diff --git a/apps/readest-app/src/app/library/hooks/useBooksSync.ts b/apps/readest-app/src/app/library/hooks/useBooksSync.ts
index 64027a17..62b4daeb 100644
--- a/apps/readest-app/src/app/library/hooks/useBooksSync.ts
+++ b/apps/readest-app/src/app/library/hooks/useBooksSync.ts
@@ -6,11 +6,13 @@ import { useAuth } from '@/context/AuthContext';
 import { useLibraryStore } from '@/store/libraryStore';
 import { SYNC_BOOKS_INTERVAL_SEC } from '@/services/constants';
 import { throttle } from '@/utils/throttle';
+import { debounce } from '@/utils/debounce';
 
 export const useBooksSync = () => {
   const { user } = useAuth();
   const { appService } = useEnv();
-  const { library, isSyncing, setLibrary, setIsSyncing, setSyncProgress } = useLibraryStore();
+  const { library, isSyncing, libraryLoaded } = useLibraryStore();
+  const { setLibrary, setIsSyncing, setSyncProgress } = useLibraryStore();
   const { useSyncInited, syncedBooks, syncBooks, lastSyncedAtBooks } = useSync();
   const isPullingRef = useRef(false);
 
@@ -37,11 +39,12 @@ export const useBooksSync = () => {
     }
     try {
       isPullingRef.current = true;
-      await syncBooks([], 'pull');
+      const library = useLibraryStore.getState().library;
+      await syncBooks([], 'pull', libraryLoaded && library.length === 0 ? 0 : undefined);
     } finally {
       isPullingRef.current = false;
     }
-  }, [user, syncBooks]);
+  }, [user, libraryLoaded, syncBooks]);
 
   // eslint-disable-next-line react-hooks/exhaustive-deps
   const handleAutoSync = useCallback(
@@ -75,12 +78,11 @@ export const useBooksSync = () => {
   }, [user, syncBooks, getNewBooks]);
 
   useEffect(() => {
-    if (!user || !useSyncInited) return;
+    if (!user || !useSyncInited || !libraryLoaded) return;
     pullLibrary();
-  }, [user, useSyncInited, pullLibrary]);
+  }, [user, useSyncInited, libraryLoaded, pullLibrary]);
 
-  const updateLibrary = async () => {
-    if (isSyncing) return;
+  const updateLibrary = useCallback(async () => {
     if (!syncedBooks?.length) return;
 
     // Process old books first so that when we update the library the order is preserved
@@ -149,12 +151,23 @@ export const useBooksSync = () => {
         setIsSyncing(false);
       }
     }
-  };
-
-  useEffect(() => {
-    updateLibrary();
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [syncedBooks]);
 
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  const debouncedUpdateLibrary = useCallback(
+    debounce(() => updateLibrary(), 10000),
+    [updateLibrary],
+  );
+
+  useEffect(() => {
+    if (isSyncing) {
+      debouncedUpdateLibrary();
+    } else {
+      updateLibrary();
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [syncedBooks, updateLibrary, debouncedUpdateLibrary]);
+
   return { pullLibrary, pushLibrary };
 };
diff --git a/apps/readest-app/src/hooks/useSync.ts b/apps/readest-app/src/hooks/useSync.ts
index c1158d3f..a7eae8e3 100644
--- a/apps/readest-app/src/hooks/useSync.ts
+++ b/apps/readest-app/src/hooks/useSync.ts
@@ -1,5 +1,6 @@
 import { useCallback, useEffect, useState } from 'react';
 import { useRouter } from 'next/navigation';
+import { useEnv } from '@/context/EnvContext';
 import { useSyncContext } from '@/context/SyncContext';
 import { SyncData, SyncOp, SyncResult, SyncType } from '@/libs/sync';
 import { useSettingsStore } from '@/store/settingsStore';
@@ -36,7 +37,8 @@ const computeMaxTimestamp = (records: BookDataRecord[]): number => {
 const ONE_DAY_IN_MS = 24 * 60 * 60 * 1000;
 export function useSync(bookKey?: string) {
   const router = useRouter();
-  const { settings, setSettings } = useSettingsStore();
+  const { envConfig } = useEnv();
+  const { settings, setSettings, saveSettings } = useSettingsStore();
   const { getConfig, setConfig } = useBookDataStore();
   const { setIsSyncing } = useReaderStore();
   const config = bookKey ? getConfig(bookKey) : null;
@@ -152,6 +154,7 @@ export function useSync(bookKey?: string) {
       }
     } finally {
       setSyncing(false);
+      saveSettings(envConfig, settings);
     }
   };
 
@@ -175,13 +178,18 @@ export function useSync(bookKey?: string) {
   };
 
   const syncBooks = useCallback(
-    async (books?: Book[], op: SyncOp = 'both') => {
+    async (books?: Book[], op: SyncOp = 'both', since?: number) => {
       if (!lastSyncedAtInited) return;
       if ((op === 'push' || op === 'both') && books?.length) {
         await pushChanges({ books });
       }
       if (op === 'pull' || op === 'both') {
-        await pullChanges('books', lastSyncedAtBooks + 1, setLastSyncedAtBooks, setSyncingBooks);
+        await pullChanges(
+          'books',
+          since ?? lastSyncedAtBooks + 1,
+          setLastSyncedAtBooks,
+          setSyncingBooks,
+        );
       }
     },
     // eslint-disable-next-line react-hooks/exhaustive-deps
diff --git a/apps/readest-app/src/store/libraryStore.ts b/apps/readest-app/src/store/libraryStore.ts
index 1a8e98cd..d053851c 100644
--- a/apps/readest-app/src/store/libraryStore.ts
+++ b/apps/readest-app/src/store/libraryStore.ts
@@ -6,6 +6,7 @@ import { md5Fingerprint } from '@/utils/md5';
 
 interface LibraryState {
   library: Book[]; // might contain deleted books
+  libraryLoaded: boolean;
   isSyncing: boolean;
   syncProgress: number;
   checkOpenWithBooks: boolean;
@@ -36,6 +37,7 @@ interface LibraryState {
 
 export const useLibraryStore = create<LibraryState>((set, get) => ({
   library: [],
+  libraryLoaded: false,
   isSyncing: false,
   syncProgress: 0,
   currentBookshelf: [],
@@ -56,7 +58,7 @@ export const useLibraryStore = create<LibraryState>((set, get) => ({
   setCheckLastOpenBooks: (check) => set({ checkLastOpenBooks: check }),
   setLibrary: (books) => {
     const { refreshGroups } = get();
-    set({ library: books });
+    set({ library: books, libraryLoaded: true });
     refreshGroups();
   },
   updateBook: async (envConfig: EnvConfigType, book: Book) => {