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a96ace4e55
Ordinary mobile messages eagerly built a set of every community emoji shortcode and segmented their entire body just to decide whether to use enlarged emoji rendering. Stop at the first non-emoji grapheme and build the shortcode set only when a complete shortcode is encountered. Emoji-only sizing and shortcode matching stay unchanged. ### Validation - Full `just ci` passed. - 125 focused detector and message-rendering tests pass; targeted analysis is clean. The palette-access regression fails on the original implementation (10,320 unnecessary reads) and passes with the fix. It also checks that consecutive shortcodes share one palette scan. - **Full Buzz app, real community data, debug/JIT iOS simulator, not a rendering fixture:** two paired actual-input captures measured 125–127 µs per original detector call versus under 1 µs with the fix. All 5,200 executions per version agreed across 260 observed prose calls and a 2,580-entry palette. Instrumentation repeated each detector call, so these captures are excluded from frame comparisons. - Separate clean-code scrolling runs do **not** establish a reliable smoothness improvement: quiet original UI-callback p95 was 10.1–12.6 ms versus 10.1–12.9 ms fixed. A busy fixed run still reached 90.8 ms. Normal app services stayed enabled; only scrolling was exercised. Live background refresh, debug mode, host scheduling, and profiler overhead limit interpretation. No physical-device/release-AOT or end-to-end interaction-latency claim. Signed-off-by: Tom Brow <tomb@block.xyz>