useProgressAutoSave fires saveConfig ~once per second of reading. Two
write-time sources were doubling its IPC cost:
1. saveConfig wrote the WHOLE library.json (+ backup) on every call, so a
user with N books paid 2*JSON.stringify(N) per save. Chrome DevTools'
Bottom-Up profile on a release Android build showed processIpcMessage
chewing ~25% of main-thread time during a reading session.
2. nativeFileSystem.writeFile / copyFile defensively called plugin:fs|exists
before every write to ensure the parent dir existed. Same dir gets
probed once per save -- ~50% of IPC time per save was just exists()
round-trips against directories that have been there since the book
was opened.
Fix:
- LIBRARY_SAVE_THROTTLE_MS=30s coalesces a swipe burst into a single
library.json write. Per-book config.json is still written eagerly --
it's the sync source-of-truth and is small. flushPendingLibrarySave()
is called on hook unmount + window blur so closing the book always
flushes.
- In-process knownExistingDirs Set caches verified directories per app
session. createDir adds, removeDir (incl. recursive) clears. Cold
start still does the original exists+createDir dance once per dir.
saveConfig refreshed config.updatedAt by mutating the config object in
place. That only worked because every reader view shares one config
object reference, and it bypassed Zustand change-detection entirely.
Refresh updatedAt via an immutable setConfig store update instead, so it
no longer depends on callers sharing the same reference, notifies
subscribers, and never mutates the caller-provided object. Sync behavior
is unchanged.
Refs #4184
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* perf(store): decouple page turn from full library rewrite for large collections
Previously every page turn triggered setLibrary() which copied the entire
library array, ran refreshGroups() with MD5 hashing over all books, and
caused cascading re-renders. With ~2800 books this made reading unusable.
- Add hash-indexed Map to libraryStore for O(1) book lookups
- Add lightweight updateBookProgress() that skips array copy and refreshGroups
- Use hash index in setProgress, saveConfig, and initViewState
- Batch cover URL generation with concurrency limit on library load
Addresses #3714
* perf(import): replace filter()[0] with find() to short-circuit on first match
* fix(store): replace Object.assign state mutation with immutable spread in setConfig
* perf(persistence): remove JSON pretty-printing to reduce serialization overhead
* fix(reader): stabilize debounce reference in useIframeEvents to prevent timer reset on re-render
* perf(context): memoize provider values to prevent unnecessary consumer re-renders
* perf(store): cache visible library to avoid refiltering on every access
* perf(library): remove redundant refreshGroups call already triggered by setLibrary
* perf(import): replace O(n) splice(0,0) with O(1) push for new book insertion
* perf(import): defer library persistence to end of import batch instead of every 4 books
* perf(library): skip full library reload on reader close since store is already in sync
* fix: address PR review feedback for library perf optimizations
Correctness fixes for issues found in code review:
- fix(library): restore library reload on close-reader-window. Reader
windows are independent Tauri webviews with their own libraryStore
instance, so progress / readingStatus / move-to-front updates from
the reader do not propagate to the main window. Reload from disk
so the library reflects the changes the reader just persisted.
- perf(import): wire BookLookupIndex into importBooks. The lookupIndex
parameter on bookService.importBook had no caller, leaving the
Map-based dedup path dead. Build the index once per import batch
in app/library/page.tsx and thread it through appService.importBook
so the O(1) dedup path is actually exercised.
- perf(import): defer library save to end of batch. Add a skipSave
option to libraryStore.updateBooks and call appService.saveLibraryBooks
once after the entire import loop, instead of once per concurrency-4
sub-batch.
- fix(store): make updateBookProgress immutable. The previous in-place
mutation reused the same library array reference, bypassing Zustand
change detection AND leaving the visibleLibrary cache holding stale
Book references. Now slice the array, update the entry, and refresh
visibleLibrary. Also make readingStatus a required parameter so
future callers cannot accidentally clear it by omitting the argument.
- fix(store): make saveConfig immutable. It previously mutated the Book
object's progress / timestamps in place and used splice/unshift on
the shared library array. Now spread to a new book object and rebuild
via setLibrary. Also corrects the interface signature to return
Promise<void> (the implementation was already async).
- fix(store): make updateBook immutable for the same reason — it was
mutating the previous-state library array before spreading.
- fix(context): wrap AuthContext login/logout/refresh in useCallback.
Without this, the useMemo deps array changed every render and the
memo was a no-op, defeating the optimization the PR was trying to
add.
- fix(reader): use a ref for handlePageFlip in useMouseEvent's debounce.
The empty-deps useMemo froze the first-render handler; with the ref
the debounced wrapper always invokes the latest closure.
Test coverage added:
- library-store: immutable updateBookProgress, visibleLibrary cache
refresh, deleted-book filtering, updateBooks skipSave option
- book-data-store: immutable saveConfig, move-to-front correctness,
visibleLibrary order, persistence behavior
- import-metahash: BookLookupIndex update on new import, lookup-index
consultation before scanning books array
- auth-context (new file): context value identity stability across
re-renders, callback identity stability
- useIframeEvents (new file): debounced wheel handler dispatches to
the latest handlePageFlip after re-render
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* refactor(types): move BookLookupIndex to types/book.ts
Avoids the inline `import('@/services/bookService').BookLookupIndex`
type annotation in types/system.ts. Both the AppService interface and
the bookService implementation now import BookLookupIndex from the
canonical location alongside Book.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* refactor(import): convert importBook params to options object
Replace the long positional-argument list on appService.importBook
(saveBook, saveCover, overwrite, transient, lookupIndex) with a
single options object so callers no longer need to pad with
`undefined, undefined, undefined, undefined` to reach the parameter
they actually want to set.
Before:
await appService.importBook(file, library, undefined, undefined,
undefined, undefined, lookupIndex);
After:
await appService.importBook(file, library, { lookupIndex });
The underlying bookService.importBook is also refactored to take an
options object: required AppService callbacks (saveBookConfig,
generateCoverImageUrl) are bundled with the optional flags via an
ImportBookInternalOptions interface that extends the public
ImportBookOptions defined in types/book.ts.
All existing call sites updated to the new shape.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Huang Xin <chrox.huang@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* sync: update partial config to sync more actively
* rtl: make the order of go back/forward buttons consistent
* fix: wheel events conflict with touchpad scroll on macOS
* release: hot fix version 0.9.21
* Add missing translation for progress synced toast
* Graceful shutdown after all books closed, closes#50
* Throttle app update check to once every day
* Avoid infinite loop to redirect to the login page, closes#54
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