Outside the editor the UI did background work on every tree event, socket
reconnect, and navigation. Tree infra (virtualization/memo/O(N) utils) was
already good — the cost was in the subscriptions and duplicates around it.
Client-only; behavior 1:1.
- Setter-only atom subscriptions → useSetAtom: space-tree-row, use-tree-mutation,
use-tree-socket no longer subscribe every visible row to the WHOLE treeDataAtom
value (a tree event re-rendered all ~20-30 rows, bypassing the DocTreeRow memo).
space-tree-node-menu / mention-list read the tree imperatively (store.get) in
their handlers only. breadcrumb.tsx uses a selectAtom slice (ancestor chain +
field equality) instead of the whole-tree subscription.
- Socket handler cleanup (BUG): use-tree-socket + use-query-subscription now
socket.off() their named handlers on cleanup (were accumulating listeners on
every reconnect → duplicated invalidations/tree-walks). Mirrors
use-notification-socket.
- Field-update tree path: invalidateOnUpdatePage does a pointwise patch of the
cached embed subtrees instead of a blanket invalidatePageTree() (refetch storm);
structural events keep the blanket invalidate.
- usePageMetaQuery: a content-less select slice for the 13 peripheral subscribers
that read only title/permissions/id, so they stop re-rendering every ~3s while
typing / on every collab page.updated (page.tsx keeps the full query for content).
- page.tsx: skeleton + placeholderData keepPreviousData (no blank flash on nav).
- Removed refetchOnMount:true where socket/mutation invalidation already keeps the
cache fresh (favorite/space/space-watcher/workspace). KEPT it on the 3 queries
with NO other freshness path (trash-list, created-by, recent-changes) — the
global default is refetchOnMount:false, so those overrides are load-bearing.
- Small: resize mousemove/up attached only while dragging; per-row emoji-picker
keydown gated on `opened`; AiChatWindow queries enabled only when the window is
open.
Gate: client tsc 0, client vitest page+websocket 200 passed (+editor suites),
build ok.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
agent_coder
Philip Okugbe