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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.

25

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
www.yomiuri.co.jp/assets/js/manifest-20260408021058.js86400.0 s576.1 KiB
www.yomiuri.co.jp/assets/css/style-20260408021058.css86400.0 s118.8 KiB
www.yomiuri.co.jp/media/2026/04/20260415-GYT1I00279-T.jpg?type=SP_x-large86400.0 s114.0 KiB
js.hs-analytics.net/analytics/1776294900000/8947762.js300.0 s42.6 KiB
www.yomiuri.co.jp/media/2026/04/20260415-GYT1I00387-T.jpg?type=SP_x-large86400.0 s85.3 KiB
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00097-T.jpg?type=SP_x-large86400.0 s84.0 KiB
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00107-T.jpg?type=SP_x-large86400.0 s81.0 KiB
/27180/69727/poster/content_27180_69727_00001_medium.jpg?...0.0 ms32.4 KiB
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00089-T.jpg?type=SP_x-large86400.0 s75.8 KiB
/27181/69728/poster/content_27181_69728_00010_medium.jpg?...0.0 ms27.4 KiB
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00050-T.jpg?type=SP_x-large86400.0 s68.1 KiB
js.hubspot.com/web-interactives-embed.js600.0 s28.1 KiB
www.yomiuri.co.jp/media/2026/04/20260415-GYT1I00339-T.jpg?type=SP_x-large86400.0 s63.0 KiB
js.hs-banner.com/v2/8947762/banner.js300.0 s25.7 KiB
/27189/69741/poster/content_27189_69741_00008_medium.jpg?...0.0 ms24.5 KiB
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00103-T.jpg?type=SP_x-large86400.0 s60.8 KiB
www.yomiuri.co.jp/assets/libs/npb/Tigers.png86400.0 s57.4 KiB
www.yomiuri.co.jp/images/osusume/digital_top/20260401_5iM8yq.jpg?type=SP_x-large86400.0 s52.9 KiB
www.yomiuri.co.jp/media/2026/04/20260415-GYT1I00472-T.jpg?type=SP_x-large86400.0 s52.0 KiB
pagead2.googlesyndication.com/pagead/js/rum.js3600.0 s25.1 KiB
/27188/69738/poster/content_27188_69738_00008_medium.jpg?...0.0 ms19.3 KiB
www.yomiuri.co.jp/media/2026/04/20260409-GYT8I00012-T.jpg?type=SP_x-large86400.0 s46.8 KiB
/media/2026/04/黒部アルペンルートTT38972-1-scale...86400.0 s46.1 KiB
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00092-T.jpg?type=SP_x-large86400.0 s41.0 KiB
www.yomiuri.co.jp/images/osusume/digital_top/20260413_PPH31m.JPG?type=SP_x-large86400.0 s40.8 KiB
/27191/69744/poster_1776254735_medium.jpg?type=SP_x-large0.0 ms15.9 KiB
www.yomiuri.co.jp/wp-includes/js/jquery/jquery.min.js?ver=3.7.186400.0 s34.8 KiB
www.yomiuri.co.jp/media/2026/04/20260415-GYT1I00319-T.jpg?type=SP_x-large86400.0 s31.6 KiB
www.datadoghq-browser-agent.com/datadog-logs-v4.js14400.0 s18.1 KiB
www.yomiuri.co.jp/images/osusume/digital_top/20260406_4fO2Dd.jpg?type=SP_x-large86400.0 s30.7 KiB
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00105-T.jpg?type=SP_x-large86400.0 s29.5 KiB
/images/osusume/yol_top_webmedia/20260416_RdT9U1.jpg?type...86400.0 s27.7 KiB
yomiuri-8947762.hs-sites.com/_hcms/googlefonts/Inter/700.woff21209600.0 s110.3 KiB
yomiuri-8947762.hs-sites.com/_hcms/googlefonts/Inter/500.woff21209600.0 s109.7 KiB
www.yomiuri.co.jp/images/osusume/digital_top/20260401_DufeeP.jpg?type=SP_x-large86400.0 s26.7 KiB
www.yomiuri.co.jp/assets/libs/npb/Giants.png86400.0 s26.6 KiB
yomiuri-8947762.hs-sites.com/_hcms/googlefonts/Inter/regular.woff21209600.0 s106.2 KiB
scripts.clarity.ms/0.8.60-beta/clarity.js86400.0 s25.0 KiB
/images/osusume/yol_top_webmedia/20260414_9yj0K1.jpg?type...86400.0 s24.8 KiB
js.hubspot.com/web-interactives-container.js600.0 s10.2 KiB
www.yomiuri.co.jp/assets/images/common/dc-com_logo_yol-20260408021058.svg86400.0 s22.6 KiB
/assets/images/common/dc-operationsite_icon_square_yomidr...86400.0 s19.1 KiB
www.yomiuri.co.jp/assets/css/uni-home-2024-20260408021058.css86400.0 s18.8 KiB
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00085-T.jpg?type=SP_x-large86400.0 s18.3 KiB
www.yomiuri.co.jp/media/2026/04/20260415-GYT1I00400-T.jpg?type=SP_x-large86400.0 s18.3 KiB
one.adingo.jp/tag/yomiuri/c43b8f28-3ee5-43e0-9d9a-8dc4628434b8.js600.0 s7.7 KiB
static.chartbeat.com/js/chartbeat.js86400.0 s15.9 KiB
rumcdn.geoedge.be/c8d6b39b-6ad2-4504-b276-3c3157a137f9/grumi-ip.js14400.0 s7.4 KiB
www.yomiuri.co.jp/media/2026/04/20260415-GYT1I00376-T.jpg?type=SP_x-large86400.0 s12.5 KiB
static.chartbeat.com/js/chartbeat_mab.js86400.0 s10.1 KiB
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00101-T.jpg?type=SP_x-large86400.0 s9.7 KiB
/assets/images/common/dc-operationsite_icon_square_otekom...86400.0 s9.3 KiB
/images/osusume/yol_top_webmedia/20251009_lodYp2.jpg?type...86400.0 s8.0 KiB
dmp.im-apps.net/pms/weKLoK1l/pmt.js3600.0 s2.9 KiB
www.yomiuri.co.jp/assets/css/uni-scrap-20260408021058.css86400.0 s5.8 KiB
dmp.im-apps.net/sdk/im-uid.js5294.0 s3.0 KiB
cdn.opecloud.com/ope-mediaconsortium.js604800.0 s17.7 KiB
www.yomiuri.co.jp/assets/js/ajax-contents-20260408021058.js86400.0 s4.0 KiB
/a6eba445-697f-4534-8fe6-10bb360fcb30/launchpad-liveramp.js0.0 ms1.6 KiB
www.yomiuri.co.jp/assets/js/uni-temp_header-20260408021058.js86400.0 s3.8 KiB
www.yomiuri.co.jp/assets/js/ajax-contents-early-warnings-20260408021058.js86400.0 s2.9 KiB
js.hs-scripts.com/8947762.js90.0 s1.1 KiB
www.yomiuri.co.jp/assets/js/sns-share-20260408021058.js86400.0 s2.3 KiB
www.yomiuri.co.jp/assets/js/d-common-20260408021058.js86400.0 s1.7 KiB
www.yomiuri.co.jp/assets/images/yomiuri333/dc-yomiuri333_logo-20260408021058.svg86400.0 s1.6 KiB
www.yomiuri.co.jp/assets/js/partialcontent-20260408021058.js86400.0 s1.5 KiB
www.yomiuri.co.jp/assets/js/p-sidebar-slide-20260408021058.js86400.0 s1.4 KiB
/assets/images/weather/icon/w_s_svg/dc-weather-kumori-t-h...86400.0 s1.3 KiB
cd.ladsp.com/script/pixel2.js864000.0 s5.1 KiB
www.yomiuri.co.jp/assets/libs/slick/css/slick-theme.css86400.0 s1.1 KiB
www.yomiuri.co.jp/assets/js/pimg-20260408021058.js86400.0 s1.1 KiB
www.yomiuri.co.jp/assets/libs/slick/css/slick-base.css86400.0 s1015 B
www.yomiuri.co.jp/assets/js/uni-header-20260408021058.js86400.0 s785 B
www.yomiuri.co.jp/assets/libs/slick/css/slick.css86400.0 s737 B
www.yomiuri.co.jp/assets/libs/consts/consts.js86400.0 s511 B
/set_cookie?ssc_id=01KP9Q0TVJ7TF5N1GFX6M8QJBE&new=one_td_...0.0 ms188 B
www.yomiuri.co.jp/assets/js/p-content-slide-20260408021058.js86400.0 s403 B
www.yomiuri.co.jp/assets/js/pwa-20260408021058.js86400.0 s359 B
www.yomiuri.co.jp/assets/js/uni-news-nav-20260408021058.js86400.0 s337 B
www.yomiuri.co.jp/assets/css/sys-ajax-contents-20260408021058.css86400.0 s259 B
www.yomiuri.co.jp/assets/js/uni-footer-20260408021058.js86400.0 s256 B
www.yomiuri.co.jp/assets/libs/jquery/declare-dollar.js86400.0 s249 B
/hubfs/7052064/hub_generated/module_assets/1/-53649664999...1209600.0 s682 B
www.yomiuri.co.jp/assets/js/ajax-settings-20260408021058.js86400.0 s165 B
www.yomiuri.co.jp/assets/js/uni-home-20260408021058.js86400.0 s117 B
www.datadoghq-browser-agent.com/datadog-logs-v4.js14400.0 s0 B
www.datadoghq-browser-agent.com/datadog-logs-v4.js14400.0 s0 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
/s/roboto/v48/KFOMCnqEu92Fr1ME7kSn66aGLdTylUAMQXC89YmC2DP...5.0 ms
/s/roboto/v48/KFOMCnqEu92Fr1ME7kSn66aGLdTylUAMQXC89YmC2DP...5.0 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:1390.929 source:map[column:59128 line:2 type:source-location url:https://scripts.clarity.ms/0.8.60-beta/clarity.js 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:803.46 source:map[column:55 line:811 type:source-location url:https://www.googletagmanager.com/gtm.js?id=GTM-NTF2JCX urlProvider:network]] map[reflowTime:2.644 source:map[type:text value:[unattributed]]] map[reflowTime:74.405 source:map[column:1096 line:0 type:source-location url:https://www.yomiuri.co.jp/assets/js/p-sidebar-slide-20260408021058.js urlProvider:network]] map[reflowTime:0.217 source:map[column:379 line:0 type:source-location url:https://www.yomiuri.co.jp/assets/js/uni-header-20260408021058.js urlProvider:network]] map[reflowTime:17.847 source:map[column:989151 line:1 type:source-location url:https://www.yomiuri.co.jp/assets/js/manifest-20260408021058.js urlProvider:network]] map[reflowTime:0.655 source:map[column:989869 line:1 type:source-location url:https://www.yomiuri.co.jp/assets/js/manifest-20260408021058.js urlProvider:network]] map[reflowTime:0.457 source:map[column:989927 line:1 type:source-location url:https://www.yomiuri.co.jp/assets/js/manifest-20260408021058.js urlProvider:network]] map[reflowTime:0.332 source:map[column:989991 line:1 type:source-location url:https://www.yomiuri.co.jp/assets/js/manifest-20260408021058.js urlProvider:network]] map[reflowTime:23.613 source:map[column:156 line:0 type:source-location url:https://www.yomiuri.co.jp/assets/js/partialcontent-20260408021058.js urlProvider:network]] map[reflowTime:0.918 source:map[column:86058 line:34 type:source-location url:https://js.hs-analytics.net/analytics/1776294900000/8947762.js urlProvider:network]] map[reflowTime:687.131 source:map[column:449 line:19 type:source-location url:/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads-contributor.ContributorServingResponseClientJs.en_US.WQSjKtkEYiM.es5.O/d=1/exm=kernel_loader,loader_js_executable,monetization_cookie_state_migration_initialization_executable/ed=1/rs=AJlcJMwIx8fty2eKv_YgAn45g2tx1JaJ2w/m=web_iab_tcf_v2_wall_executable urlProvider:network]] map[reflowTime:1390.929 source:map[column:23219 line:1 type:source-location url:https://scripts.clarity.ms/0.8.60-beta/clarity.js urlProvider:network]]]

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
試合前に盛り上がる巨人ファン（３月２７日、東京ドームで）＝片岡航希撮影 figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260415-GYT1I00279-T.jpg?type=SP_x-large113.6 KiB112.2 KiB
安達結希君の自宅を捜索する捜査員ら（１５日午前、京都府南丹市で、読売ヘリから）＝金沢修撮影 figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260415-GYT1I00387-T.jpg?type=SP_x-large85.0 KiB84.0 KiB
ニューヨーク証券取引所 figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00097-T.jpg?type=SP_x-large83.6 KiB82.1 KiB
防衛省 figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00107-T.jpg?type=SP_x-large80.6 KiB79.2 KiB
イラン原子力庁が２０１９年に公開した、中部ナタンツのウラン濃縮施設にある遠心分離器＝ＡＰ figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00050-T.jpg?type=SP_x-large67.7 KiB66.3 KiB
気象を操り、豪雨・台風被害を減らす figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260415-GYT1I00339-T.jpg?type=SP_x-large62.7 KiB61.8 KiB
安達結希君の自宅を調べる捜査員（１５日午前８時７分、京都府南丹市園部町で） figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00089-T.jpg?type=SP_x-large75.4 KiB60.1 KiB
北海道警察本部 figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00103-T.jpg?type=SP_x-large60.5 KiB58.9 KiB
阪神 a > div.p-giants-score__score > div > img
www.yomiuri.co.jp/assets/libs/npb/Tigers.png57.1 KiB57.0 KiB
ＥＮＥＯＳの根岸製油所にある石油精製設備（２０２５年９月、横浜市で） figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260415-GYT1I00472-T.jpg?type=SP_x-large51.5 KiB50.2 KiB
宿泊者専用ラウンジでは、生ビールサーバーだけでなく各種ソフトドリンクも飲み放題 figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260409-GYT8I00012-T.jpg?type=SP_x-large46.6 KiB45.2 KiB
写真・画像 figure > a > picture > img
www.yomiuri.co.jp/images/osusume/digital_top/20260401_5iM8yq.jpg?type=SP_x-large52.6 KiB44.3 KiB
「アジア・ゼロエミッション共同体」のオンライン首脳会合後、報道陣の取材に応じる高市首相（１５日、首相官邸で）＝木佐貫冬星撮影 figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00092-T.jpg?type=SP_x-large40.8 KiB39.9 KiB
figure > a > picture > img figure > a > picture > img
/media/2026/04/黒部アルペンルートTT38972-1-scale...45.7 KiB39.9 KiB
写真・画像 figure > a > picture > img
www.yomiuri.co.jp/images/osusume/digital_top/20260413_PPH31m.JPG?type=SP_x-large40.5 KiB33.3 KiB
武石知華さん。事故前日の３月１５日に宿泊先で撮影し、知華さんが家族に共有した写真という＝投稿サイト「ｎｏｔｅ」より figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260415-GYT1I00319-T.jpg?type=SP_x-large31.3 KiB30.7 KiB
大谷翔平＝ＡＰ figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00105-T.jpg?type=SP_x-large29.2 KiB28.4 KiB
写真・画像 figure > a > picture > img
/images/osusume/yol_top_webmedia/20260416_RdT9U1.jpg?type...27.4 KiB26.8 KiB
巨人 a > div.p-giants-score__score > div > img
www.yomiuri.co.jp/assets/libs/npb/Giants.png26.2 KiB26.1 KiB
写真・画像 figure > a > picture > img
www.yomiuri.co.jp/images/osusume/digital_top/20260406_4fO2Dd.jpg?type=SP_x-large30.5 KiB25.0 KiB
写真・画像 figure > a > picture > img
/images/osusume/yol_top_webmedia/20260414_9yj0K1.jpg?type...24.5 KiB24.0 KiB
写真・画像 figure > a > picture > img
/27180/69727/poster/content_27180_69727_00001_medium.jpg?...32.0 KiB22.6 KiB
写真・画像 figure > a > picture > img
www.yomiuri.co.jp/images/osusume/digital_top/20260401_DufeeP.jpg?type=SP_x-large26.5 KiB21.7 KiB
写真・画像 figure > a > picture > img
/27181/69728/poster/content_27181_69728_00010_medium.jpg?...27.1 KiB17.7 KiB
写真・画像 figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260415-GYT1I00400-T.jpg?type=SP_x-large18.0 KiB17.6 KiB
くたに・いちろう　１９９５年、早大院理工学研究科修了。日本鋼管、ＪＦＥエンジニアリングを経て、２００７年入所。アジアを中心とした世界のエネルギー市場とエネルギ… figure > a > picture > img
www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00085-T.jpg?type=SP_x-large18.1 KiB17.5 KiB
写真・画像 figure > a > picture > img
/27189/69741/poster/content_27189_69741_00008_medium.jpg?...24.2 KiB14.8 KiB
写真・画像 figure > a > picture > img
/27188/69738/poster/content_27188_69738_00008_medium.jpg?...18.9 KiB9.6 KiB
div.info > div.p-feature-tags > a.p-feature-tags__item > ::before div.info > div.p-feature-tags > a.p-feature-tags__item > ::before
/assets/images/common/dc-operationsite_icon_square_yomidr...18.8 KiB8.1 KiB
写真・画像 figure > a > picture > img
/27191/69744/poster_1776254735_medium.jpg?type=SP_x-large15.6 KiB6.2 KiB

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-6-IMG
nodeLabel: 安達結希君の自宅を調べる捜査員（１５日午前８時７分、京都府南丹市園部町で）
path: 1,HTML,1,BODY,3,DIV,0,DIV,3,MAIN,0,DIV,4,SECTION,1,DIV,0,DIV,0,DIV,0,DIV,2,FIGURE,0,A,0,PICTURE,1,IMG
selector: figure > a > picture > img
snippet: <img decoding="async" src="https://www.yomiuri.co.jp/media/2026/04/20260416-GYT1I00089-T.jpg?type=SP_…" alt="安達結希君の自宅を調べる捜査員（１５日午前８時７分、京都府南丹市園部町で）" loading="eager" pinger-seen="true">

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
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
www.yomiuri.co.jp/assets/js/manifest-20260408021058.js576.1 KiB3.0 s
www.yomiuri.co.jp/assets/libs/jquery/declare-dollar.js249 B
www.yomiuri.co.jp/assets/libs/consts/consts.js511 B
www.yomiuri.co.jp/assets/libs/slick/css/slick-theme.css1.1 KiB
www.yomiuri.co.jp/wp-includes/js/jquery/jquery.min.js?ver=3.7.134.8 KiB151 ms
www.yomiuri.co.jp/assets/css/style-20260408021058.css118.8 KiB1.5 s
www.yomiuri.co.jp/assets/css/uni-home-2024-20260408021058.css18.8 KiB151 ms
www.yomiuri.co.jp/assets/css/sys-ajax-contents-20260408021058.css259 B
www.yomiuri.co.jp/assets/libs/slick/css/slick-base.css1015 B
www.yomiuri.co.jp/assets/css/uni-scrap-20260408021058.css5.8 KiB
www.yomiuri.co.jp/assets/js/pwa-20260408021058.js359 B
www.yomiuri.co.jp/assets/libs/slick/css/slick.css737 B
one.adingo.jp/tag/yomiuri/c43b8f28-3ee5-43e0-9d9a-8dc4628434b8.js7.7 KiB916 ms

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

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.

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: 752 ms
URLTime Spent
yomiuri.co.jp/752 ms
www.yomiuri.co.jp/0.0 ms

Diagnostics

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: 600 ms 136.1 KiB
URLTransfer SizeEst Savings
www.yomiuri.co.jp/assets/css/style-20260408021058.css118.7 KiB109.9 KiB
.fc-consent-root .fc-dialog-container.fc-fullscreen { height: 100% !important; … } …16.2 KiB14.1 KiB
www.yomiuri.co.jp/assets/css/uni-home-2024-20260408021058.css18.6 KiB12.2 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: 4.1 s 899.2 KiB
URLTransfer SizeEst Savings
www.yomiuri.co.jp/assets/js/manifest-20260408021058.js575.5 KiB549.6 KiB
/pagead/managed/js/gpt/m202604100101/pubads_impl.js186.4 KiB129.7 KiB
www.googletagmanager.com/gtag/js?id=G-YY4F97M831&cx=c&gtm=4e64e1157.8 KiB64.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-NTF2JCX159.5 KiB50.0 KiB
fundingchoicesmessages.google.com/i/51343015?ers=369.1 KiB36.3 KiB
www.yomiuri.co.jp/wp-includes/js/jquery/jquery.min.js?ver=3.7.134.6 KiB25.6 KiB
securepubads.g.doubleclick.net/tag/js/gpt.js34.3 KiB23.8 KiB
launchpad.privacymanager.io/latest/launchpad.bundle.js45.0 KiB20.0 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
/f/AGSKWxWM1VFaTGDrAurChv1mVOi5dMuIO-Cr6wqHvGqfTk_wHFYfmz...6.0 s261 ms67 ms
www.yomiuri.co.jp/4.9 s86 ms24 ms
www.googletagmanager.com/gtm.js?id=GTM-NTF2JCX4.4 s961 ms110 ms
scripts.clarity.ms/0.8.60-beta/clarity.js3.1 s290 ms11 ms
Unattributable1.5 s32 ms0.0 ms
js.hs-analytics.net/analytics/1776294900000/8947762.js1.4 s1.0 s17 ms
/pagead/managed/js/gpt/m202604100101/pubads_impl.js767 ms588 ms145 ms
www.googletagmanager.com/gtag/js?id=G-YY4F97M831&cx=c&gtm=4e64e1475 ms397 ms72 ms
one.adingo.jp/tag/yomiuri/c43b8f28-3ee5-43e0-9d9a-8dc4628434b8.js457 ms435 ms7.7 ms
www.yomiuri.co.jp/assets/js/manifest-20260408021058.js431 ms106 ms198 ms
fundingchoicesmessages.google.com/i/51343015?ers=3391 ms347 ms34 ms
www.yomiuri.co.jp/assets/js/p-sidebar-slide-20260408021058.js325 ms21 ms0.8 ms
www.yomiuri.co.jp/wp-includes/js/jquery/jquery.min.js?ver=3.7.1202 ms82 ms14 ms
rumcdn.geoedge.be/c8d6b39b-6ad2-4504-b276-3c3157a137f9/grumi-ip.js197 ms168 ms3.6 ms
pagead2.googlesyndication.com/pagead/js/rum.js181 ms158 ms10 ms
securepubads.g.doubleclick.net/tag/js/gpt.js180 ms122 ms56 ms
js.hubspot.com/web-interactives-embed.js179 ms154 ms15 ms
static.chartbeat.com/js/chartbeat.js121 ms111 ms6.5 ms
rumcdn.geoedge.be/c8d6b39b-6ad2-4504-b276-3c3157a137f9/grumi.js111 ms64 ms46 ms
www.datadoghq-browser-agent.com/datadog-logs-v4.js110 ms71 ms24 ms
launchpad.privacymanager.io/latest/launchpad.bundle.js81 ms41 ms38 ms
/ssc-ym-client.v2.0.js?endpoint=https%3A%2F%2Fssc.one.yom...79 ms73 ms2.4 ms
www.yomiuri.co.jp/assets/css/style-20260408021058.css63 ms0.0 ms0.0 ms
/a6eba445-697f-4534-8fe6-10bb360fcb30/launchpad-liveramp.js61 ms58 ms0.8 ms
static.chartbeat.com/js/chartbeat_mab.js58 ms47 ms5.9 ms
www.yomiuri.co.jp/assets/js/uni-temp_header-20260408021058.js54 ms42 ms2.7 ms
cdn.opecloud.com/ope-mediaconsortium.js52 ms35 ms14 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
Style & Layout15.9 s
Script Evaluation8.1 s
Other2.0 s
Script Parsing & Compilation960 ms
Rendering619 ms
Parse HTML & CSS455 ms
Garbage Collection284 ms

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reasonFailure type
Pages with cache-control:no-store header cannot enter back/forward cache.Actionable
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.Not actionable
Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header.Not actionable

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: 0.0 ms 14.2 KiB
URLTransfer SizeEst Savings
launchpad.privacymanager.io/latest/launchpad.bundle.js45.0 KiB14.2 KiB

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
www.yomiuri.co.jp/assets/js/manifest-20260408021058.js576.1 KiB
/pagead/managed/js/gpt/m202604100101/pubads_impl.js186.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-NTF2JCX160.4 KiB
www.googletagmanager.com/gtag/js?id=G-YY4F97M831&cx=c&gtm=4e64e1157.8 KiB
www.yomiuri.co.jp/121.0 KiB
www.yomiuri.co.jp/assets/css/style-20260408021058.css118.8 KiB
www.yomiuri.co.jp/media/2026/04/20260415-GYT1I00279-T.jpg?type=SP_x-large114.0 KiB
yomiuri-8947762.hs-sites.com/_hcms/googlefonts/Inter/700.woff2110.3 KiB
yomiuri-8947762.hs-sites.com/_hcms/googlefonts/Inter/500.woff2109.7 KiB
yomiuri-8947762.hs-sites.com/_hcms/googlefonts/Inter/regular.woff2106.2 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
阪神 a > div.p-giants-score__score > div > img
www.yomiuri.co.jp/assets/libs/npb/Tigers.png
巨人 a > div.p-giants-score__score > div > img
www.yomiuri.co.jp/assets/libs/npb/Giants.png
読売新聞オンライン div.logo > h1 > a > img
www.yomiuri.co.jp/assets/images/common/dc-com_logo_yol-20260408021058.svg
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
li > figure > a > img li > figure > a > img
div.image > figure > a > img div.image > figure > a > img

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

●Layout shift culprits
●Optimize DOM size
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●User Timing marks and measures 7 user timings
●Avoid long main-thread tasks 20 long tasks found
●Network Requests
●Network Round Trip Times 230 ms
●Server Backend Latencies 660 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 0 ms
●Avoid large layout shifts 2 layout shifts found
○INP breakdown
○Avoid non-composited animations
84

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

ARIA dialog elements without accessible names may prevent screen readers users from discerning the purpose of these elements. Learn how to make ARIA dialog elements more accessible.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
Popup CTA body.home > div#hs-web-interactives-top-anchor > div#hs-overlay-cta-190219231302

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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
+52.47 div.data > dl.data-list > dd > span.increase
08:05 div.list > div.item > div.info > time.new
07:39 div.list > div.item > div.info > time.new
07:31 div.list > div.item > div.info > time.new
06:55 div.list > div.item > div.info > time
06:50 div.list > div.item > div.info > time
06:41 div.list > div.item > div.info > time
06:05 div.list > div.item > div.info > time
06:00 div.list > div.item > div.info > time
05:20 div.list > div.item > div.info > time
05:00 div.list > div.item > div.info > time
02:39 div.list__group > div.item > div.info > time
08:05 div.list__group > div.item > div.info > time.new
06:55 div.list__group > div.item > div.info > time.new
07:39 div.list__group > div.item > div.info > time.new
06:41 div.list__group > div.item > div.info > time.new
2026/04/15 13:00 div.list__group > div.item > div.info > time
2026/04/15 19:00 div.list__group > div.item > div.info > time
05:00 div.list__group > div.item > div.info > time.new
05:00 div.list__group > div.item > div.info > time.new
2026/04/15 05:00 div.list__group > div.item > div.info > time
05:00 div.list__group > div.item > div.info > time.new
05:00 div.list__group > div.item > div.info > time.new
05:00 div.local-all > div.item > div.info > time
05:00 div.local-all > div.item > div.info > time
06:30 div.list__group > div.item > div.info > time.new
10:25 div.list__group > div.item > div.info > time
05:00 div.list__group > div.item > div.info > time
05:00 div.list__group > div.item > div.info > time.new
05:00 div.list__group > div.item > div.info > time.new
05:00 div.list__group > div.item > div.info > time.new
07:30 div.list__group > div.item > div.info > time.new
05:00 div.list__group > div.item > div.info > time
05:00 div.list__group > div.item > div.info > time
05:00 div.list__group > div.item > div.info > time.new
2026/04/10 div.list__group > div.item > div.info > time
2026/04/10 div.list__group > div.item > div.info > time
2026/04/10 div.list__group > div.item > div.info > time
Learn more div.fc-dialog-content > div.fc-dialog-scrollable-content > button.fc-faq-header > span.fc-faq-label
List of partners. div.fc-dialog-scrollable-content > div.fc-footer > p > a.fc-vendors-list-dialog

These are opportunities to improve the legibility of your content.

Names and labels

Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more about form element labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input
div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input div.p-sidebar-slide__controller > div.p-sidebar-slide__controller-dots > label > input

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.list__group > div.item > div.info > a.tag div.list__group > div.item > div.info > a.tag
div.list__group > div.item > figure > a div.list__group > div.item > figure > a
div.home-shimen__contents > div.image > figure > a div.home-shimen__contents > div.image > figure > a
div.p-sidebar-slide__list-set > div.p-sidebar-slide__list-item > figure > a div.p-sidebar-slide__list-set > div.p-sidebar-slide__list-item > figure > a
div.p-sidebar-slide__list-set > div.p-sidebar-slide__list-item > figure > a div.p-sidebar-slide__list-set > div.p-sidebar-slide__list-item > figure > a
div.p-sidebar-slide__list-set > div.p-sidebar-slide__list-item > figure > a div.p-sidebar-slide__list-set > div.p-sidebar-slide__list-item > figure > a
div.home-special-b__contents > div.item > figure > a div.home-special-b__contents > div.item > figure > a
div.home-special-b__contents > div.item > figure > a div.home-special-b__contents > div.item > figure > a

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.

Tables and lists

Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.home-l-main__sidebar > section.home-present > div.fn-sidebar-member-present > ul.p-sidebar-member-present-list div.home-l-main__sidebar > section.home-present > div.fn-sidebar-member-present > ul.p-sidebar-member-present-list
div.home-l-main__sidebar > section.home-coupon > div.p-sidebar-coupon-2020 > ul div.home-l-main__sidebar > section.home-coupon > div.p-sidebar-coupon-2020 > ul

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

○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
●Image elements have `[alt]` attributes
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●Select elements have associated label elements.
●ARIA attributes are used as specified for the element's role
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
●Definition list items are wrapped in `<dl>` elements
●Document has a `<title>` element
●`<frame>` or `<iframe>` elements have a title
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Uses ARIA roles only on compatible elements
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○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
○ARIA IDs are unique
○No form fields have multiple labels
○`<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
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○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>`.
○All heading elements contain content.
○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.
100

Best Practices

General

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLMap URL
www.yomiuri.co.jp/assets/js/manifest-20260408021058.js
launchpad.privacymanager.io/latest/launchpad.bundle.jslaunchpad.privacymanager.io/latest/launchpad.bundle.js.map
●Uses HTTPS
●Avoids deprecated APIs
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Displays images with correct aspect ratio
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No browser errors logged to the console
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
○Redirects HTTP traffic to HTTPS
○Use a strong HSTS policy
○Mitigate clickjacking with XFO or CSP
100

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.

○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
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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