per rebuild (the test fails on main). A new live event formats exactly once, and its message appears. - `just mobile-install mobile-check mobile-test` passes. - Device (12 mini, Profile build with this change, #4things idle). Runs are not matched, so this shows the mechanism, not a controlled speedup. - Before: 58 ms over 21 s. - After: 7 ms over 18 s, all from real event changes. - An independent agent review found no defects. It checked that `formatTimeline` reads only its arguments, that every publish path creates a new list or republishes unchanged events, and that nothing downstream mutates the shared result. Not covered: a human test (waived under the mobile testing exception; this was an agent-driven device run), and Android. 🤖 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>