Lighthouse Mobile

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

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.

Request	Cache TTL	Transfer Size
flux-cdn.com/client/nifty/nifty.min.js	300.0 s	154.0 KiB
/signals/config/1337889004173702?v=2.9.303&r=stable&domai...	1200.0 s	124.9 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.6 KiB
c.amazon-adsystem.com/aax2/apstag.js	3600.0 s	91.0 KiB
/yomiuri/web/image/20260422055108389_20260421-NFP-GYT1I00...	0.0 ms	28.8 KiB
www.nifty.com/_next/static/chunks/framework-de98b93a850cfc71.js	86400.0 s	58.9 KiB
ads.pubmatic.com/AdServer/js/pwt/158115/2581/pwt.js	164353.0 s	75.4 KiB
/yomiuri/web/image/20260422055108304_20260421-NFP-GYT1I00...	0.0 ms	20.9 KiB
/yomiuri/web/image/20260422055108382_20260422-NFP-GYT1I00...	0.0 ms	19.9 KiB
secure.cdn.fastclick.net/js/pubcid/latest/pubcid.min.js	900.0 s	21.7 KiB
/yomiuri/web/image/20260422055108324_20260421-NFP-GYT1I00...	0.0 ms	15.9 KiB
www.nifty.com/_next/static/chunks/main-826563c86547f142.js	86400.0 s	36.5 KiB
www.nifty.com/_next/static/chunks/647-7c3f8414a857c080.js	86400.0 s	34.2 KiB
/yomiuri/web/image/20260422055108331_20260422-NFP-GYT1I00...	0.0 ms	12.9 KiB
/yomiuri/web/image/20260422055108356_20260421-NFP-GYT1I00...	0.0 ms	12.7 KiB
/yomiuri/web/image/20260422055108373_20260421-NFP-GYT1I00...	0.0 ms	11.7 KiB
/yomiuri/web/image/20260422055108340_20260421-NFP-GYT1I00...	0.0 ms	11.2 KiB
/yomiuri/web/image/20260422055108312_20260422-NFP-GYT1I00...	0.0 ms	8.7 KiB
www.nifty.com/_next/static/chunks/pages/_app-d73209869a85c64f.js	86400.0 s	16.6 KiB
tags.crwdcntrl.net/lt/c/16576/sync.min.js	86400.0 s	13.1 KiB
www.nifty.com/_next/static/chunks/169-081777f95b14384c.js	86400.0 s	12.9 KiB
rumcdn.geoedge.be/142d0ade-d148-44ad-9a28-172298579d95/grumi-ip.js	14400.0 s	7.1 KiB
www.nifty.com/_next/static/chunks/pages/smp-81d25a71b56ba734.js	86400.0 s	11.5 KiB
cse.google.com/cse.js?cx=3780ff573e32e4844	0.0 ms	3.9 KiB
www.nifty.com/_next/static/chunks/708-d033ff5b7ac03327.js	86400.0 s	5.8 KiB
www.nifty.com/_next/static/chunks/745-3da54a5ed344b525.js	86400.0 s	5.3 KiB
www.nifty.com/_next/static/css/72762a87ca995ca8.css	86400.0 s	4.2 KiB
config.aps.amazon-adsystem.com/configs/3678	3600.0 s	1.4 KiB
www.google.com/cse/static/style/look/v6/default.css	3000.0 s	1.2 KiB
www.nifty.com/_next/static/chunks/webpack-3260c5964b595564.js	86400.0 s	2.5 KiB
www.nifty.com/_next/static/css/be3e45bbc5357cf3.css	86400.0 s	1.8 KiB
www.nifty.com/_next/static/XNYBA62BZteJxkx7UiA8Y/_buildManifest.js	86400.0 s	1.1 KiB
www.nifty.com/_next/static/XNYBA62BZteJxkx7UiA8Y/_ssgManifest.js	86400.0 s	540 B
/tr/?id=1337889004173702&ev=PageView&dl=https%3A%2F%2Fwww...	0.0 ms	16 B

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.

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:32.063 source:map[column:27 line:14 type:source-location url:https://cse.google.com/cse.js?cx=3780ff573e32e4844 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:29.816 source:map[column:280 line:360 type:source-location url:https://www.google.com/cse/static/element/b33cba5881f68fbf/cse_element__ja.js?usqp=CAI%3D urlProvider:network]] map[reflowTime:1.62 source:map[column:168 line:286 type:source-location url:https://www.google.com/cse/static/element/b33cba5881f68fbf/cse_element__ja.js?usqp=CAI%3D urlProvider:network]] map[reflowTime:0.627 source:map[column:390 line:510 type:source-location url:https://www.google.com/cse/static/element/b33cba5881f68fbf/cse_element__ja.js?usqp=CAI%3D 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.

	URL	Resource Size	Est Savings
行方不明者捜索中の警察官、クマに顔などかまれ重傷…数十ｍ離れた場所に成人女性の遺体 `li.Article_list__TH02x > a.Article_link__VpxiZ > figure.Article_imgFigure__yo7q5 > img.Article_img__rwMZd`	/yomiuri/web/image/20260422055108389_20260421-NFP-GYT1I00...	28.2 KiB	25.0 KiB
陸自戦車４人死傷、砲弾破裂するまで通常通り射撃か…「普通では考えられない」と隊員ら衝撃 `li.Article_list__TH02x > a.Article_link__VpxiZ > figure.Article_imgFigure__yo7q5 > img.Article_img__rwMZd`	/yomiuri/web/image/20260422055108304_20260421-NFP-GYT1I00...	20.3 KiB	17.1 KiB
アット・ニフティ `div.SmpNiftyLogo_item__s2oLF > a > h1 > img`	www.nifty.com/images/organisms/smpHeader/logo_smp_170313.png	16.5 KiB	16.1 KiB
Amazon `a.SmpGeneralDockItem_link__BZS_2 > div.SmpGeneralDockItem_container__1P1WF > div.SmpGeneralDockItem_contentsBody__Irg4J > img.SmpGeneralDockItem_image__3IQQQ`	www.nifty.com/cms_image/niftop/dockSmpNew/191121284343/dock_amazon.png	17.4 KiB	16.0 KiB
ポイント `a.SmpGeneralDockItem_link__BZS_2 > div.SmpGeneralDockItem_container__1P1WF > div.SmpGeneralDockItem_contentsBody__Irg4J > img.SmpGeneralDockItem_image__3IQQQ`	www.nifty.com/images/molecules/smpDock/dock_point.png	17.3 KiB	15.9 KiB
ＮＹダウ終値は２９３ドル安の４万９１４９ドル、２日連続の値下がり…米イランの協議不透明で売り優勢 `li.Article_list__TH02x > a.Article_link__VpxiZ > figure.Article_imgFigure__yo7q5 > img.Article_img__rwMZd`	/yomiuri/web/image/20260422055108382_20260422-NFP-GYT1I00...	19.3 KiB	15.7 KiB
YouTube `a.SmpGeneralDockItem_link__BZS_2 > div.SmpGeneralDockItem_container__1P1WF > div.SmpGeneralDockItem_contentsBody__Irg4J > img.SmpGeneralDockItem_image__3IQQQ`	www.nifty.com/cms_image/niftop/dockSmpNew/150813204327/dock_youtube.png	16.9 KiB	15.5 KiB
Facebook `a.SmpGeneralDockItem_link__BZS_2 > div.SmpGeneralDockItem_container__1P1WF > div.SmpGeneralDockItem_contentsBody__Irg4J > img.SmpGeneralDockItem_image__3IQQQ`	www.nifty.com/cms_image/niftop/dockSmpNew/150813204328/dock_facebook.png	16.5 KiB	15.1 KiB
ブログ `a.SmpGeneralDockItem_link__BZS_2 > div.SmpGeneralDockItem_container__1P1WF > div.SmpGeneralDockItem_contentsBody__Irg4J > img.SmpGeneralDockItem_image__3IQQQ`	www.nifty.com/cms_image/niftop/dockSmpNew/150813204326/dock_cocolog.png	16.2 KiB	14.8 KiB
メール `a.SmpGeneralDockItem_link__BZS_2 > div.SmpGeneralDockItem_container__1P1WF > div.SmpGeneralDockItem_contentsBody__Irg4J > img.SmpGeneralDockItem_image__3IQQQ`	www.nifty.com/images/molecules/smpDock/dock_mail.png	16.1 KiB	14.6 KiB
セカンドメール `a.SmpGeneralDockItem_link__BZS_2 > div.SmpGeneralDockItem_container__1P1WF > div.SmpGeneralDockItem_contentsBody__Irg4J > img.SmpGeneralDockItem_image__3IQQQ`	www.nifty.com/cms_image/niftop/dockSmpNew/150813204325/dock_secondmail.png	16.0 KiB	14.6 KiB
ＡＮＡが国内線「燃油サーチャージ」、２７年度導入検討…燃料高が大幅な収支悪化招くと判断 `li.Article_list__TH02x > a.Article_link__VpxiZ > figure.Article_imgFigure__yo7q5 > img.Article_img__rwMZd`	/yomiuri/web/image/20260422055108324_20260421-NFP-GYT1I00...	15.4 KiB	11.7 KiB
@niftyサンクス抽選会実施中！ `span.SmpWhatsNewDetail_item__T2PZ_ > a > div.SmpWhatsNewDetail_contents__6VivQ > img`	www.nifty.com/cms_image/niftop/memberCampaign/260413377973/120_100.png	12.9 KiB	11.0 KiB
全国のサウナ施設の２割超、非常用のボタンを未設置…「扉の開閉に支障」５％ `li.Article_list__TH02x > a.Article_link__VpxiZ > figure.Article_imgFigure__yo7q5 > img.Article_img__rwMZd`	/yomiuri/web/image/20260422055108331_20260422-NFP-GYT1I00...	12.4 KiB	8.9 KiB
「ふるさと住民登録制度」にＪＡＬ参画へ…大手企業では初、特別マイル付与を想定 `li.Article_list__TH02x > a.Article_link__VpxiZ > figure.Article_imgFigure__yo7q5 > img.Article_img__rwMZd`	/yomiuri/web/image/20260422055108356_20260421-NFP-GYT1I00...	12.2 KiB	8.5 KiB
米軍が拿捕した貨物船はイランと中国を往復、軍民両用品を積載か…中国が継戦能力支える実態浮かぶ `li.Article_list__TH02x > a.Article_link__VpxiZ > figure.Article_imgFigure__yo7q5 > img.Article_img__rwMZd`	/yomiuri/web/image/20260422055108373_20260421-NFP-GYT1I00...	11.2 KiB	7.5 KiB
「後発地震」への備え徹底、「行動変容につながるよう」啓発強化…昨年末は浸透不足が課題に `li.Article_list__TH02x > a.Article_link__VpxiZ > figure.Article_imgFigure__yo7q5 > img.Article_img__rwMZd`	/yomiuri/web/image/20260422055108340_20260421-NFP-GYT1I00...	10.7 KiB	7.1 KiB
キッズ `a.SmpGeneralDockItem_link__BZS_2 > div.SmpGeneralDockItem_container__1P1WF > div.SmpGeneralDockItem_contentsBody__Irg4J > img.SmpGeneralDockItem_image__3IQQQ`	www.nifty.com/cms_image/niftop/dockSmpNew/220715333758/new_kids_bg_dock_sp.png	7.1 KiB	5.7 KiB
バンス米副大統領のパキスタン訪問が保留に、米メディア報道…イランが要求に応じていないことや協議参加を約束していないことが理由 `li.Article_list__TH02x > a.Article_link__VpxiZ > figure.Article_imgFigure__yo7q5 > img.Article_img__rwMZd`	/yomiuri/web/image/20260422055108312_20260422-NFP-GYT1I00...	8.2 KiB	5.1 KiB
占い `a.SmpUranaiDockItem_link__PlSs9 > div.SmpUranaiDockItem_container__PvEKG > div.SmpUranaiDockItem_contentsBody__nPUuE > img.SmpUranaiDockItem_image__12ywY`	www.nifty.com/images/molecules/smpDock/dock_uranai.png	6.1 KiB	4.6 KiB
楽天市場 `a.SmpGeneralDockItem_link__BZS_2 > div.SmpGeneralDockItem_container__1P1WF > div.SmpGeneralDockItem_contentsBody__Irg4J > img.SmpGeneralDockItem_image__3IQQQ`	www.nifty.com/cms_image/niftop/dockSmpNew/181004271504/rakuten_logo_108_100.jpg	5.8 KiB	4.4 KiB

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:2247.807 label:Time to first byte subpart:timeToFirstByte] map[duration:3845.232 label:Element render delay subpart:elementRenderDelay]]

lhId: page-21-P

nodeLabel: Your personal data will be processed and information from your device (cookies,…

path: 1,HTML,1,BODY,15,DIV,1,DIV,1,DIV,0,DIV,0,DIV,4,DIV,0,P

selector: div.fc-dialog-content > div.fc-dialog-scrollable-content > div.fc-footer > p

snippet: <p>

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.

URL	Transfer Size	Duration
www.nifty.com/smp/styles/style.css	15.7 KiB	307 ms
www.nifty.com/smp/styles/search.css?20260219	1.3 KiB
fonts.googleapis.com/css2?family=Noto+Sans+JP&display=swap	30.2 KiB	1.1 s
cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.0.3/cookieconsent.min.css	1.6 KiB	840 ms

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.

URL	Est Savings
/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu...	5.0 ms

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: 2.1 s

URL	Time Spent
nifty.com/	968 ms
www.nifty.com/	1.2 s
www.nifty.com/smp/?top	0.0 ms

Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 981 ms

URL	Time Spent
www.nifty.com/smp/?top	1.1 s

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: 220 ms 8.4 KiB

URL	Transfer Size	Est Savings
fonts.googleapis.com/css2?family=Noto+Sans+JP&display=swap	30.2 KiB	3.1 KiB
www.google.com/cse/static/element/b33cba5881f68fbf/default_v6+ja.css	9.7 KiB	2.8 KiB
www.nifty.com/smp/styles/style.css	15.7 KiB	2.5 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: 480 ms 58.9 KiB

URL	Transfer Size	Est Savings
fonts.googleapis.com/css2?family=Noto+Sans+JP&display=swap	29.8 KiB	29.8 KiB
www.nifty.com/smp/styles/style.css	15.3 KiB	15.1 KiB
.fc-consent-root .fc-dialog-container.fc-fullscreen { height: 100% !important; … } …	16.2 KiB	14.1 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: 3.1 s 796.0 KiB

URL	Transfer Size	Est Savings
/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31...	187.7 KiB	136.9 KiB
flux-cdn.com/client/nifty/nifty.min.js	153.7 KiB	113.6 KiB
/gtm.js?id=GTM-MVZ63P7K&gtm_auth=&gtm_preview=&gtm_cookie...	150.3 KiB	77.0 KiB
www.googletagmanager.com/gtag/js?id=G-FSVG47M7WL&cx=c&gtm=4e64h1	173.5 KiB	70.9 KiB
www.googletagmanager.com/gtag/js?id=G-TC717E9P4D&cx=c&gtm=4e64h1	158.7 KiB	65.2 KiB
www.googletagmanager.com/gtag/js?id=G-1J3H2HEV5N&cx=c&gtm=4e64h1	157.9 KiB	63.5 KiB
www.googletagmanager.com/gtag/js?id=AW-847365261&cx=c&gtm=4e64h1	147.7 KiB	59.5 KiB
/cse/static/element/b33cba5881f68fbf/cse_element__ja.js?u...	98.9 KiB	48.5 KiB
fundingchoicesmessages.google.com/i/62532913?ers=3	68.8 KiB	36.7 KiB
/signals/config/1337889004173702?v=2.9.303&r=stable&domai...	124.8 KiB	35.9 KiB
connect.facebook.net/en_US/fbevents.js	96.5 KiB	34.0 KiB
cse.google.com/adsense/search/async-ads.js	43.3 KiB	31.5 KiB
www.nifty.com/_next/static/chunks/framework-de98b93a850cfc71.js	58.5 KiB	22.8 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.

URL	Total CPU Time	Script Evaluation	Script Parse
www.nifty.com/smp/?top	3.6 s	40 ms	0.8 ms
Unattributable	1.7 s	180 ms	0.0 ms
www.nifty.com/_next/static/chunks/647-7c3f8414a857c080.js	1.2 s	376 ms	24 ms
c.amazon-adsystem.com/aax2/apstag.js	721 ms	624 ms	58 ms
www.nifty.com/_next/static/chunks/framework-de98b93a850cfc71.js	684 ms	578 ms	33 ms
www.googletagmanager.com/gtag/js?id=G-FSVG47M7WL&cx=c&gtm=4e64h1	556 ms	386 ms	86 ms
flux-cdn.com/client/nifty/nifty.min.js	527 ms	410 ms	84 ms
/f/AGSKWxV5CrtdtPU48lrzbSGLXre8U3wj_i1Wf-j1oxmk_jYrL-YVIX...	517 ms	255 ms	81 ms
www.googletagmanager.com/gtag/js?id=AW-847365261&cx=c&gtm=4e64h1	482 ms	410 ms	68 ms
/gtm.js?id=GTM-MVZ63P7K&gtm_auth=&gtm_preview=&gtm_cookie...	472 ms	380 ms	81 ms
www.googletagmanager.com/gtag/js?id=G-TC717E9P4D&cx=c&gtm=4e64h1	469 ms	389 ms	75 ms
/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31...	457 ms	344 ms	104 ms
www.googletagmanager.com/gtag/js?id=G-1J3H2HEV5N&cx=c&gtm=4e64h1	444 ms	369 ms	69 ms
/signals/config/1337889004173702?v=2.9.303&r=stable&domai...	439 ms	374 ms	64 ms
fundingchoicesmessages.google.com/i/62532913?ers=3	404 ms	362 ms	35 ms
cse.google.com/cse.js?cx=3780ff573e32e4844	290 ms	156 ms	2.5 ms
ads.pubmatic.com/AdServer/js/pwt/158115/2581/pwt.js	277 ms	226 ms	43 ms
connect.facebook.net/en_US/fbevents.js	230 ms	166 ms	61 ms
www.nifty.com/_next/static/chunks/main-826563c86547f142.js	169 ms	143 ms	24 ms
www.nifty.com/_next/static/chunks/pages/smp-81d25a71b56ba734.js	161 ms	131 ms	6.9 ms
securepubads.g.doubleclick.net/tag/js/gpt.js	161 ms	136 ms	23 ms
rumcdn.geoedge.be/142d0ade-d148-44ad-9a28-172298579d95/grumi-ip.js	111 ms	105 ms	3.0 ms
secure.cdn.fastclick.net/js/pubcid/latest/pubcid.min.js	108 ms	88 ms	18 ms
/cse/static/element/b33cba5881f68fbf/cse_element__ja.js?u...	104 ms	44 ms	54 ms
rumcdn.geoedge.be/142d0ade-d148-44ad-9a28-172298579d95/grumi.js	95 ms	57 ms	37 ms
cse.google.com/adsense/search/async-ads.js	68 ms	42 ms	20 ms
www.nifty.com/_next/static/chunks/pages/_app-d73209869a85c64f.js	53 ms	42 ms	10 ms
ep2.adtrafficquality.google/sodar/sodar2.js	52 ms	44 ms	3.6 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.

Category	Time Spent
Script Evaluation	7.0 s
Style & Layout	3.5 s
Other	2.4 s
Script Parsing & Compilation	1.2 s
Rendering	289 ms
Parse HTML & CSS	209 ms
Garbage Collection	196 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 reason	Failure 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

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.

URL	Transfer Size
/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31...	187.7 KiB
www.googletagmanager.com/gtag/js?id=G-FSVG47M7WL&cx=c&gtm=4e64h1	173.5 KiB
www.googletagmanager.com/gtag/js?id=G-TC717E9P4D&cx=c&gtm=4e64h1	158.8 KiB
www.googletagmanager.com/gtag/js?id=G-1J3H2HEV5N&cx=c&gtm=4e64h1	158.0 KiB
flux-cdn.com/client/nifty/nifty.min.js	154.0 KiB
/gtm.js?id=GTM-MVZ63P7K&gtm_auth=&gtm_preview=&gtm_cookie...	150.6 KiB
www.googletagmanager.com/gtag/js?id=AW-847365261&cx=c&gtm=4e64h1	147.7 KiB
/signals/config/1337889004173702?v=2.9.303&r=stable&domai...	124.9 KiB
/cse/static/element/b33cba5881f68fbf/cse_element__ja.js?u...	98.9 KiB
connect.facebook.net/en_US/fbevents.js	96.6 KiB

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

●Layout shift culprits

●Optimize DOM size

●Modern HTTP

●Optimize viewport for mobile

●Minify JavaScript

●User Timing marks and measures 25 user timings

●Avoid long main-thread tasks 20 long tasks found

●Image elements have explicit `width` and `height`

●Network Requests

●Network Round Trip Times 20 ms

●Server Backend Latencies 650 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid large layout shifts 6 layout shifts found

○INP breakdown

○LCP request discovery

○Avoid non-composited animations

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.

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
ログイン `div.SmpHeaderItems_headerRightBody__L77SG > ul.SmpHeaderItems_button__o_YZ_ > li > button.SmpHeaderItems_first__E8jSQ`
23 `div.SmpWeatherV2DockItem_container__2n20_ > div.SmpWeatherV2DockItem_contentsBody__aYdbE > div.SmpWeatherV2DockItem_text__NLyXn > span.SmpWeatherV2DockItem_high__9qOC3`
12 `div.SmpWeatherV2DockItem_container__2n20_ > div.SmpWeatherV2DockItem_contentsBody__aYdbE > div.SmpWeatherV2DockItem_text__NLyXn > span.SmpWeatherV2DockItem_low__65pML`
記事提供：読売新聞オンライン `div#__next > div > div.SmpYomiuriNews_titleArea__e2qsz > p.SmpYomiuriNews_offerText__LeM__`
Learn more `div.fc-dialog-content > div.fc-dialog-scrollable-content > button.fc-faq-header > span.fc-faq-label`

These are opportunities to improve the legibility of your content.

Internationalization and localization

If a page doesn't specify a `lang` attribute, a screen reader assumes that the page is in the default language that the user chose when setting up the screen reader. If the page isn't actually in the default language, then the screen reader might not announce the page's text correctly. Learn more about the `lang` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html `html`

These are opportunities to improve the interpretation of your content by users in different locales.

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
サービス一覧\|@nifty光\|ドコモ光 `div#__next > header.SmpHeader_unAuthenticatedCommonHeader__Gg7Tg > div.SmpHeaderLinks_headerLinks__CwB2Z > ul`

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

Best practices

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

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

Source: MDN Permissions-Policy

Failing Elements
head > meta `head > meta`

These items highlight common accessibility best practices.

○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

●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

●`[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

●Form elements have associated labels

●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

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

●Links have a discernible name

●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

●Image elements do not have `[alt]` attributes that are redundant text.

●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 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 a valid value for its `[lang]` attribute

○`<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>`.

○All heading elements contain content.

○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.

Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
会員サポート `div.SmpMemberSupportBanner_container__qqicy > a.SmpMemberSupportBanner_banner__wTKpy > div.SmpMemberSupportBanner_icon-wrapper__Ts9TR > img.SmpMemberSupportBanner_icon___iRzc`	/_next/image?url=%2Fimages%2Fmolecules%2FsmpMemberSupport...	50 x 50 (1.00)	108 x 100 (1.08)

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 / Warning	Source
AttributionReporting	connect.facebook.net/en_US/fbevents.js line 279, col 769

●Uses HTTPS

●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

●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

●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

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

Canonical links suggest which URL to show in search results. Learn more about canonical links.

Why this matters

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

Source: MDN Permissions-Policy

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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`