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On iOS, Buzz stores verified profile and channel information for the notification extension. The extension uses this cache to show sender and channel names. Loading profiles or channels also updates the cache. Cache updates currently check event signatures on the UI thread, even when the caller does not wait for the update. This can delay taps and screen updates. This change moves those checks to a background worker. Signature checks, event selection, community boundaries, and the order of native writes are preserved. The worker accepts up to eight batches. When it is busy, later profile requests stay coalesced before fetching; profiles already loaded remain available immediately. Overlapping channel updates trigger a fresh joined-channel cache snapshot after the current export finishes, without delaying or restarting the channel screen. Queue saturation gets up to five retries per operation. Pending updates get their own recovery attempt even if the preceding export fails. Recovery fetches joined-channel data once and retries cache admission without repeating relay reads. It does not fetch the open-channel directory. Verified payloads are split into native-sized writes (256 profiles or 512 paired channels), keeping the same export ordering. Native profile/channel write failures retry the same verified chunk while retaining the export's queue position. All chunks share five retries with 7.75 seconds total backoff; other native errors fail immediately. Terminal failures are recorded, and later successful writes do not hide them. Captured batches keep their original community. Pending channel refetches are retired on a community switch and refreshed when the user returns. The cache remains best effort; prolonged failures can still prevent delivery. Tests through the production APIs reduced UI delay from 27–31 ms to below 0.3 ms for four profiles, and from 59–60 ms to below 0.3 ms for four channel and membership pairs. The native payloads were identical. This does not measure overall screen speed. Validation: 2,225 mobile tests passed (one skipped), along with 18 focused export tests, 12 recovery tests, 39 native Swift tests, 35 focused profile tests, and static analysis. Production regressions cover 13-entity bursts, invalid newer events, community rebuilds, reentrant refreshes, and terminal failures. Regression tests fail when producer recovery controls, terminal-failure draining, or member-only recovery scope are removed. --------- Signed-off-by: Tom Brow <tomb@block.xyz>