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Home's DM sort resolves participant identity names again for every comparator call. This work appeared in a captured 82.163 ms UI frame after foregrounding the full app (Debug/JIT iOS simulator, shared host). Resolve each lowercase display label once per sort, retaining the same label ordering and channel-ID tie-breaker. Sort keys are invocation-local, so later viewer, profile, owner, participant, and community changes cannot reuse stale labels. No matching open mobile sorting PR or issue found. ### Validation - Added synthetic regression coverage for bounded contextual resolution and ordering parity across identity/name/channel changes, ties, unnamed DMs, and empty/singleton lists. The 80-DM fixture performs 80 contextual resolutions instead of the original comparator’s 982; restoring that comparator makes the regression fail. - 133 focused tests passed, including existing Home scrolling/reconnect widget tests and identity-name tests. - Mobile static analysis passed; 3,697 tests passed with 16 existing skips, plus four no-gateway configuration tests. - No new full-app or hardware capture. The existing trace establishes repeated synchronous work, not its release-build magnitude or the cause of every scrolling stall. Signed-off-by: Tom Brow <tomb@block.xyz>