diff --git a/src/public/app/services/note_autocomplete.ts b/src/public/app/services/note_autocomplete.ts
index ca9894b1f..ae2522e18 100644
--- a/src/public/app/services/note_autocomplete.ts
+++ b/src/public/app/services/note_autocomplete.ts
@@ -1,6 +1,5 @@
 import server from "./server.js";
 import appContext from "../components/app_context.js";
-import utils from "./utils.js";
 import noteCreateService from "./note_create.js";
 import froca from "./froca.js";
 import { t } from "./i18n.js";
@@ -10,6 +9,18 @@ const SELECTED_NOTE_PATH_KEY = "data-note-path";
 
 const SELECTED_EXTERNAL_LINK_KEY = "data-external-link";
 
+// To prevent search lag when there are a large number of notes, set a delay based on the number of notes to avoid jitter.
+const notesCount = await server.get<number>(`autocomplete/notesCount`);
+let debounceTimeoutId: ReturnType<typeof setTimeout>;
+
+function getSearchDelay(notesCount: number): number {
+    const maxNotes = 20000;
+    const maxDelay = 1000;
+    const delay = Math.min(maxDelay, (notesCount / maxNotes) * maxDelay);
+    return delay;
+}
+let searchDelay = getSearchDelay(notesCount);
+
 export interface Suggestion {
     noteTitle?: string;
     externalLink?: string;
@@ -72,10 +83,9 @@ async function autocompleteSource(term: string, cb: (rows: Suggestion[]) => void
     const activeNoteId = appContext.tabManager.getActiveContextNoteId();
     const length = term.trim().length;
 
-    let results: Suggestion[] = [];
-    if (length >= 3) {
-        results = await server.get<Suggestion[]>(`autocomplete?query=${encodeURIComponent(term)}&activeNoteId=${activeNoteId}&fastSearch=${fastSearch}`);
-    }
+    let results = await server.get<Suggestion[]>(`autocomplete?query=${encodeURIComponent(term)}&activeNoteId=${activeNoteId}&fastSearch=${fastSearch}`);
+
+    options.fastSearch = true;
 
     if (length >= 1 && options.allowCreatingNotes) {
         results = [
@@ -112,6 +122,7 @@ async function autocompleteSource(term: string, cb: (rows: Suggestion[]) => void
 }
 
 function clearText($el: JQuery<HTMLElement>) {
+    searchDelay = 0;
     $el.setSelectedNotePath("");
     $el.autocomplete("val", "").trigger("change");
 }
@@ -122,6 +133,7 @@ function setText($el: JQuery<HTMLElement>, text: string) {
 }
 
 function showRecentNotes($el: JQuery<HTMLElement>) {
+    searchDelay = 0;
     $el.setSelectedNotePath("");
     $el.autocomplete("val", "");
     $el.autocomplete("open");
@@ -137,11 +149,8 @@ function fullTextSearch($el: JQuery<HTMLElement>, options: Options) {
     options.fastSearch = false;
     $el.autocomplete("val", "");
     $el.setSelectedNotePath("");
+    searchDelay = 0;
     $el.autocomplete("val", searchString);
-    // Set a delay to avoid resetting to true before full text search (await server.get) is called.
-    setTimeout(() => {
-        options.fastSearch = true;
-    }, 100);
 }
 
 function initNoteAutocomplete($el: JQuery<HTMLElement>, options?: Options) {
@@ -154,6 +163,15 @@ function initNoteAutocomplete($el: JQuery<HTMLElement>, options?: Options) {
 
     options = options || {};
 
+    // Used to track whether the user is performing character composition with an input method (such as Chinese Pinyin, Japanese, Korean, etc.) and to avoid triggering a search during the composition process.
+    let isComposingInput = false;
+    $el.on("compositionstart", () => {
+        isComposingInput = true;
+    });
+    $el.on("compositionend", () => {
+        isComposingInput = false;
+    });
+
     $el.addClass("note-autocomplete-input");
 
     const $clearTextButton = $("<a>").addClass("input-group-text input-clearer-button bx bxs-tag-x").prop("title", t("note_autocomplete.clear-text-field"));
@@ -226,7 +244,19 @@ function initNoteAutocomplete($el: JQuery<HTMLElement>, options?: Options) {
         },
         [
             {
-                source: (term, cb) => autocompleteSource(term, cb, options),
+                source: (term, cb) => {
+                    clearTimeout(debounceTimeoutId);
+                    debounceTimeoutId = setTimeout(() => {
+                        if (isComposingInput) {
+                            return;
+                        }
+                        autocompleteSource(term, cb, options);
+                    }, searchDelay);
+
+                    if (searchDelay === 0) {
+                        searchDelay = getSearchDelay(notesCount);
+                    }
+                },
                 displayKey: "notePathTitle",
                 templates: {
                     suggestion: (suggestion) => suggestion.highlightedNotePathTitle
diff --git a/src/routes/api/autocomplete.ts b/src/routes/api/autocomplete.ts
index a357ca4b3..584c2c88a 100644
--- a/src/routes/api/autocomplete.ts
+++ b/src/routes/api/autocomplete.ts
@@ -8,6 +8,7 @@ import cls from "../../services/cls.js";
 import becca from "../../becca/becca.js";
 import type { Request } from "express";
 import ValidationError from "../../errors/validation_error.js";
+import sql from "../../services/sql.js";
 
 function getAutocomplete(req: Request) {
     if (typeof req.query.query !== "string") {
@@ -79,6 +80,15 @@ function getRecentNotes(activeNoteId: string) {
     });
 }
 
+// Get the total number of notes
+function getNotesCount(req: Request) {
+    const notesCount = sql.getRow(
+        `SELECT COUNT(*) AS count FROM notes WHERE isDeleted = 0;`,
+    ) as { count: number };
+    return notesCount.count;
+}
+
 export default {
-    getAutocomplete
+    getAutocomplete,
+    getNotesCount
 };
diff --git a/src/routes/routes.ts b/src/routes/routes.ts
index abae1acaa..a08a37c9b 100644
--- a/src/routes/routes.ts
+++ b/src/routes/routes.ts
@@ -273,6 +273,7 @@ function register(app: express.Application) {
     route(PST, "/api/setup/sync-seed", [auth.checkAppNotInitialized], setupApiRoute.saveSyncSeed, apiResultHandler, false);
 
     apiRoute(GET, "/api/autocomplete", autocompleteApiRoute.getAutocomplete);
+    apiRoute(GET, "/api/autocomplete/notesCount", autocompleteApiRoute.getNotesCount);
     apiRoute(GET, "/api/quick-search/:searchString", searchRoute.quickSearch);
     apiRoute(GET, "/api/search-note/:noteId", searchRoute.searchFromNote);
     apiRoute(PST, "/api/search-and-execute-note/:noteId", searchRoute.searchAndExecute);