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## Summary Every identity-name source change (a profile batch, a verified name) rebuilds a channel's naming scope over its whole member list. In a 4,000-member channel, each rebuild derived every key's naming fact more than once: owner loading and resolution each derived it, and so did each label for a key outside the scope. It also checked every key against a regular expression several times, and iOS AOT builds run regular expressions in an interpreter. - `IdentityNames` derives each key's naming fact once per scope. - `isHexPubkey`: a character-loop hex check, used by the identity-name code instead of the regular expressions. Labels are unchanged. ## Measurements These were taken with an earlier version of this PR that also cached npub encoding. That cache was removed to keep the change small, so the remaining gain is smaller than shown. I haven't re-measured it. - **Synthetic** (Mac, `flutter test`, 4,391 members, 60% with profiles; scope, `missingOwnerProfiles` and every label for each new sources object): a warm rebuild took 63 ms before and 12 ms with the cache. The first rebuild took 120 ms before and 91 ms with the cache. - **Device** (iPhone 12 mini, Profile build, first 5 s after opening #announcements with 4,391 members; runs not matched): `channelIdentityNamesProvider` plus `watchChannelIdentityLabel` inclusive CPU was 148 ms before and 81 ms with the cache. Of that, `fullNpub` (npub encoding, the cached part) went from 62 ms to 22 ms. The identity path no longer calls `RegExp.hasMatch`. ## Testing - A new test counts profile lookups. Owner loading, every label and an outside key read each member's profile once. Without the memo, each is read 3 times. - New `isHexPubkey` tests cover both cases, wrong lengths, characters just outside each range, and a bad character at every position. - `just mobile-check mobile-test` passes. 🤖 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>