fix(app): 78x faster Home cold loading#36214
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Pull request overview
This PR improves the Home page cold-load path by switching session history loading to a single V2 “global” snapshot (with SSE replay) and by keeping per-directory child stores’ heavier queries dormant until a directory is actually opened, while preserving the existing V1 per-directory loader as a fallback.
Changes:
- Load Home sessions via one guarded V2
session.listsnapshot and replaysession.*SSE events over it, with a V1 directory-loader fallback on error. - Avoid bootstrapping per-directory queries (path/providers/LSP/references) for passive directory reads until a real directory access.
- Update related sync plumbing and add focused tests for snapshot parsing/retention and child-store passivity.
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| packages/app/src/pages/home.tsx | Switch Home to V2 snapshot query + SSE replay and keep V1 directory loader as fallback. |
| packages/app/src/pages/home-session-snapshot.ts | Add snapshot parsing/retention + SSE event application helpers for Home’s V2 adapter. |
| packages/app/src/pages/home-session-snapshot.test.ts | Add tests for snapshot loading, validation/guarding, retention, and event replay. |
| packages/app/src/context/server-sync.tsx | Gate directory refresh and LSP/reference prefetch behind “queries enabled” checks. |
| packages/app/src/context/global-sync/child-store.ts | Add query enable toggles so passive child creation doesn’t start heavy queries until bootstrapped. |
| packages/app/src/context/global-sync/child-store.test.ts | Add regression test ensuring non-bootstrapping children remain passive until real access. |
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| setSessionEvents( | ||
| produce((draft) => { | ||
| const list = (draft[key] ??= []) | ||
| list.push(event) | ||
| }), | ||
| ) |
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| export function retainHomeSessions(sessions: Session[], limit: number, now: number) { | ||
| const grouped = Map.groupBy(sessions, (session) => pathKey(session.directory)) | ||
| return [...grouped.values()].flatMap((items) => trimSessions(items, { limit, permission: {}, now })) | ||
| } |
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TLDR;
Changelog
Improved
Implementation
Benchmark
Real Beta desktop data: 123 projects, 4,096 session rows, three restored tabs.
Validation