diff --git a/.nvmrc b/.nvmrc
new file mode 100644
index 00000000..2bd5a0a9
--- /dev/null
+++ b/.nvmrc
@@ -0,0 +1 @@
+22
diff --git a/apps/web/package.json b/apps/web/package.json
index a10d38a7..7b7b1ab4 100644
--- a/apps/web/package.json
+++ b/apps/web/package.json
@@ -2,10 +2,13 @@
   "name": "@mydevtools/web",
   "version": "0.1.0",
   "private": true,
+  "engines": {
+    "node": ">=20.19.0"
+  },
   "scripts": {
     "dev": "next dev",
     "build": "next build",
-    "analyze": "ANALYZE=true next build",
+    "analyze": "ANALYZE=true next build --webpack",
     "start": "next start",
     "lint": "eslint .",
     "test": "jest",
diff --git a/apps/web/src/app/app/to-do/utils/exportUtils.ts b/apps/web/src/app/app/to-do/utils/exportUtils.ts
deleted file mode 100644
index 447daf3d..00000000
--- a/apps/web/src/app/app/to-do/utils/exportUtils.ts
+++ /dev/null
@@ -1,42 +0,0 @@
-import { Task } from "@/app/app/to-do/types/Task";
-import * as XLSX from "xlsx";
-import { saveAs } from "file-saver";
-import { format } from "date-fns";
-
-// Helper to flatten task data for export
-const formatTaskForExport = (task: Task) => {
-    return {
-        ID: task.id,
-        Text: task.text,
-        Description: task.description || "",
-        Status: task.status,
-        Priority: task.priority || "",
-        "Due Date": task.dueDate ? (typeof task.dueDate === 'string' ? task.dueDate : format(new Date(task.dueDate as any), "yyyy-MM-dd HH:mm")) : "",
-        Tags: task.tags?.map((t) => t.name).join(", ") || "",
-        "Subtasks Total": task.subTasks?.length || 0,
-        "Subtasks Completed": task.subTasks?.filter((st) => st.completed).length || 0,
-        "Created At": task.createdAt,
-        "Completed At": task.completedAt || "",
-        "Time Estimate (min)": task.timeEstimate || 0,
-        "Time Logged (min)": task.timeLogged || 0,
-        "Project ID": task.projectId || "",
-    };
-};
-
-export const exportToExcel = (tasks: Task[], filename: string) => {
-    const data = tasks.map(formatTaskForExport);
-    const worksheet = XLSX.utils.json_to_sheet(data);
-    const workbook = XLSX.utils.book_new();
-    XLSX.utils.book_append_sheet(workbook, worksheet, "Tasks");
-    const excelBuffer = XLSX.write(workbook, { bookType: "xlsx", type: "array" });
-    const blob = new Blob([excelBuffer], { type: "application/octet-stream" });
-    saveAs(blob, `${filename}.xlsx`);
-};
-
-export const exportToCSV = (tasks: Task[], filename: string) => {
-    const data = tasks.map(formatTaskForExport);
-    const worksheet = XLSX.utils.json_to_sheet(data);
-    const csvOutput = XLSX.utils.sheet_to_csv(worksheet);
-    const blob = new Blob([csvOutput], { type: "text/csv;charset=utf-8" });
-    saveAs(blob, `${filename}.csv`);
-};
diff --git a/apps/web/src/components/json-formatter/json-formatter-layout.tsx b/apps/web/src/components/json-formatter/json-formatter-layout.tsx
index 01843720..bea53f22 100644
--- a/apps/web/src/components/json-formatter/json-formatter-layout.tsx
+++ b/apps/web/src/components/json-formatter/json-formatter-layout.tsx
@@ -13,7 +13,7 @@ import {
   IconRefresh,
 } from '@tabler/icons-react'
 import { toast } from 'sonner'
-import { Mode, toTextContent, type Content, type OnChangeStatus } from 'vanilla-jsoneditor'
+import type { Mode, Content, OnChangeStatus } from 'vanilla-jsoneditor'
 import { fetchAllPages } from '@/lib/fetch-all-pages'
 import { ToolPageHeader } from '@/components/tools/tool-page-header'
 import { ToolMobileTabs } from '@/components/tools/tool-mobile-tabs'
@@ -38,6 +38,14 @@ import {
 } from '@/components/ui/responsive-modal'
 import { ScrollArea } from '@/components/ui/scroll-area'
 
+// Local copy of vanilla-jsoneditor's toTextContent, kept out of the static import so the
+// 485KB editor barrel isn't dragged into this route's initial chunk (editor loads lazily).
+function contentToText(content: Content): string {
+  if ('text' in content && content.text !== undefined) return content.text
+  // vanilla-jsoneditor's toTextContent defaults to compact (no indentation) — match it.
+  return JSON.stringify((content as { json: unknown }).json)
+}
+
 const initialJson = {
   array: [1, 2, 3],
   boolean: true,
@@ -179,8 +187,8 @@ export function JsonFormatterLayout() {
 
   const handleCopy = (pane: PaneKey) => {
     const paneState = pane === 'left' ? leftPane : rightPane
-    const textContent = toTextContent(paneState.content)
-    void copyToClipboard(textContent.text, {
+    const textContentText = contentToText(paneState.content)
+    void copyToClipboard(textContentText, {
       successMessage: pane === 'left' ? t('toastCopiedText') : t('toastCopiedTree'),
       errorMessage: t('toastCopyFailed'),
     })
@@ -195,11 +203,11 @@ export function JsonFormatterLayout() {
     const paneState = pane === 'left' ? leftPane : rightPane
     try {
       updatePane(pane, (prev) => ({ ...prev, isSaving: true }))
-      const textContent = toTextContent(paneState.content)
+      const textContentText = contentToText(paneState.content)
       const body = {
         title: paneState.documentName,
         pane,
-        content: textContent.text,
+        content: textContentText,
       }
 
       if (paneState.documentId) {
@@ -306,7 +314,7 @@ export function JsonFormatterLayout() {
           <IconCopy className="mr-1.5 h-4 w-4" />
           {t('copy')}
         </Button>
-        <SendToMenu content={toTextContent(state.content).text} />
+        <SendToMenu content={contentToText(state.content)} />
         <Button variant="outline" size="sm" onClick={() => openLoadDialog(pane)}>
           <IconFolderOpen className="mr-1.5 h-4 w-4" />
           {t.has('load') ? t('load') : 'Load'}
@@ -345,7 +353,7 @@ export function JsonFormatterLayout() {
           <div className="min-h-0 flex-1">
             {activePane === 'left' ? (
               <VanillaEditor
-                mode={Mode.text}
+                mode={'text' as Mode}
                 content={leftPane.content}
                 onChange={(updated, previous, status) =>
                   handlePaneChange('left', updated, previous, status)
@@ -356,7 +364,7 @@ export function JsonFormatterLayout() {
               />
             ) : (
               <VanillaEditor
-                mode={Mode.tree}
+                mode={'tree' as Mode}
                 content={rightPane.content}
                 onChange={(updated, previous, status) =>
                   handlePaneChange('right', updated, previous, status)
@@ -378,7 +386,7 @@ export function JsonFormatterLayout() {
               {renderPaneToolbar('left')}
               <div className="min-h-0 flex-1">
                 <VanillaEditor
-                  mode={Mode.text}
+                  mode={'text' as Mode}
                   content={leftPane.content}
                   onChange={(updated, previous, status) =>
                     handlePaneChange('left', updated, previous, status)
@@ -398,7 +406,7 @@ export function JsonFormatterLayout() {
               {renderPaneToolbar('right')}
               <div className="min-h-0 flex-1">
                 <VanillaEditor
-                  mode={Mode.tree}
+                  mode={'tree' as Mode}
                   content={rightPane.content}
                   onChange={(updated, previous, status) =>
                     handlePaneChange('right', updated, previous, status)
diff --git a/apps/web/src/components/json-formatter/vanilla-editor.tsx b/apps/web/src/components/json-formatter/vanilla-editor.tsx
index ab25a574..d4a821d1 100644
--- a/apps/web/src/components/json-formatter/vanilla-editor.tsx
+++ b/apps/web/src/components/json-formatter/vanilla-editor.tsx
@@ -1,7 +1,7 @@
 'use client'
 
 import { useEffect, useRef, useState } from 'react'
-import { JSONEditor, JSONEditorPropsOptional } from 'vanilla-jsoneditor'
+import type { JSONEditorPropsOptional } from 'vanilla-jsoneditor'
 import { useTheme } from 'next-themes'
 import { cn } from '@/lib/utils'
 import 'vanilla-jsoneditor/themes/jse-theme-dark.css'
@@ -12,7 +12,9 @@ interface VanillaEditorProps extends JSONEditorPropsOptional {
 
 export function VanillaEditor({ className = '', ...props }: VanillaEditorProps) {
   const refContainer = useRef<HTMLDivElement>(null)
-  const refEditor = useRef<ReturnType<typeof JSONEditor> | null>(null)
+  const refEditor = useRef<ReturnType<typeof import('vanilla-jsoneditor').JSONEditor> | null>(null)
+  const propsRef = useRef(props)
+  propsRef.current = props
   const { resolvedTheme } = useTheme()
   const [mounted, setMounted] = useState(false)
 
@@ -23,22 +25,24 @@ export function VanillaEditor({ className = '', ...props }: VanillaEditorProps)
   const isDarkTheme = mounted && resolvedTheme === 'dark'
 
   useEffect(() => {
-    // create editor
-    if (refContainer.current && !refEditor.current) {
+    let disposed = false
+    // vanilla-jsoneditor is ~485KB; load it on mount so the tool page paints without it.
+    void import('vanilla-jsoneditor').then(({ JSONEditor }) => {
+      if (disposed || !refContainer.current || refEditor.current) return
       refEditor.current = JSONEditor({
         target: refContainer.current,
-        props,
+        props: propsRef.current,
       })
-    }
+    })
 
     return () => {
       // destroy editor
+      disposed = true
       if (refEditor.current) {
         refEditor.current.destroy()
         refEditor.current = null
       }
     }
-    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [])
 
   // update props
diff --git a/apps/web/src/components/sql-formatter/sql-formatter-layout.tsx b/apps/web/src/components/sql-formatter/sql-formatter-layout.tsx
index 3df7a03a..c342cf26 100644
--- a/apps/web/src/components/sql-formatter/sql-formatter-layout.tsx
+++ b/apps/web/src/components/sql-formatter/sql-formatter-layout.tsx
@@ -1,6 +1,6 @@
 'use client';
 
-import { format, type KeywordCase, type SqlLanguage } from 'sql-formatter';
+import type { KeywordCase, SqlLanguage } from 'sql-formatter';
 import { useCallback, useState } from 'react';
 import { useCopyToClipboard } from '@/hooks/use-copy-to-clipboard';
 import { Button } from '@/components/ui/button';
@@ -51,7 +51,7 @@ export function SqlFormatterLayout() {
   const [error, setError] = useState('');
   const { isCopied: copied, copyToClipboard, reset: resetCopied } = useCopyToClipboard();
 
-  const runFormat = useCallback(() => {
+  const runFormat = useCallback(async () => {
     setError('');
     resetCopied();
     if (isMobile) setMobileTab('output');
@@ -67,6 +67,8 @@ export function SqlFormatterLayout() {
     }
     try {
       const tw = Math.min(8, Math.max(1, parseInt(tabWidth, 10) || 2));
+      // sql-formatter is ~278KB; load on first format so the tool page paints without it.
+      const { format } = await import('sql-formatter');
       setOutput(
         format(q, {
           language: dialect,
diff --git a/apps/web/src/components/svg-optimizer/svg-optimizer-layout.tsx b/apps/web/src/components/svg-optimizer/svg-optimizer-layout.tsx
index e236f1e8..ae8cd2d8 100644
--- a/apps/web/src/components/svg-optimizer/svg-optimizer-layout.tsx
+++ b/apps/web/src/components/svg-optimizer/svg-optimizer-layout.tsx
@@ -11,7 +11,8 @@ import { Textarea } from '@/components/ui/textarea'
 import { Alert, AlertDescription, AlertTitle } from '@/components/ui/alert'
 import { Check, Copy, Download, Trash2, Sparkles } from 'lucide-react'
 import { cn } from '@/lib/utils'
-import { optimizeSvgMarkup, utf8ByteLength } from '@/lib/svg-optimize'
+import { utf8ByteLength } from '@/lib/svg-optimize'
+import { useSvgOptimizeWorker } from '@/hooks/use-svg-optimize-worker'
 
 const SAMPLE_SVG = `<svg xmlns="http://www.w3.org/2000/svg" width="120" height="120" viewBox="0 0 120 120">
   <!-- demo: metadata + whitespace -->
@@ -30,17 +31,22 @@ export function SvgOptimizerLayout() {
   const [output, setOutput] = useState('')
   const [error, setError] = useState<string | null>(null)
   const { isCopied: copied, copyToClipboard } = useCopyToClipboard()
+  const { optimize } = useSvgOptimizeWorker()
 
-  const runOptimize = useCallback((raw: string) => {
-    const result = optimizeSvgMarkup(raw)
-    if (result.ok) {
-      setOutput(result.data)
-      setError(null)
-    } else {
-      setOutput('')
-      setError(result.error)
+  const runOptimize = useCallback(async (raw: string) => {
+    try {
+      const result = await optimize(raw)
+      if (result.ok) {
+        setOutput(result.data)
+        setError(null)
+      } else {
+        setOutput('')
+        setError(result.error)
+      }
+    } catch {
+      // worker unmounted or failed mid-flight — component is going away, ignore
     }
-  }, [])
+  }, [optimize])
 
   const debouncedOptimize = useDebouncedCallback(runOptimize, 280)
 
diff --git a/apps/web/src/hooks/use-svg-optimize-worker.ts b/apps/web/src/hooks/use-svg-optimize-worker.ts
new file mode 100644
index 00000000..bed9eb93
--- /dev/null
+++ b/apps/web/src/hooks/use-svg-optimize-worker.ts
@@ -0,0 +1,86 @@
+'use client';
+
+import { useCallback, useEffect, useRef } from 'react';
+import { optimizeSvgMarkup, shouldUseSvgWorker } from '@/lib/svg-optimize';
+import type { SvgOptimizeRequest, SvgOptimizeResponse } from '@/workers/svg-optimize.worker';
+
+type SvgOptimizeResult = Awaited<ReturnType<typeof optimizeSvgMarkup>>;
+
+type PendingRequest = {
+  resolve: (result: SvgOptimizeResult) => void;
+  reject: (error: Error) => void;
+};
+
+/**
+ * SVG optimization that moves off the main thread for large documents.
+ *
+ * - SVGs >= SVG_WORKER_MIN_CHARS route through a lazily-created Web Worker
+ *   (terminated on unmount) so svgo's parse/optimize never blocks typing.
+ * - Small SVGs, SSR/no-Worker environments, and a previously-failed worker
+ *   fall back to the same optimizeSvgMarkup on the main thread.
+ */
+export function useSvgOptimizeWorker() {
+  const workerRef = useRef<Worker | null>(null);
+  const workerFailedRef = useRef(false);
+  const pendingRef = useRef(new Map<number, PendingRequest>());
+  const nextIdRef = useRef(0);
+
+  const getWorker = useCallback((): Worker | null => {
+    if (workerFailedRef.current || typeof Worker === 'undefined') return null;
+    if (!workerRef.current) {
+      const worker = new Worker(new URL('../workers/svg-optimize.worker.ts', import.meta.url), {
+        type: 'module',
+      });
+      worker.onmessage = (event: MessageEvent<SvgOptimizeResponse>) => {
+        const pending = pendingRef.current.get(event.data.id);
+        if (!pending) return;
+        pendingRef.current.delete(event.data.id);
+        const { id: _id, ...result } = event.data;
+        pending.resolve(result);
+      };
+      worker.onerror = () => {
+        // Worker failed to load or crashed: fail everything in flight and
+        // route all future calls through the main-thread fallback.
+        for (const pending of pendingRef.current.values()) {
+          pending.reject(new Error('svg optimize worker failed'));
+        }
+        pendingRef.current.clear();
+        worker.terminate();
+        workerRef.current = null;
+        workerFailedRef.current = true;
+      };
+      workerRef.current = worker;
+    }
+    return workerRef.current;
+  }, []);
+
+  const optimize = useCallback(
+    (svg: string): Promise<SvgOptimizeResult> => {
+      const worker = shouldUseSvgWorker(svg, typeof Worker !== 'undefined') ? getWorker() : null;
+      if (!worker) return optimizeSvgMarkup(svg);
+      const id = nextIdRef.current++;
+      return new Promise<SvgOptimizeResult>((resolve, reject) => {
+        pendingRef.current.set(id, { resolve, reject });
+        const request: SvgOptimizeRequest = { id, svg };
+        worker.postMessage(request);
+      });
+    },
+    [getWorker],
+  );
+
+  useEffect(() => {
+    const pending = pendingRef.current;
+    return () => {
+      // Reject in-flight requests before clearing so any caller still awaiting
+      // optimize() settles instead of hanging forever (mirrors onerror above).
+      for (const request of pending.values()) {
+        request.reject(new Error('svg optimize worker unmounted'));
+      }
+      workerRef.current?.terminate();
+      workerRef.current = null;
+      pending.clear();
+    };
+  }, []);
+
+  return { optimize };
+}
diff --git a/apps/web/src/lib/svg-optimize.ts b/apps/web/src/lib/svg-optimize.ts
index a5c95b59..61fc53e3 100644
--- a/apps/web/src/lib/svg-optimize.ts
+++ b/apps/web/src/lib/svg-optimize.ts
@@ -1,4 +1,4 @@
-import { optimize, type Config } from 'svgo/browser'
+import type { Config } from 'svgo/browser'
 
 /** Preset-default keeps responsive icons working; multipass squeezes extra wins. */
 const SVGO_OPTIONS = {
@@ -10,12 +10,22 @@ export function utf8ByteLength(text: string): number {
   return new TextEncoder().encode(text).length
 }
 
-export function optimizeSvgMarkup(svg: string): { ok: true; data: string } | { ok: false; error: string } {
+// Below this, main-thread optimize beats worker round-trip + svgo chunk load.
+// ponytail: fixed char threshold; tune if profiling shows jank on smaller SVGs.
+export const SVG_WORKER_MIN_CHARS = 15_000
+
+export function shouldUseSvgWorker(svg: string, hasWorker: boolean): boolean {
+  return hasWorker && svg.length >= SVG_WORKER_MIN_CHARS
+}
+
+// svgo is ~525KB; load it on first optimize so the tool page paints without it.
+export async function optimizeSvgMarkup(svg: string): Promise<{ ok: true; data: string } | { ok: false; error: string }> {
   const trimmed = svg.trim()
   if (!trimmed) {
     return { ok: true, data: '' }
   }
   try {
+    const { optimize } = await import('svgo/browser')
     const { data } = optimize(trimmed, SVGO_OPTIONS as Config)
     return { ok: true, data }
   } catch (e) {
diff --git a/apps/web/src/workers/svg-optimize.worker.ts b/apps/web/src/workers/svg-optimize.worker.ts
new file mode 100644
index 00000000..87337ba5
--- /dev/null
+++ b/apps/web/src/workers/svg-optimize.worker.ts
@@ -0,0 +1,17 @@
+import { optimizeSvgMarkup } from '@/lib/svg-optimize';
+
+export type SvgOptimizeRequest = {
+  id: number;
+  svg: string;
+};
+
+export type SvgOptimizeResponse =
+  | { id: number; ok: true; data: string }
+  | { id: number; ok: false; error: string };
+
+self.onmessage = async (event: MessageEvent<SvgOptimizeRequest>) => {
+  const { id, svg } = event.data;
+  const result = await optimizeSvgMarkup(svg);
+  const response: SvgOptimizeResponse = { id, ...result };
+  self.postMessage(response);
+};