diff --git a/packages/ui-default/build/config/gulp.js b/packages/ui-default/build/config/gulp.js
index 81455936..7610719e 100644
--- a/packages/ui-default/build/config/gulp.js
+++ b/packages/ui-default/build/config/gulp.js
@@ -1,15 +1,15 @@
 /* eslint-disable no-restricted-syntax */
 /* eslint-disable guard-for-in */
 /* eslint-disable import/no-extraneous-dependencies */
-import _ from 'lodash';
-import gulp from 'gulp';
-import log from 'fancy-log';
 import chalk from 'chalk';
-import svgmin from 'gulp-svgmin';
-import vinylBuffer from 'vinyl-buffer';
+import log from 'fancy-log';
+import gulp from 'gulp';
 import iconfont from 'gulp-iconfont';
-import plumber from 'gulp-plumber';
 import gulpif from 'gulp-if';
+import plumber from 'gulp-plumber';
+import svgmin from 'gulp-svgmin';
+import _ from 'lodash';
+import vinylBuffer from 'vinyl-buffer';
 import nunjucks from '../plugins/gulpNunjucks';
 import vjTouch from '../plugins/gulpTouch';
 
diff --git a/packages/ui-default/build/config/webpack.ts b/packages/ui-default/build/config/webpack.ts
index 0de553a6..f9901c36 100644
--- a/packages/ui-default/build/config/webpack.ts
+++ b/packages/ui-default/build/config/webpack.ts
@@ -217,7 +217,6 @@ export default function (env: { production?: boolean, measure?: boolean } = {})
         $: 'jquery',
         jQuery: 'jquery',
         'window.jQuery': 'jquery',
-        katex: 'katex/dist/katex.js',
         React: 'react',
         monaco: 'monaco-editor/esm/vs/editor/editor.api',
       }),
diff --git a/packages/ui-default/build/main.ts b/packages/ui-default/build/main.ts
index 14d740c6..47e9af63 100644
--- a/packages/ui-default/build/main.ts
+++ b/packages/ui-default/build/main.ts
@@ -1,11 +1,14 @@
 /* eslint-disable import/no-import-module-exports */
-/* eslint-disable import/no-extraneous-dependencies */
+import { size } from '@hydrooj/utils/lib/utils';
 import cac from 'cac';
 import chalk from 'chalk';
+import { build } from 'esbuild';
 import log from 'fancy-log';
 import fs from 'fs-extra';
 import gulp from 'gulp';
-import webpack from 'webpack';
+import { sum } from 'lodash';
+import path from 'path';
+import webpack, { Stats } from 'webpack';
 import WebpackDevServer from 'webpack-dev-server';
 import pkg from '../package.json';
 import gulpConfig from './config/gulp';
@@ -24,14 +27,15 @@ async function runWebpack({
       compress: true,
       hot: true,
       proxy: {
-        context: (path) => path !== '/ws',
+        context: (p) => p !== '/ws',
         target: 'http://localhost:2333',
         ws: true,
       },
     }, compiler);
-    return server.start();
+    server.start();
+    return;
   }
-  return new Promise((resolve, reject) => {
+  const res = await new Promise<Stats>((resolve, reject) => {
     function compilerCallback(err, stats) {
       if (err) {
         console.error(err.stack || err);
@@ -42,11 +46,40 @@ async function runWebpack({
       }
       if (argv.options.detail) console.log(stats.toString());
       if (!watch && (!stats || stats.hasErrors())) process.exitCode = 1;
-      resolve(null);
+      resolve(stats);
     }
     if (watch) compiler.watch({}, compilerCallback);
     else compiler.run(compilerCallback);
   });
+  if (production && res && !res.hasErrors()) {
+    const stats = {};
+    const files = fs.readdirSync(root('public'), { withFileTypes: true });
+    for (const file of files) {
+      if (!file.isFile() || file.name.endsWith('.map')) continue;
+      const data = await fs.stat(path.join(root('public'), file.name));
+      stats[file.name.replace(/\.[a-f0-9]{10}\./, '.')] = data.size;
+    }
+    const statsPath = root('__bundleInfo');
+    if (fs.existsSync(statsPath)) {
+      log('Compare to last production bundle:');
+      const oldStats = JSON.parse(await fs.readFile(statsPath, 'utf-8')) as Record<string, number>;
+      for (const key in stats) if (!oldStats[key]) oldStats[key] = 0;
+      const entries: [filename: string, orig: number, curr: number][] = [];
+      for (const [key, value] of Object.entries(oldStats)) {
+        if (Math.abs((stats[key] || 0) - value) > 25) entries.push([key, value, stats[key] || 0]);
+      }
+      const sorted = entries.sort((i) => i[1] - i[2]);
+      sorted.push(['Total', sum(sorted.map((i) => i[1])), sum(sorted.map((i) => i[2]))]);
+      for (const entry of sorted) {
+        const [name, orig, curr] = entry;
+        const diff = 100 * (curr - orig) / orig;
+        if (Math.abs(diff) < 0.01 && name !== 'Total') continue;
+        const color = orig > curr ? chalk.green : chalk.red;
+        log(color(`${name.padStart(35)} ${size(orig).padStart(10)} -> ${size(curr).padEnd(10)} (${diff.toPrecision(5)}%)`), chalk.reset());
+      }
+    }
+    await fs.writeFile(statsPath, JSON.stringify(stats));
+  }
 }
 
 async function runGulp() {
diff --git a/packages/ui-default/build/plugins/gulpNunjucks.js b/packages/ui-default/build/plugins/gulpNunjucks.js
index dffa94c0..e1556b2f 100644
--- a/packages/ui-default/build/plugins/gulpNunjucks.js
+++ b/packages/ui-default/build/plugins/gulpNunjucks.js
@@ -1,5 +1,5 @@
-import through from 'through2';
 import nunjucks from 'nunjucks';
+import through from 'through2';
 
 export default function compile(data, options = {}) {
   return through.obj(function (file, encoding, callback) {
diff --git a/packages/ui-default/build/plugins/gulpTouch.js b/packages/ui-default/build/plugins/gulpTouch.js
index c1ab2d1b..58fc26a8 100644
--- a/packages/ui-default/build/plugins/gulpTouch.js
+++ b/packages/ui-default/build/plugins/gulpTouch.js
@@ -1,7 +1,7 @@
 /* eslint-disable import/no-extraneous-dependencies */
+import fs from 'fs-extra';
 import PluginError from 'plugin-error';
 import through from 'through2';
-import fs from 'fs-extra';
 
 export default function touch(mtime) {
   async function touchFile(file) {
diff --git a/packages/ui-default/components/form/button.page.98.styl b/packages/ui-default/components/form/button.page.98.styl
deleted file mode 100644
index ac7e7d83..00000000
--- a/packages/ui-default/components/form/button.page.98.styl
+++ /dev/null
@@ -1,32 +0,0 @@
-@import './var.inc.styl'
-
-.button
-  box-sizing: border-box
-  border: none
-  background: #c0c0c0
-  border-radius: 0
-  min-width: 75px;
-  min-height: 23px;
-  padding: 0 12px;
-
-  &:not(:disabled)
-    &:active
-      box-shadow: --border-sunken-outer, --border-sunken-inner
-      padding: 2px 11px 0 13px;
-
-.button.inverse
-  line-height: rem($form-control-height - 4)
-  border: 2px solid #FFF
-  background: none
-
-  &, &:visited
-    &, .typo &
-      color: #FFF
-
-  &:not(.disabled)
-    &:hover, &:focus
-      border-color: $immersive-primary-color
-      background: none
-      box-shadow: none
-      &, .typo &
-        color: $immersive-primary-color
diff --git a/packages/ui-default/components/highlighter/code-example.js b/packages/ui-default/components/highlighter/code-example.js
index f64616dc..e4b7017c 100644
--- a/packages/ui-default/components/highlighter/code-example.js
+++ b/packages/ui-default/components/highlighter/code-example.js
@@ -1,4 +1,5 @@
-export default `#include <world.h>
+export default `\
+#include <world.h>
 
 int main() {
     // ~ Switch on the power line / Remember to put on PROTECTION ~
diff --git a/packages/ui-default/components/highlighter/codemirror.page.styl b/packages/ui-default/components/highlighter/codemirror.page.styl
deleted file mode 100644
index 8daa5f35..00000000
--- a/packages/ui-default/components/highlighter/codemirror.page.styl
+++ /dev/null
@@ -1,10 +0,0 @@
-@css {
-span.cm-comment { color: #008000; }
-span.cm-keyword, span.cm-variable-3 { line-height: 1em; color: #00f; }
-span.cm-string { color: #a31515; }
-span.cm-builtin { line-height: 1em; font-weight: bold; color: #077; }
-span.cm-special { line-height: 1em; font-weight: bold; color: #0aa; }
-span.cm-variable { color: black; }
-span.cm-meta { color: #2b91af; }
-span.cm-link { color: #3a3; }
-}
diff --git a/packages/ui-default/components/hitokoto/index.page.js b/packages/ui-default/components/hitokoto/index.page.js
index d70b0dcc..4ab68d78 100644
--- a/packages/ui-default/components/hitokoto/index.page.js
+++ b/packages/ui-default/components/hitokoto/index.page.js
@@ -1,10 +1,10 @@
 import $ from 'jquery';
-import { AutoloadPage } from 'vj/misc/Page';
+import { NamedPage } from 'vj/misc/Page';
 import i18n from 'vj/utils/i18n';
 import request from 'vj/utils/request';
 import tpl from 'vj/utils/tpl';
 
-const hitokotoPage = new AutoloadPage('hitokotoPage', () => {
+export default new NamedPage('homepage', () => {
   function getHitokoto($containers) {
     $containers.get().forEach((container) => {
       request.get('https://v1.hitokoto.cn?c=a&c=b&c=c&c=d&c=e&c=f')
@@ -20,10 +20,4 @@ const hitokotoPage = new AutoloadPage('hitokotoPage', () => {
     });
   }
   if ($('[name="hitokoto"]')) getHitokoto($('[name="hitokoto"]'));
-  $(document).on('vjContentNew', (e) => {
-    const elem = $(e.target).find('[name="hitokoto"]');
-    if (elem.get) getHitokoto(elem);
-  });
 });
-
-export default hitokotoPage;
diff --git a/packages/ui-default/components/katex/katex.styl b/packages/ui-default/components/katex.page.styl
similarity index 100%
rename from packages/ui-default/components/katex/katex.styl
rename to packages/ui-default/components/katex.page.styl
diff --git a/packages/ui-default/components/katex/katex.page.js b/packages/ui-default/components/katex/katex.page.js
deleted file mode 100644
index f3a4c970..00000000
--- a/packages/ui-default/components/katex/katex.page.js
+++ /dev/null
@@ -1,26 +0,0 @@
-import $ from 'jquery';
-import { AutoloadPage } from 'vj/misc/Page';
-
-const katexPage = new AutoloadPage('katexPage', () => {
-  import('katex/contrib/auto-render/auto-render').then(({ default: katex }) => {
-    function runKatex($containers) {
-      $containers.get().forEach((container) => katex(container, {
-        delimiters: [
-          { left: '$$', right: '$$', display: true },
-          { left: '$', right: '$', display: false },
-          { left: '\\(', right: '\\)', display: false },
-          { left: '\\[', right: '\\]', display: true },
-          { left: '\\begin{equation}', right: '\\end{equation}', display: true },
-          { left: '\\begin{align}', right: '\\end{align}', display: true },
-          { left: '\\begin{alignat}', right: '\\end{alignat}', display: true },
-          { left: '\\begin{gather}', right: '\\end{gather}', display: true },
-          { left: '\\begin{CD}', right: '\\end{CD}', display: true },
-        ],
-      }));
-    }
-    runKatex($('.typo'));
-    $(document).on('vjContentNew', (e) => runKatex($(e.target).find('.typo')));
-  });
-});
-
-export default katexPage;
diff --git a/packages/ui-default/components/nprogress/nprogress.page.styl b/packages/ui-default/components/nprogress.page.styl
similarity index 100%
rename from packages/ui-default/components/nprogress/nprogress.page.styl
rename to packages/ui-default/components/nprogress.page.styl
diff --git a/packages/ui-default/components/nprogress/index.js b/packages/ui-default/components/nprogress/index.js
deleted file mode 100644
index e7edcffe..00000000
--- a/packages/ui-default/components/nprogress/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-import NProgress from 'nprogress';
-
-export default NProgress;
diff --git a/packages/ui-default/constant/domain.js b/packages/ui-default/constant/domain.js
index ba52b020..ae361878 100644
--- a/packages/ui-default/constant/domain.js
+++ b/packages/ui-default/constant/domain.js
@@ -1,5 +1,3 @@
-import attachObjectMeta from './util/objectMeta';
-
 export const JOIN_METHOD_NONE = 0;
 export const JOIN_METHOD_ALL = 1;
 export const JOIN_METHOD_CODE = 2;
@@ -8,7 +6,6 @@ export const JOIN_METHOD_RANGE = {
   [JOIN_METHOD_ALL]: 'Any user is allowed to join this domain',
   [JOIN_METHOD_CODE]: 'Any user is allowed to join this domain with an invitation code',
 };
-attachObjectMeta(JOIN_METHOD_RANGE, 'intKey', true);
 
 export const JOIN_EXPIRATION_KEEP_CURRENT = 0;
 export const JOIN_EXPIRATION_UNLIMITED = -1;
@@ -22,4 +19,3 @@ export const JOIN_EXPIRATION_RANGE = {
   [24 * 30]: 'In 1 month',
   [JOIN_EXPIRATION_UNLIMITED]: 'Never expire',
 };
-attachObjectMeta(JOIN_EXPIRATION_RANGE, 'intKey', true);
diff --git a/packages/ui-default/constant/model.js b/packages/ui-default/constant/model.js
deleted file mode 100644
index 634ef613..00000000
--- a/packages/ui-default/constant/model.js
+++ /dev/null
@@ -1,18 +0,0 @@
-import attachObjectMeta from './util/objectMeta';
-
-export const USER_GENDER_MALE = 0;
-export const USER_GENDER_FEMALE = 1;
-export const USER_GENDER_OTHER = 2;
-export const USER_GENDERS = [USER_GENDER_MALE, USER_GENDER_FEMALE, USER_GENDER_OTHER];
-export const USER_GENDER_RANGE = {
-  [USER_GENDER_MALE]: 'Boy ♂',
-  [USER_GENDER_FEMALE]: 'Girl ♀',
-  [USER_GENDER_OTHER]: 'Other',
-};
-attachObjectMeta(USER_GENDER_RANGE, 'intKey', true);
-export const USER_GENDER_ICONS = {
-  [USER_GENDER_MALE]: '♂',
-  [USER_GENDER_FEMALE]: '♀',
-  [USER_GENDER_OTHER]: '?',
-};
-attachObjectMeta(USER_GENDER_ICONS, 'intKey', true);
diff --git a/packages/ui-default/constant/record.js b/packages/ui-default/constant/record.js
index 867b035f..bbd95b2b 100644
--- a/packages/ui-default/constant/record.js
+++ b/packages/ui-default/constant/record.js
@@ -1,5 +1,3 @@
-import attachObjectMeta from './util/objectMeta';
-
 // Please note that accepted < others, rp system uses this feature.
 export const STATUS_WAITING = 0;
 export const STATUS_ACCEPTED = 1;
@@ -34,7 +32,6 @@ export const STATUS_TEXTS = {
   [STATUS_FETCHED]: 'Fetched',
   [STATUS_IGNORED]: 'Ignored',
 };
-attachObjectMeta(STATUS_TEXTS, 'intKey', true);
 
 export const STATUS_CODES = {
   [STATUS_WAITING]: 'pending',
@@ -53,7 +50,6 @@ export const STATUS_CODES = {
   [STATUS_FETCHED]: 'progress',
   [STATUS_IGNORED]: 'ignored',
 };
-attachObjectMeta(STATUS_CODES, 'intKey', true);
 
 /**
  * Whether to show detail about each test case for a submission status
@@ -74,7 +70,6 @@ export const STATUS_SCRATCHPAD_SHOW_DETAIL_FLAGS = {
   [STATUS_FETCHED]: false,
   [STATUS_IGNORED]: false,
 };
-attachObjectMeta(STATUS_SCRATCHPAD_SHOW_DETAIL_FLAGS, 'exportToPython', false);
 
 /**
  * Short text to show in Scratchpad mode
@@ -86,4 +81,3 @@ export const STATUS_SCRATCHPAD_SHORT_TEXTS = {
   [STATUS_MEMORY_LIMIT_EXCEEDED]: 'MLE',
   [STATUS_RUNTIME_ERROR]: 'RTE',
 };
-attachObjectMeta(STATUS_SCRATCHPAD_SHORT_TEXTS, 'exportToPython', false);
diff --git a/packages/ui-default/constant/setting.js b/packages/ui-default/constant/setting.js
deleted file mode 100644
index a2a919d6..00000000
--- a/packages/ui-default/constant/setting.js
+++ /dev/null
@@ -1,17 +0,0 @@
-import attachObjectMeta from './util/objectMeta';
-
-export const PRIVACY_PUBLIC = 0;
-export const PRIVACY_REGISTERED_ONLY = 1;
-export const PRIVACY_SECRET = 2;
-export const PRIVACY_RANGE = {
-  [PRIVACY_PUBLIC]: 'Public',
-  [PRIVACY_REGISTERED_ONLY]: 'Visible to registered users',
-  [PRIVACY_SECRET]: 'Secret',
-};
-attachObjectMeta(PRIVACY_RANGE, 'intKey', true);
-
-export const FUNCTION_RANGE = {
-  0: 'Disabled',
-  1: 'Enabled',
-};
-attachObjectMeta(FUNCTION_RANGE, 'intKey', true);
diff --git a/packages/ui-default/constant/util/objectMeta.js b/packages/ui-default/constant/util/objectMeta.js
deleted file mode 100644
index f51df3a4..00000000
--- a/packages/ui-default/constant/util/objectMeta.js
+++ /dev/null
@@ -1,8 +0,0 @@
-export default function attachObjectMeta(obj, key, value) {
-  Object.defineProperty(obj, `__${key}`, {
-    value,
-    enumerable: false,
-    configurable: false,
-    writable: false,
-  });
-}
diff --git a/packages/ui-default/modules.js b/packages/ui-default/modules.js
index 633abe95..dc9e6000 100644
--- a/packages/ui-default/modules.js
+++ b/packages/ui-default/modules.js
@@ -4,7 +4,6 @@ import './utils/i18n';
 import './utils/loadReactRedux';
 import './utils/mediaQuery';
 import './utils/mongoId';
-import './utils/parseQueryString';
 import './utils/pipeStream';
 import './utils/pjax';
 import './utils/request';
@@ -16,7 +15,6 @@ import './utils/zip';
 import './components/autocomplete';
 import './components/dialog';
 import './components/notification';
-import './components/nprogress';
 import './components/monaco/loader';
 
 import $ from 'jquery';
diff --git a/packages/ui-default/pages/files.page.js b/packages/ui-default/pages/files.page.js
index 0688ebac..86bcc54a 100644
--- a/packages/ui-default/pages/files.page.js
+++ b/packages/ui-default/pages/files.page.js
@@ -88,7 +88,6 @@ async function handleClickUpload(files) {
     Notification.success(i18n('File uploaded successfully.'));
     await pjax.request({ push: false });
   } catch (e) {
-    window.captureException?.(e);
     console.error(e);
     Notification.error(i18n('File upload failed: {0}', e.toString()));
   } finally {
diff --git a/packages/ui-default/pages/home_messages.page.jsx b/packages/ui-default/pages/home_messages.page.jsx
index fad56c91..15ef3ba6 100644
--- a/packages/ui-default/pages/home_messages.page.jsx
+++ b/packages/ui-default/pages/home_messages.page.jsx
@@ -7,7 +7,6 @@ import VjNotification from 'vj/components/notification';
 import { NamedPage } from 'vj/misc/Page';
 import api, { gql } from 'vj/utils/api';
 import loadReactRedux from 'vj/utils/loadReactRedux';
-import parseQueryString from 'vj/utils/parseQueryString';
 
 const page = new NamedPage('home_messages', () => {
   let reduxStore;
@@ -92,10 +91,10 @@ const page = new NamedPage('home_messages', () => {
    * A target user id may be assigned in the query string.
    */
   async function loadSendTarget() {
-    const queryString = parseQueryString();
-    if (!queryString.target) return;
+    const target = new URL(window.location.href).searchParams.get('target');
+    if (!target) return;
     const user = await api(gql`
-      users(search: ${queryString.target}, exact: true) {
+      users(search: ${target}, exact: true) {
         _id
         uname
         avatarUrl
diff --git a/packages/ui-default/pages/problem_files.page.js b/packages/ui-default/pages/problem_files.page.js
index 5f853885..95bd71eb 100644
--- a/packages/ui-default/pages/problem_files.page.js
+++ b/packages/ui-default/pages/problem_files.page.js
@@ -100,7 +100,6 @@ const page = new NamedPage('problem_files', () => {
       Notification.success(i18n('File uploaded successfully.'));
       await pjax.request({ push: false });
     } catch (e) {
-      window.captureException?.(e);
       console.error(e);
       Notification.error(i18n('File upload failed: {0}', e.toString()));
     } finally {
diff --git a/packages/ui-default/theme/default.js b/packages/ui-default/theme/default.js
index c8d3dc55..92848f1d 100644
--- a/packages/ui-default/theme/default.js
+++ b/packages/ui-default/theme/default.js
@@ -25,7 +25,6 @@ import 'vj/misc/section.styl';
 import 'vj/misc/nothing.styl';
 import 'vj/components/editor/cmeditor.styl';
 import 'vj/components/datepicker/datepicker.styl';
-import 'vj/components/katex/katex.styl';
 
 // load all page stylesheets
 const pageStyleReq = require.context('../', true, /\.page\.styl$/i);
diff --git a/packages/ui-default/types.ts b/packages/ui-default/types.ts
index 83c51cf2..d414abba 100644
--- a/packages/ui-default/types.ts
+++ b/packages/ui-default/types.ts
@@ -3,4 +3,4 @@ declare let UserContext: any;
 declare let UiContext: any;
 // eslint-disable-next-line camelcase
 declare let node_modules: any;
-declare let LANGS: Record<string, import('@hydrooj/utils/lib/lang').LangConfig>;
+declare let LANGS: Record<string, any>;
diff --git a/packages/ui-default/utils/cloneAttributes.js b/packages/ui-default/utils/cloneAttributes.js
deleted file mode 100644
index e7760a8a..00000000
--- a/packages/ui-default/utils/cloneAttributes.js
+++ /dev/null
@@ -1,6 +0,0 @@
-export default function cloneAttributes(from, to) {
-  const attributes = from.prop('attributes');
-  $.each(attributes, function () {
-    to.attr(this.name, this.value);
-  });
-}
diff --git a/packages/ui-default/utils/parseQueryString.js b/packages/ui-default/utils/parseQueryString.js
deleted file mode 100644
index 5b6859e1..00000000
--- a/packages/ui-default/utils/parseQueryString.js
+++ /dev/null
@@ -1,13 +0,0 @@
-export default function parseQueryString(str) {
-  const obj = {};
-  (str || document.location.search)
-    .replace(/(^\?)/, '')
-    .split('&')
-    .forEach((n) => {
-      const [key, value] = n.split('=').map((v) => decodeURIComponent(v));
-      obj[key] = value;
-    });
-  return obj;
-}
-
-window.Hydro.utils.parseQueryString = parseQueryString;
diff --git a/packages/ui-default/utils/pjax.js b/packages/ui-default/utils/pjax.js
index 7abe08d3..1e4ed20a 100644
--- a/packages/ui-default/utils/pjax.js
+++ b/packages/ui-default/utils/pjax.js
@@ -3,8 +3,8 @@
 
 import $ from 'jquery';
 import { nanoid } from 'nanoid';
+import NProgress from 'nprogress';
 import Notification from 'vj/components/notification';
-import NProgress from 'vj/components/nprogress';
 import request from 'vj/utils/request';
 
 const pjax = {};
diff --git a/packages/ui-default/utils/tpl.ts b/packages/ui-default/utils/tpl.ts
index 21d57487..c0d7d9c7 100644
--- a/packages/ui-default/utils/tpl.ts
+++ b/packages/ui-default/utils/tpl.ts
@@ -1,6 +1,6 @@
 import _ from 'lodash';
 
-type Substitution = string | { templateRaw: true, html: string };
+type Substitution = string | number | { templateRaw: true, html: string };
 
 export default function tpl(pieces: TemplateStringsArray, ...substitutions: Substitution[]) {
   let result = pieces[0];