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Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

31

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/17...3600.0 s193.8 KiB
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
connect.facebook.net/zh_TW/bundle/sdk.js/1200.0 s77.9 KiB
/signals/config/351257012036020?v=2.9.303&r=stable&domain...1200.0 s44.8 KiB
www.google-analytics.com/analytics.js7200.0 s20.9 KiB
static.criteo.net/js/ld/publishertag.prebid.js86400.0 s31.3 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/03/20...3600.0 s12.1 KiB
udn.com/static/js/vendor.bundle.js?202604201435691200.0 s85.9 KiB
p.udn.com.tw/upf/static/common/prebid4.35.0_20210415.js1209600.0 s70.7 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...691200.0 s56.4 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...691200.0 s53.1 KiB
connect.facebook.net/zh_TW/sdk.js#xfbml=1&version=v5.0&appId=3502312151261011200.0 s5.0 KiB
udn.com/static/img/udn-loading.png691200.0 s39.9 KiB
udn.com/static/img/udn-loading.webp691200.0 s37.3 KiB
sb.scorecardresearch.com/internal-cs/default/beacon-and.js86400.0 s7.8 KiB
udn.com/static/css/index.css?202604201435691200.0 s29.9 KiB
udn.com/static/js/index.bundle.js?202604201435691200.0 s29.9 KiB
/43NkSywDNJr3hLs7eh-TCw9KeQYnVvKuAqLtv5OQzIOtOGg3ZTJL3gGI...86400.0 s6.5 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...691200.0 s22.0 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...691200.0 s21.1 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...691200.0 s18.1 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/03/12...691200.0 s18.0 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...691200.0 s18.0 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/03/30...691200.0 s17.5 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...691200.0 s16.8 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...691200.0 s15.7 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...691200.0 s15.4 KiB
p.udn.com.tw/upf/static/common/udn-fingerprint.umd.js?121209600.0 s15.2 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...691200.0 s14.5 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/20...691200.0 s14.3 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...691200.0 s13.1 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...691200.0 s12.3 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...691200.0 s12.1 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...691200.0 s12.1 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...691200.0 s12.0 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...691200.0 s11.3 KiB
pm-widget.taboola.com/udntw2-udnmobile/load.js3600.0 s1.4 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...691200.0 s11.1 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...691200.0 s10.5 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...691200.0 s10.2 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...691200.0 s10.1 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...691200.0 s9.3 KiB
d.line-scdn.net/r/web/social-plugin/js/thirdparty/loader.min.js73681.0 s2.0 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...691200.0 s8.3 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...691200.0 s8.2 KiB
p.udn.com.tw/upf/static/common/recommendation/recommendation-system.js1209600.0 s7.8 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...691200.0 s6.7 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...691200.0 s6.3 KiB
udn.com/static/js/lit-html.bundle.js?tsb=1770016465782691200.0 s6.0 KiB
udn.com/static/js/google-dfp-native.js?202604201435691200.0 s5.0 KiB
p.udn.com.tw/upf/static/common/ab-test-grouping.js1209600.0 s3.4 KiB
udn.com/static/img/logo.svg?2020020601691200.0 s3.1 KiB
udn.com/static/img/logo.svg?20200206691200.0 s3.1 KiB
udn.com/static/js/utils_head.bundle.js?202604201435691200.0 s3.0 KiB
udn.com/static/js/webcomponents-template.bundle.js?tsb=1770016465782691200.0 s2.8 KiB
udn.com/upf/static/common/md5.js?1691200.0 s2.3 KiB
udn.com/static/css/google-dfp-native.css?202604201435691200.0 s2.2 KiB
udn.com/static/js/firebase.js?t=2025010202691200.0 s2.1 KiB
udn.com/upf/static/svg-icons/google-news.svg691200.0 s2.0 KiB
udn.com/upf/static/svg-icons/threads-round.svg691200.0 s1.3 KiB
udn.com/static/js/vendor_head.bundle.js?202604201435691200.0 s1.1 KiB
udn.com/upf/news/2024/orange_logo_2024.svg691200.0 s1.0 KiB
udn.com/static/js/firebase-config.js691200.0 s971 B
udn.com/upf/static/svg-icons/horn.svg691200.0 s884 B
/tr/?id=351257012036020&ev=PageView&dl=https%3A%2F%2Fudn....0.0 ms16 B

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLEst Savings
/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu...25 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:67.743 source:map[column:197 line:761 type:source-location url:https://www.googletagmanager.com/gtm.js?id=GTM-5CMHR66 urlProvider:network]]]
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:53.082 source:map[type:text value:[unattributed]]] map[reflowTime:32.391 source:map[column:21 line:5219 type:source-location url:https://udn.com/news/index urlProvider:network]] map[reflowTime:4.656 source:map[column:32466 line:1 type:source-location url:https://udn.com/static/js/index.bundle.js?202604201435 urlProvider:network]] map[reflowTime:7.259 source:map[column:155210 line:1 type:source-location url:https://udn.com/static/js/index.bundle.js?202604201435 urlProvider:network]] map[reflowTime:5.739 source:map[column:63325 line:1 type:source-location url:https://udn.com/static/js/index.bundle.js?202604201435 urlProvider:network]] map[reflowTime:0.287 source:map[column:103194 line:1 type:source-location url:https://udn.com/static/js/index.bundle.js?202604201435 urlProvider:network]] map[reflowTime:137.244 source:map[column:21165 line:1 type:source-location url:https://p.udn.com.tw/upf/static/common/udn-fingerprint.umd.js?12 urlProvider:network]] map[reflowTime:0.276 source:map[column:8466 line:1 type:source-location url:https://p.udn.com.tw/upf/static/common/udn-fingerprint.umd.js?12 urlProvider:network]] map[reflowTime:67.743 source:map[column:55 line:758 type:source-location url:https://www.googletagmanager.com/gtm.js?id=GTM-5CMHR66 urlProvider:network]] map[reflowTime:86.725 source:map[column:449 line:19 type:source-location url:/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads-contributor.ContributorServingResponseClientJs.en_US.DsKGN-qqfrQ.es5.O/d=1/exm=kernel_loader,loader_js_executable/ed=1/rs=AJlcJMz2YRLcgcQw7bN4By8dD3CBlNJULw/m=web_iab_tcf_v2_wall_executable urlProvider:network]]]

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]
items: [map[duration:365.715 label:Time to first byte subpart:timeToFirstByte] map[duration:1293.984 label:Resource load delay subpart:resourceLoadDelay] map[duration:142.496 label:Resource load duration subpart:resourceLoadDuration] map[duration:737.035 label:Element render delay subpart:elementRenderDelay]]
lhId: page-0-IMG
nodeLabel: div.slide-section > a.slide-image > picture > img.lazyload
path: 1,HTML,1,BODY,12,MAIN,0,DIV,6,SECTION,7,DIV,0,SECTION,0,SECTION,0,DIV,0,A,0,PICTURE,4,IMG
selector: div.slide-section > a.slide-image > picture > img.lazyload
snippet: <img src="https://pgw.udn.com.tw/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/…" loading="lazy" alt="" class="lazyload">

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG
nodeLabel: div.slide-section > a.slide-image > picture > img.lazyload
path: 1,HTML,1,BODY,12,MAIN,0,DIV,6,SECTION,7,DIV,0,SECTION,0,SECTION,0,DIV,0,A,0,PICTURE,4,IMG
selector: div.slide-section > a.slide-image > picture > img.lazyload
snippet: <img src="https://pgw.udn.com.tw/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/…" loading="lazy" alt="" class="lazyload">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
value: no origins were preconnected
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer SizeDuration
s.udn.com.tw/static/font-icons/css/fontello.css?20260420143511.4 KiB1.2 s
s.udn.com.tw/static/font-icons/css/animation.css?2026042014352.6 KiB827 ms
udn.com/static/js/vendor_head.bundle.js?2026042014351.1 KiB150 ms
udn.com/static/js/google-dfp-native.js?2026042014355.0 KiB150 ms
udn.com/static/js/utils_head.bundle.js?2026042014353.0 KiB300 ms
udn.com/upf/static/common/md5.js?12.3 KiB150 ms
udn.com/static/css/index.css?20260420143529.9 KiB900 ms
udn.com/static/css/google-dfp-native.css?2026042014352.2 KiB

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
a.focus-list > div.focus-list__image > picture > img a.focus-list > div.focus-list__image > picture > img
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/17...193.6 KiB191.6 KiB
section.slide-holder > section.slide > div.slide-section > ::after section.slide-holder > section.slide > div.slide-section > ::after
udn.com/static/img/udn-loading.png39.7 KiB38.1 KiB
div.slide-section > a.slide-image > picture > img.lazyload div.slide-section > a.slide-image > picture > img.lazyload
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...56.0 KiB37.8 KiB
div.slide-section > a.slide-image > picture > img.lazyload div.slide-section > a.slide-image > picture > img.lazyload
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...52.9 KiB30.3 KiB
div.story-list__image > a.story-list__image--holder > picture > img div.story-list__image > a.story-list__image--holder > picture > img
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...21.9 KiB19.9 KiB
div.story-list__image > a.story-list__image--holder > picture > img div.story-list__image > a.story-list__image--holder > picture > img
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...18.0 KiB16.0 KiB
a.focus-list > div.focus-list__image > picture > img a.focus-list > div.focus-list__image > picture > img
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/03/12...17.8 KiB15.9 KiB
div.story-list__image > a.story-list__image--holder > picture > img div.story-list__image > a.story-list__image--holder > picture > img
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...17.6 KiB15.7 KiB
a.focus-list > div.focus-list__image > picture > img a.focus-list > div.focus-list__image > picture > img
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/03/30...17.2 KiB15.3 KiB
div.story-list__image > a.story-list__image--holder > picture > img div.story-list__image > a.story-list__image--holder > picture > img
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...16.6 KiB14.7 KiB
div.story-list__image > a.story-list__image--holder > picture > img div.story-list__image > a.story-list__image--holder > picture > img
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...15.2 KiB6.2 KiB
div.story-list__image > a.story-list__image--holder > picture > img div.story-list__image > a.story-list__image--holder > picture > img
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...14.2 KiB5.1 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 765 ms
URLTime Spent
udn.com/765 ms
udn.com/news/index0.0 ms

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 170 ms 10.3 KiB
URLTransfer SizeEst Savings
/css?family=Noto+Sans+TC:300,400,500&display=swap&subset=...98.1 KiB10.3 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 150 ms 16.1 KiB
URLTransfer SizeEst Savings
www.gstatic.com/firebasejs/10.13.1/firebase-app.js22.2 KiB13.1 KiB
p.udn.com.tw/upf/static/common/recommendation/recommendation-system.js7.5 KiB3.0 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 770 ms 131.5 KiB
URLTransfer SizeEst Savings
/css?family=Noto+Sans+TC:300,400,500&display=swap&subset=...97.6 KiB97.6 KiB
udn.com/static/css/index.css?20260420143529.7 KiB20.0 KiB
.fc-consent-root .fc-dialog-container.fc-fullscreen { height: 100% !important; … } …16.2 KiB13.9 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 4.9 s 841.3 KiB
URLTransfer SizeEst Savings
cdn.taboola.com/libtrc/udntw2-udnmobile/loader.js319.3 KiB206.4 KiB
/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31...187.7 KiB129.7 KiB
www.googletagmanager.com/gtag/js?id=G-7THXRBK2CK&cx=c&gtm=4e64h1164.3 KiB66.5 KiB
www.googletagmanager.com/gtag/js?id=G-NEBRGBLTFZ&cx=c&gtm=4e64h1145.0 KiB62.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-NVJVL2N141.2 KiB60.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-5CMHR66151.7 KiB57.0 KiB
connect.facebook.net/zh_TW/bundle/sdk.js/77.8 KiB53.9 KiB
udn.com/static/js/vendor.bundle.js?20260420143585.7 KiB47.2 KiB
p.udn.com.tw/upf/static/common/prebid4.35.0_20210415.js70.4 KiB42.6 KiB
fundingchoicesmessages.google.com/i/103512698?ers=368.8 KiB36.3 KiB
connect.facebook.net/en_US/fbevents.js96.5 KiB33.2 KiB
static.criteo.net/js/ld/publishertag.prebid.js30.9 KiB23.5 KiB
udn.com/static/js/index.bundle.js?20260420143529.6 KiB22.7 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTotal CPU TimeScript EvaluationScript Parse
udn.com/news/index1.5 s66 ms23 ms
/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31...1.0 s935 ms54 ms
p.udn.com.tw/upf/static/common/udn-fingerprint.umd.js?12840 ms197 ms2.6 ms
Unattributable813 ms27 ms0.0 ms
/f/AGSKWxV3Mk1iK2t5LtPi3ksA3oEohCsE7gXwEAiF7RUHULMCxpSftc...761 ms272 ms57 ms
connect.facebook.net/zh_TW/bundle/sdk.js/668 ms649 ms18 ms
www.googletagmanager.com/gtm.js?id=GTM-5CMHR66554 ms226 ms53 ms
pm-widget.taboola.com/udntw2-udnmobile/pmk-20220605.5.js429 ms419 ms6.7 ms
www.googletagmanager.com/gtm.js?id=GTM-NVJVL2N320 ms242 ms39 ms
udn.com/static/js/index.bundle.js?202604201435298 ms209 ms16 ms
cdn.taboola.com/libtrc/udntw2-udnmobile/loader.js290 ms178 ms112 ms
www.googletagmanager.com/gtag/js?id=G-7THXRBK2CK&cx=c&gtm=4e64h1224 ms187 ms35 ms
fundingchoicesmessages.google.com/i/103512698?ers=3188 ms172 ms14 ms
p.udn.com.tw/upf/static/common/prebid4.35.0_20210415.js149 ms123 ms17 ms
www.googletagmanager.com/gtag/js?id=G-NEBRGBLTFZ&cx=c&gtm=4e64h1131 ms102 ms28 ms
/signals/config/351257012036020?v=2.9.303&r=stable&domain...105 ms92 ms13 ms
connect.facebook.net/en_US/fbevents.js105 ms79 ms25 ms
securepubads.g.doubleclick.net/tag/js/gpt.js69 ms59 ms9.1 ms
udn.com/static/js/lit-html.bundle.js?tsb=177001646578251 ms46 ms2.6 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation4.4 s
Style & Layout2.3 s
Other1.0 s
Script Parsing & Compilation567 ms
Parse HTML & CSS197 ms
Rendering177 ms
Garbage Collection133 ms

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
cdn.taboola.com/libtrc/udntw2-udnmobile/loader.js319.9 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/17...193.8 KiB
/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31...187.7 KiB
www.googletagmanager.com/gtag/js?id=G-7THXRBK2CK&cx=c&gtm=4e64h1164.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-5CMHR66152.1 KiB
www.googletagmanager.com/gtag/js?id=G-NEBRGBLTFZ&cx=c&gtm=4e64h1145.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-NVJVL2N141.3 KiB
/css?family=Noto+Sans+TC:300,400,500&display=swap&subset=...98.1 KiB
udn.com/static/img/favicon.ico97.6 KiB
connect.facebook.net/en_US/fbevents.js96.6 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
section.main-index__focus > div.vip-edn--promotion > a.icon-orange > img section.main-index__focus > div.vip-edn--promotion > a.icon-orange > img
udn.com/upf/news/2024/orange_logo_2024.svg

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits
●Document request latency
●Optimize DOM size
●Modern HTTP
●Optimize viewport for mobile
●User Timing marks and measures 12 user timings
●Avoid long main-thread tasks 20 long tasks found
●Avoid non-composited animations 1 animated element found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 50 ms
●Server Backend Latencies 200 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 360 ms
○INP breakdown
○Avoid large layout shifts
80

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

ARIA

When an element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn how to make command elements more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.udn-slider > section.slider-controls > section.slider-dot > span div.udn-slider > section.slider-controls > section.slider-dot > span

Using ARIA attributes in roles where they are prohibited can mean that important information is not communicated to users of assistive technologies. Learn more about prohibited ARIA roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
submit-search section.overlay-menu > div.container > div.input-holder > span.btn

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
整理／大甲媽要遶境了！必看進香路線、禁忌 section.main-index__focus > div.focus > a.focus-list > h4.focus-list__title

These are opportunities to improve keyboard navigation in your application.

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
section.header-wrapper > div.logo > a > img section.header-wrapper > div.logo > a > img
section.header-wrapper > div.logo > a > img section.header-wrapper > div.logo > a > img
section.main-index__focus > div.vip-edn--promotion > a.icon-orange > img section.main-index__focus > div.vip-edn--promotion > a.icon-orange > img
section.main-index__focus > div.udn-channel--promotion > a.icon-vip > img section.main-index__focus > div.udn-channel--promotion > a.icon-vip > img
section.main-index__focus > div.udn-channel--promotion > a.icon-money > img section.main-index__focus > div.udn-channel--promotion > a.icon-money > img
section.main-index__focus > div.udn-channel--promotion > a.icon-orange > img section.main-index__focus > div.udn-channel--promotion > a.icon-orange > img

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder
div.feature-guess__list > div.story-list__text > h3 > a div.feature-guess__list > div.story-list__text > h3 > a
div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder
div.feature-guess__list > div.story-list__text > h3 > a div.feature-guess__list > div.story-list__text > h3 > a
div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder
div.feature-guess__list > div.story-list__text > h3 > a div.feature-guess__list > div.story-list__text > h3 > a
div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder
div.feature-guess__list > div.story-list__text > h3 > a div.feature-guess__list > div.story-list__text > h3 > a
div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder
div.feature-guess__list > div.story-list__text > h3 > a div.feature-guess__list > div.story-list__text > h3 > a
div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder
div.feature-guess__list > div.story-list__text > h3 > a div.feature-guess__list > div.story-list__text > h3 > a
footer.footer > div.container > section.footer-social > a.btn footer.footer > div.container > section.footer-social > a.btn
footer.footer > div.container > section.footer-social > a.btn footer.footer > div.container > section.footer-social > a.btn
footer.footer > div.container > section.footer-social > a.btn footer.footer > div.container > section.footer-social > a.btn
footer.footer > div.container > section.footer-social > a.btn footer.footer > div.container > section.footer-social > a.btn
footer.footer > div.container > section.footer-social > a.btn footer.footer > div.container > section.footer-social > a.btn

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
車訊 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
轉角國際 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
女子漾 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
房市 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
Oops div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
運動 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
Oops div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
社會 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
Oops div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
雜誌 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
旅遊 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
社會 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
股市 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
股市 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
地方 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
全球 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
要聞 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
運動 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate
運動 div.story-list__news > div.story-list__text > div.story-list__info > a.story-list__cate

These items highlight common accessibility best practices.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
訂閱 div.container > section.footer-social > form.newsletter > button.btn
訂閱 div.container > section.footer-social > form.newsletter > button.btn
○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●ARIA attributes are used as specified for the element's role
●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Document has a main landmark.
●Deprecated ARIA roles were not used
●All heading elements contain content.
●Uses ARIA roles only on compatible elements
●Identical links have the same purpose.
○`[accesskey]` values are unique
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[role]`s are contained by their required parent element
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○Links are distinguishable without relying on color.
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○Image elements do not have `[alt]` attributes that are redundant text.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
73

Best Practices

Trust and Safety

Users are mistrustful of or confused by sites that request to send notifications without context. Consider tying the request to user gestures instead. Learn more about responsibly getting permission for notifications.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Source
udn.com/static/js/firebase.js?t=2025010202 line 34, col 13

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / WarningSource
AttributionReporting
connect.facebook.net/en_US/fbevents.js line 279, col 769
Specifying overflow: visible on img, video and canvas tags may cause them to produce visual content outside of the element bounds. See https://github.com/WICG/shared-element-transitions/blob/main/debugging_overflow_on_images.md.
/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads... line 19, col 449

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
p.udn.com.tw/upf/static/common/prebid4.35.0_20210415.js line 3, col 13853
%cPrebid display: inline-block; color: #fff; background: #3b88c3; padding: 1px 4px; border-radius: 3px; ERROR: Server call for aol failed: . Continuing without bids.
p.udn.com.tw/upf/static/common/prebid4.35.0_20210415.js line 3, col 13853
%cPrebid display: inline-block; color: #fff; background: #3b88c3; padding: 1px 4px; border-radius: 3px; ERROR: Server call for aol failed: . Continuing without bids.
p.udn.com.tw/upf/static/common/prebid4.35.0_20210415.js line 3, col 13853
%cPrebid display: inline-block; color: #fff; background: #3b88c3; padding: 1px 4px; border-radius: 3px; ERROR: Server call for aol failed: . Continuing without bids.
udn.com/news/index
Access to XMLHttpRequest at 'https://c2shb.ssp.yahoo.com/bidRequest?dcn=8a969162017373e3f4b2fb08e6a00704&pos=udn_pc_right2_300x250_display_hb&cmd=bid&secure=1' from origin 'https://udn.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
udn.com/news/index
Access to XMLHttpRequest at 'https://c2shb.ssp.yahoo.com/bidRequest?dcn=8a969162017373e3f4b2fb08e6a00704&pos=udn_pc_right3_300x250_display_hb&cmd=bid&secure=1' from origin 'https://udn.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
udn.com/news/index
Access to XMLHttpRequest at 'https://c2shb.ssp.yahoo.com/bidRequest?dcn=8a969162017373e3f4b2fb08e6a00704&pos=udn_pc_right4_300x250_display_hb&cmd=bid&secure=1' from origin 'https://udn.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
/bidRequest?dcn=8a969162017373e3f4b2fb08e6a00704&pos=udn_...
Failed to load resource: net::ERR_FAILED
/bidRequest?dcn=8a969162017373e3f4b2fb08e6a00704&pos=udn_...
Failed to load resource: net::ERR_FAILED
/bidRequest?dcn=8a969162017373e3f4b2fb08e6a00704&pos=udn_...
Failed to load resource: net::ERR_FAILED
udn.com/news/index line 176, col 15
TypeError: Cannot read properties of undefined (reading 'split') at https://udn.com/news/index:177:16
●Uses HTTPS
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Displays images with correct aspect ratio
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
92

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
section.header-wrapper > div.logo > a > img section.header-wrapper > div.logo > a > img
section.header-wrapper > div.logo > a > img section.header-wrapper > div.logo > a > img
section.main-index__focus > div.vip-edn--promotion > a.icon-orange > img section.main-index__focus > div.vip-edn--promotion > a.icon-orange > img
section.main-index__focus > div.udn-channel--promotion > a.icon-vip > img section.main-index__focus > div.udn-channel--promotion > a.icon-vip > img
section.main-index__focus > div.udn-channel--promotion > a.icon-money > img section.main-index__focus > div.udn-channel--promotion > a.icon-money > img
section.main-index__focus > div.udn-channel--promotion > a.icon-orange > img section.main-index__focus > div.udn-channel--promotion > a.icon-orange > img

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●robots.txt is valid
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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