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Switching channels triggered a full-roster fetch (kind:39002 plus a kind:0 profile batch with every member pubkey as an author) in the common case, and several render paths walked the full roster per render. None of this scales past a few hundred members; the product target is 10k+. - **Members query staleTime 30s → 5min.** Every membership change the client can observe already invalidates the key explicitly: live join/leave system messages for the active channel, member-added/removed notifications for the current identity, and all membership mutations — including previously-uncovered direct write paths (moderation kick, agent-deletion cleanup), which now invalidate through a shared helper. The 30s window bought correctness we already had and charged a roster fetch per switch. - **ChannelMembersBar no longer mounts the roster query for non-DM channels** — the count renders from the channel summary, and the private-channel huddle gate accepts `channel.isMember` (derived from the same kind:39002 event as the roster's self entry). - **Roster-derived lookups are cached on roster identity** (`rosterDerivations.ts`): role map, agent-member subset, member/bot pubkey sets. These were rebuilt O(members) on every live message / profile re-key. React Query's structural sharing keeps the roster identity stable, so each derivation computes once per distinct roster. - **Backend: the kind:0 profile join in `get_channel_members` is capped at the first 500 members** (roster order). Members past the cap keep `display_name: None` (UI falls back to pubkey labels and profile caches); `role=="bot"` agent flags are roster-derived and unaffected. Full roster pagination is the structural follow-up. - **Composer keystroke path**: `useCanAddChannelMembers` re-scanned channels + roster per keystroke; now memoized on data identities, sharing the cached pubkey set. ### Measured / estimated impact | metric | before | after | |---|---|---| | roster fetches while switching (live trace) | nearly every switch | ≤1 per channel per 5 min | | roster fetch cost on the wire (live, 51-member channel) | 273ms per fetch | amortized away | | kind:0 `authors` filter size at 10k members | ~670KB per request (~67 B/pubkey) | capped at 500 authors (~34KB) | | warm-switch longtask at 10k members (mock harness, 4× throttle) | 364ms | 318ms | | per-render roster walks (role map, agent sets) at 10k members | O(members) per live message | once per distinct roster | Deferred deliberately: protocol-level roster pagination and removing `memberPubkeys` from channel summaries (needs relay support). --------- Signed-off-by: Max Lampert <maxwell@squareup.com>