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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
rs.sakura.ad.jp/resource/assets/fonts/NotoSansJP-VariableFont_wght.woff260.0 s1.2 MiB
/public/cta/54089/16679d91-28f8-4e6b-880b-0ed745aca0f9.png0.0 ms401.5 KiB
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
/column/wp-content/uploads/2025/09/ドメイン名の解...60.0 s65.3 KiB
rs.sakura.ad.jp/assets/images/home/event-seminar/thumb-204.webp0.0 ms55.7 KiB
rs.sakura.ad.jp/assets/images/home/event-seminar/thumb-203.webp0.0 ms55.2 KiB
/column/wp-content/uploads/2025/10/Gmailに届かない...60.0 s51.7 KiB
/column/wp-content/uploads/2025/08/巧妙化し増え続...60.0 s40.8 KiB
/signals/config/1254127229730586?v=2.9.303&r=stable&domai...1200.0 s44.5 KiB
rs.sakura.ad.jp/assets/images/home/illust-hero.svg60.0 s19.2 KiB
cs.nakanohito.jp/b3/bi.js10800.0 s20.7 KiB
/signals/config/1935121863416672?v=2.9.303&r=stable&domai...1200.0 s16.0 KiB
rs.sakura.ad.jp/assets/scripts/vendor/splide/js/splide.min.js60.0 s13.1 KiB
rs.sakura.ad.jp/assets/images/home/img-about-03.avif0.0 ms11.6 KiB
rs.sakura.ad.jp/assets/styles/style.css60.0 s11.6 KiB
s.yimg.jp/images/listing/tool/cv/ytag.js600.0 s11.8 KiB
rs.sakura.ad.jp/assets/images/home/img-hero-agency.avif0.0 ms10.2 KiB
statics.a8.net/a8sales/a8sales.js0.0 ms9.7 KiB
rs.sakura.ad.jp/assets/images/common/img-document.avif0.0 ms7.3 KiB
rs.sakura.ad.jp/assets/images/home/bg-archivement.svg60.0 s5.8 KiB
rs.sakura.ad.jp/assets/images/common/bg-trial-sp.avif0.0 ms5.4 KiB
rs.sakura.ad.jp/assets/images/home/img-about-04.avif0.0 ms5.3 KiB
rs.sakura.ad.jp/assets/images/home/img-about-02.avif0.0 ms5.1 KiB
rs.sakura.ad.jp/assets/images/home/img-about-01.avif0.0 ms5.0 KiB
statics.a8.net/a8sales/a8crossDomain.js0.0 ms4.4 KiB
rs.sakura.ad.jp/assets/images/common/logo.svg60.0 s4.3 KiB
rs.sakura.ad.jp/assets/images/common/img-transfer.svg60.0 s4.2 KiB
rs.sakura.ad.jp/assets/styles/home.css60.0 s4.1 KiB
rs.sakura.ad.jp/resource/assets/styles/style.css60.0 s4.0 KiB
rs.sakura.ad.jp/assets/images/home/img-hero-support.avif0.0 ms3.9 KiB
rs.sakura.ad.jp/assets/images/home/img-hero-plan.avif0.0 ms3.5 KiB
rs.sakura.ad.jp/assets/images/common/img-startup.avif0.0 ms3.2 KiB
rs.sakura.ad.jp/assets/scripts/script.js60.0 s3.2 KiB
rs.sakura.ad.jp/assets/scripts/home.js60.0 s2.9 KiB
rs.sakura.ad.jp/assets/scripts/information.js60.0 s1.8 KiB
rs.sakura.ad.jp/assets/images/home/icon-add.svg60.0 s1.3 KiB
rs.sakura.ad.jp/assets/images/common/icons/icon-youtube.svg60.0 s1.2 KiB
munchkin.marketo.net/munchkin-beta.js0.0 ms1.1 KiB
rs.sakura.ad.jp/assets/images/home/icon-start.svg60.0 s1.1 KiB
rs.sakura.ad.jp/assets/scripts/price.js60.0 s980 B
rs.sakura.ad.jp/assets/images/home/icon-plan.svg60.0 s958 B
rs.sakura.ad.jp/assets/images/home/icon-card.svg60.0 s859 B
rs.sakura.ad.jp/assets/images/common/icons/icon-x.svg60.0 s857 B
/tr/?id=1254127229730586&ev=PageView&dl=https%3A%2F%2Frs....0.0 ms19 B
/tr/?id=1935121863416672&ev=PageView&dl=https%3A%2F%2Frs....0.0 ms16 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.14568199999999998] map[node:map[boundingRect:map[bottom:997 height:331 left:16 right:396 top:666 width:380] lhId:page-3-DIV nodeLabel:最適なプランを診断しよう 簡単な質問に答えるだけで、あなたにぴったりなプランをご案内いたします。 詳細を見る 取次店制度 お取り次ぎいただいた件数やプ… path:1,HTML,1,BODY,4,MAIN,0,DIV,1,DIV selector:body > main.home-main > div.hero > div.hero-card snippet:<div class="hero-card l-inner"> type:node] score:0.068462 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:417 height:127 left:65 right:347 top:290 width:283] lhId:page-38-IMG nodeLabel:div.hero-head > div.l-inner > figure.hero-figure > img path:1,HTML,1,BODY,4,MAIN,0,DIV,0,DIV,0,DIV,1,FIGURE,0,IMG selector:div.hero-head > div.l-inner > figure.hero-figure > img snippet:<img src="assets/images/home/illust-hero.svg" alt=""> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:2436 height:1439 left:0 right:412 top:997 width:412] lhId:page-2-SECTION nodeLabel:安心・安定の さくらのレンタルサーバ 多くの方に選ばれています お客さまに合わせた多彩なプラン 多種多様なお客さまの利用用途に合わせ、さくらのレンタルサーバ… path:1,HTML,1,BODY,4,MAIN,1,SECTION selector:body > main.home-main > section.l-section snippet:<section class="l-section about"> type:node] score:0.048366] map[node:map[boundingRect:map[bottom:496 height:206 left:16 right:396 top:290 width:380] lhId:page-5-FIGURE nodeLabel:ご利用件数 56万件 突破 東証プライム市場 上場企業 運営 サーバー稼働率 99.99% 以上 path:1,HTML,1,BODY,4,MAIN,0,DIV,0,DIV,0,DIV,1,FIGURE selector:div.hero > div.hero-head > div.l-inner > figure.hero-figure snippet:<figure class="hero-figure"> type:node] score:0.028854 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:417 height:127 left:65 right:347 top:290 width:283] lhId:page-38-IMG nodeLabel:div.hero-head > div.l-inner > figure.hero-figure > img path:1,HTML,1,BODY,4,MAIN,0,DIV,0,DIV,0,DIV,1,FIGURE,0,IMG selector:div.hero-head > div.l-inner > figure.hero-figure > img snippet:<img src="assets/images/home/illust-hero.svg" alt=""> type:node]]] type:subitems]]]
headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.049268000000000006] map[node:map[boundingRect:map[bottom:823 height:161 left:0 right:412 top:662 width:412] lhId:page-6-DIV nodeLabel:閉じる path:1,HTML,1,BODY,25,DIV selector:body > div#gtm-popup-plan_mail_202604_popup snippet:<div id="gtm-popup-plan_mail_202604_popup" class="gtm-popup plan_mail_202604_popup is-visible" style="display: block; opacity: 1;"> type:node] score:0.040141 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:822 height:159 left:55 right:358 top:663 width:303] lhId:page-0-IMG nodeLabel:【ビジネスメールプラン登場】IPアドレス専有でメール到達率向上！ path:1,HTML,1,BODY,25,DIV,0,DIV,1,A,1,IMG selector:div#gtm-popup-plan_mail_202604_popup > div.popup-content > a.popup-link > img.popup-img-sp snippet:<img src="https://ui-storage.userlocal.jp/public/cta/54089/16679d91-28f8-4e6b-880b-0…" alt="【ビジネスメールプラン登場】IPアドレス専有でメール到達率向上！" class="popup-img-sp"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:208 height:51 left:157 right:367 top:157 width:210] lhId:page-7-STRONG nodeLabel:成長し続ける path:1,HTML,1,BODY,4,MAIN,0,DIV,0,DIV,0,DIV,0,DIV,1,H1,0,SPAN,2,STRONG selector:div.hero-text > h1.hero-headline > span.hero-headline-inner > strong snippet:<strong> type:node] score:0.009127 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:417 height:127 left:65 right:347 top:290 width:283] lhId:page-38-IMG nodeLabel:div.hero-head > div.l-inner > figure.hero-figure > img path:1,HTML,1,BODY,4,MAIN,0,DIV,0,DIV,0,DIV,1,FIGURE,0,IMG selector:div.hero-head > div.l-inner > figure.hero-figure > img snippet:<img src="assets/images/home/illust-hero.svg" alt=""> type:node]] map[cause:Web font extra:map[type:url value:https://rs.sakura.ad.jp/resource/assets/fonts/NotoSansJP-VariableFont_wght.woff2]]] type:subitems]]]

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:19.153 source:map[column:24 line:3 type:source-location url:https://rs.sakura.ad.jp/assets/scripts/home.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:0.34 source:map[column:85 line:2 type:source-location url: urlProvider:network]] map[reflowTime:30.505 source:map[column:2269 line:7 type:source-location url:https://rs.sakura.ad.jp/assets/scripts/vendor/splide/js/splide.min.js urlProvider:network]] map[reflowTime:3.304 source:map[column:25 line:39 type:source-location url:https://rs.sakura.ad.jp/assets/scripts/home.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
【ビジネスメールプラン登場】IPアドレス専有でメール到達率向上！ div#gtm-popup-plan_mail_202604_popup > div.popup-content > a.popup-link > img.popup-img-sp
/public/cta/54089/16679d91-28f8-4e6b-880b-0ed745aca0f9.png401.1 KiB377.0 KiB
a.c-card-link > figure.link-figure > picture > img a.c-card-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/home/event-seminar/thumb-203.webp54.7 KiB47.1 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:1577.047 label:Time to first byte subpart:timeToFirstByte] map[duration:1375.791 label:Resource load delay subpart:resourceLoadDelay] map[duration:1989.68 label:Resource load duration subpart:resourceLoadDuration] map[duration:18.255 label:Element render delay subpart:elementRenderDelay]]
lhId: page-0-IMG
nodeLabel: 【ビジネスメールプラン登場】IPアドレス専有でメール到達率向上！
path: 1,HTML,1,BODY,25,DIV,0,DIV,1,A,1,IMG
selector: div#gtm-popup-plan_mail_202604_popup > div.popup-content > a.popup-link > img.popup-img-sp
snippet: <img src="https://ui-storage.userlocal.jp/public/cta/54089/16679d91-28f8-4e6b-880b-0…" alt="【ビジネスメールプラン登場】IPアドレス専有でメール到達率向上！" class="popup-img-sp">

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: 【ビジネスメールプラン登場】IPアドレス専有でメール到達率向上！
path: 1,HTML,1,BODY,25,DIV,0,DIV,1,A,1,IMG
selector: div#gtm-popup-plan_mail_202604_popup > div.popup-content > a.popup-link > img.popup-img-sp
snippet: <img src="https://ui-storage.userlocal.jp/public/cta/54089/16679d91-28f8-4e6b-880b-0…" alt="【ビジネスメールプラン登場】IPアドレス専有でメール到達率向上！" class="popup-img-sp">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
rs.sakura.ad.jp/http/1.1
rs.sakura.ad.jp/resource/assets/styles/style.csshttp/1.1
rs.sakura.ad.jp/assets/styles/style.csshttp/1.1
rs.sakura.ad.jp/assets/styles/home.csshttp/1.1
rs.sakura.ad.jp/assets/scripts/information.jshttp/1.1
rs.sakura.ad.jp/assets/images/common/logo.svghttp/1.1
rs.sakura.ad.jp/assets/images/home/illust-hero.svghttp/1.1
rs.sakura.ad.jp/assets/images/home/img-hero-support.avifhttp/1.1
rs.sakura.ad.jp/assets/images/home/img-hero-plan.avifhttp/1.1
rs.sakura.ad.jp/assets/images/home/img-hero-agency.avifhttp/1.1
rs.sakura.ad.jp/assets/images/home/img-about-01.avifhttp/1.1
rs.sakura.ad.jp/assets/images/home/img-about-02.avifhttp/1.1
rs.sakura.ad.jp/assets/images/home/img-about-03.avifhttp/1.1
rs.sakura.ad.jp/assets/images/home/img-about-04.avifhttp/1.1
rs.sakura.ad.jp/assets/images/home/icon-plan.svghttp/1.1
rs.sakura.ad.jp/assets/images/home/icon-add.svghttp/1.1
rs.sakura.ad.jp/assets/images/home/icon-card.svghttp/1.1
rs.sakura.ad.jp/assets/images/home/icon-start.svghttp/1.1
rs.sakura.ad.jp/assets/images/common/img-transfer.svghttp/1.1
rs.sakura.ad.jp/assets/images/common/img-startup.avifhttp/1.1
rs.sakura.ad.jp/assets/images/common/img-document.avifhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-x.svghttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-youtube.svghttp/1.1
rs.sakura.ad.jp/assets/scripts/vendor/splide/js/splide.min.jshttp/1.1
rs.sakura.ad.jp/assets/scripts/home.jshttp/1.1
rs.sakura.ad.jp/assets/scripts/price.jshttp/1.1
rs.sakura.ad.jp/assets/scripts/script.jshttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-price-list.svg#price-listhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-server.svg#serverhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-biz.svg#bizhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-managed.svg#managedhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-mail.svg#mailhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-function-list.svg#function-listhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-cdn.svg#cdnhttp/1.1
/assets/images/common/icons/icon-backup-staging.svghttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-free-ssl.svg#free-sslhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-mail-filter.svg#mail-filterhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-support-list.svg#support-listhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-beginner.svg#beginnerhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-transfer.svg#transferhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-apply.svg#applyhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-contract.svg#contracthttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-solution.svg#solutionhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-members.svg#memberhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-enterprise.svg#enterprisehttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-dkim.svg#dkimhttp/1.1
rs.sakura.ad.jp/assets/images/common/icons/icon-scaleup.svg#scaleuphttp/1.1
rs.sakura.ad.jp/resource/assets/images/logo-white.svg#logohttp/1.1
rs.sakura.ad.jp/assets/images/home/bg-archivement.svghttp/1.1
rs.sakura.ad.jp/assets/images/common/bg-trial-sp.avifhttp/1.1
rs.sakura.ad.jp/resource/assets/fonts/NotoSansJP-VariableFont_wght.woff2http/1.1
rs.sakura.ad.jp/column/wp-json/wp/v2/posts/http/1.1
rs.sakura.ad.jp/assets/json/event-seminar.jsonhttp/1.1
rs.sakura.ad.jp/assets/json/plan-price.jsonhttp/1.1
rs.sakura.ad.jp/maint/api/v1/feeds/?type=minorinfohttp/1.1
rs.sakura.ad.jp/column/wp-json/wp/v2/media/3339http/1.1
rs.sakura.ad.jp/column/wp-json/wp/v2/media/3323http/1.1
rs.sakura.ad.jp/column/wp-json/wp/v2/media/3293http/1.1
/column/wp-content/uploads/2025/10/Gmailに届かない...http/1.1
/column/wp-content/uploads/2025/09/ドメイン名の解...http/1.1
/column/wp-content/uploads/2025/08/巧妙化し増え続...http/1.1
rs.sakura.ad.jp/assets/images/home/event-seminar/thumb-203.webphttp/1.1
rs.sakura.ad.jp/assets/images/home/event-seminar/thumb-204.webphttp/1.1

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
rs.sakura.ad.jp/assets/scripts/information.js1.8 KiB1.2 s
rs.sakura.ad.jp/assets/styles/home.css4.1 KiB1.2 s
rs.sakura.ad.jp/assets/styles/style.css11.6 KiB1.2 s
rs.sakura.ad.jp/resource/assets/styles/style.css4.0 KiB410 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: 1.5 s
URLTime Spent
www.sakura.ne.jp/1.5 s
rs.sakura.ad.jp/0.0 ms

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
最適なプランを診断しよう 簡単な質問に答えるだけで、あなたにぴったりなプランをご案内いたします。 詳細を見る 取次店制度 お取り次ぎいただいた件数やプ… body > main.home-main > div.hero > div.hero-card
0.068
安心・安定の さくらのレンタルサーバ 多くの方に選ばれています お客さまに合わせた多彩なプラン 多種多様なお客さまの利用用途に合わせ、さくらのレンタルサーバ… body > main.home-main > section.l-section
0.048
閉じる body > div#gtm-popup-plan_mail_202604_popup
0.040
ご利用件数 56万件 突破 東証プライム市場 上場企業 運営 サーバー稼働率 99.99% 以上 div.hero > div.hero-head > div.l-inner > figure.hero-figure
0.029
成長し続ける div.hero-text > h1.hero-headline > span.hero-headline-inner > strong
0.009

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: 480 ms 4.0 KiB
URLTransfer SizeEst Savings
rs.sakura.ad.jp/assets/styles/style.css11.6 KiB4.0 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: 2.5 s 480.7 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-1JCLR3N1HE&cx=c&gtm=4e64k0h2176.3 KiB70.6 KiB
www.googletagmanager.com/gtag/js?id=G-RY0M78YRM0&cx=c&gtm=4e64k0h2172.3 KiB68.9 KiB
www.googletagmanager.com/gtag/js?id=G-M3MLBH78ML&cx=c&gtm=4e64k0h2177.9 KiB67.3 KiB
www.googletagmanager.com/gtag/js?id=G-7VHJVBXPZ3&cx=c&gtm=4e64k0h2159.5 KiB64.6 KiB
www.googletagmanager.com/gtag/js?id=AW-17304125414&cx=c&gtm=4e64k0h2143.4 KiB61.8 KiB
www.googletagmanager.com/gtag/js?id=AW-985956116&cx=c&gtm=4e64k0h2145.5 KiB61.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-NL8DR22187.8 KiB52.1 KiB
connect.facebook.net/en_US/fbevents.js96.5 KiB34.2 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
rs.sakura.ad.jp/1.7 s12 ms1.3 ms
Unattributable1.1 s45 ms0.0 ms
www.googletagmanager.com/gtm.js?id=GTM-NL8DR22735 ms608 ms75 ms
www.googletagmanager.com/gtag/js?id=G-M3MLBH78ML&cx=c&gtm=4e64k0h2362 ms303 ms56 ms
www.googletagmanager.com/gtag/js?id=AW-985956116&cx=c&gtm=4e64k0h2347 ms304 ms41 ms
www.googletagmanager.com/gtag/js?id=AW-17304125414&cx=c&gtm=4e64k0h2312 ms244 ms46 ms
www.googletagmanager.com/gtag/js?id=G-1JCLR3N1HE&cx=c&gtm=4e64k0h2279 ms224 ms51 ms
www.googletagmanager.com/gtag/js?id=G-RY0M78YRM0&cx=c&gtm=4e64k0h2263 ms216 ms42 ms
www.googletagmanager.com/gtag/js?id=G-7VHJVBXPZ3&cx=c&gtm=4e64k0h2256 ms214 ms40 ms
rs.sakura.ad.jp/assets/scripts/home.js203 ms63 ms0.9 ms
connect.facebook.net/en_US/fbevents.js168 ms96 ms36 ms
rs.sakura.ad.jp/assets/scripts/script.js149 ms48 ms1.1 ms
/signals/config/1254127229730586?v=2.9.303&r=stable&domai...139 ms116 ms22 ms
/signals/config/1935121863416672?v=2.9.303&r=stable&domai...60 ms47 ms9.9 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 Evaluation2.6 s
Style & Layout1.4 s
Other1.3 s
Script Parsing & Compilation461 ms
Rendering269 ms
Garbage Collection91 ms
Parse HTML & CSS69 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
rs.sakura.ad.jp/resource/assets/fonts/NotoSansJP-VariableFont_wght.woff21.2 MiB
/public/cta/54089/16679d91-28f8-4e6b-880b-0ed745aca0f9.png401.5 KiB
rs.sakura.ad.jp/column/wp-json/wp/v2/posts/307.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-NL8DR22188.2 KiB
www.googletagmanager.com/gtag/js?id=G-M3MLBH78ML&cx=c&gtm=4e64k0h2178.6 KiB
www.googletagmanager.com/gtag/js?id=G-1JCLR3N1HE&cx=c&gtm=4e64k0h2176.4 KiB
www.googletagmanager.com/gtag/js?id=G-RY0M78YRM0&cx=c&gtm=4e64k0h2172.4 KiB
www.googletagmanager.com/gtag/js?id=G-7VHJVBXPZ3&cx=c&gtm=4e64k0h2159.6 KiB
www.googletagmanager.com/gtag/js?id=AW-985956116&cx=c&gtm=4e64k0h2145.6 KiB
www.googletagmanager.com/gtag/js?id=AW-17304125414&cx=c&gtm=4e64k0h2143.4 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
li#splide04-clone01 > a.c-card-link > figure.link-figure > img li#splide04-clone01 > a.c-card-link > figure.link-figure > img
/column/wp-content/uploads/2025/09/ドメイン名の解...
li#splide04-slide01 > a.c-card-link > figure.link-figure > img li#splide04-slide01 > a.c-card-link > figure.link-figure > img
/column/wp-content/uploads/2025/10/Gmailに届かない...
li#splide04-slide02 > a.c-card-link > figure.link-figure > img li#splide04-slide02 > a.c-card-link > figure.link-figure > img
/column/wp-content/uploads/2025/09/ドメイン名の解...
li#splide04-clone03 > a.c-card-link > figure.link-figure > img li#splide04-clone03 > a.c-card-link > figure.link-figure > img
/column/wp-content/uploads/2025/10/Gmailに届かない...
li#splide04-clone04 > a.c-card-link > figure.link-figure > img li#splide04-clone04 > a.c-card-link > figure.link-figure > img
/column/wp-content/uploads/2025/09/ドメイン名の解...
li#splide04-clone02 > a.c-card-link > figure.link-figure > img li#splide04-clone02 > a.c-card-link > figure.link-figure > img
/column/wp-content/uploads/2025/08/巧妙化し増え続...
li#splide04-slide03 > a.c-card-link > figure.link-figure > img li#splide04-slide03 > a.c-card-link > figure.link-figure > img
/column/wp-content/uploads/2025/08/巧妙化し増え続...
【ビジネスメールプラン登場】IPアドレス専有でメール到達率向上！ div#gtm-popup-plan_mail_202604_popup > div.popup-content > a.popup-link > img.popup-img-sp
/public/cta/54089/16679d91-28f8-4e6b-880b-0ed745aca0f9.png
div.hero-head > div.l-inner > figure.hero-figure > img div.hero-head > div.l-inner > figure.hero-figure > img
rs.sakura.ad.jp/assets/images/home/illust-hero.svg
div.l-inner > div.c-box-link > figure.link-figure > img div.l-inner > div.c-box-link > figure.link-figure > img
rs.sakura.ad.jp/assets/images/common/img-transfer.svg
div.c-box-link > figure.link-figure > picture > img div.c-box-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/common/img-startup.avif
div.c-box-link > figure.link-figure > picture > img div.c-box-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/common/img-document.avif
a.c-card-link > figure.link-figure > picture > img a.c-card-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/home/event-seminar/thumb-203.webp
a.c-card-link > figure.link-figure > picture > img a.c-card-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/home/event-seminar/thumb-204.webp
a.c-card-link > figure.link-figure > picture > img a.c-card-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/home/event-seminar/thumb-203.webp
a.c-card-link > figure.link-figure > picture > img a.c-card-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/home/event-seminar/thumb-204.webp
a.c-card-link > figure.link-figure > picture > img a.c-card-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/home/event-seminar/thumb-203.webp
a.c-card-link > figure.link-figure > picture > img a.c-card-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/home/event-seminar/thumb-204.webp
a.c-card-link > figure.link-figure > picture > img a.c-card-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/home/img-hero-plan.avif
a.c-card-link > figure.link-figure > picture > img a.c-card-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/home/img-hero-agency.avif
a.c-card-link > figure.link-figure > picture > img a.c-card-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/home/img-hero-support.avif
a.c-card-link > figure.link-figure > picture > img a.c-card-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/home/img-hero-plan.avif
a.c-card-link > figure.link-figure > picture > img a.c-card-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/home/img-hero-agency.avif
a.c-card-link > figure.link-figure > picture > img a.c-card-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/home/img-hero-support.avif
a.c-card-link > figure.link-figure > picture > img a.c-card-link > figure.link-figure > picture > img
rs.sakura.ad.jp/assets/images/home/img-hero-plan.avif
div.about-item > figure.about-figure > picture > img div.about-item > figure.about-figure > picture > img
rs.sakura.ad.jp/assets/images/home/img-about-01.avif
div.about-item > figure.about-figure > picture > img div.about-item > figure.about-figure > picture > img
rs.sakura.ad.jp/assets/images/home/img-about-02.avif
div.about-item > figure.about-figure > picture > img div.about-item > figure.about-figure > picture > img
rs.sakura.ad.jp/assets/images/home/img-about-03.avif
div.about-item > figure.about-figure > picture > img div.about-item > figure.about-figure > picture > img
rs.sakura.ad.jp/assets/images/home/img-about-04.avif
さくらのレンタルサーバ div.header-inner > div.header-pannel > a.header-logo > img
rs.sakura.ad.jp/assets/images/common/logo.svg
さくらのレンタルサーバ div.footer-service-head > div.footer-service-logo > a > img
rs.sakura.ad.jp/assets/images/common/logo.svg
ul.flow-list > li > figure.flow-figure > img ul.flow-list > li > figure.flow-figure > img
rs.sakura.ad.jp/assets/images/home/icon-plan.svg
ul.flow-list > li > figure.flow-figure > img ul.flow-list > li > figure.flow-figure > img
rs.sakura.ad.jp/assets/images/home/icon-add.svg
ul.flow-list > li > figure.flow-figure > img ul.flow-list > li > figure.flow-figure > img
rs.sakura.ad.jp/assets/images/home/icon-card.svg
ul.flow-list > li > figure.flow-figure > img ul.flow-list > li > figure.flow-figure > img
rs.sakura.ad.jp/assets/images/home/icon-start.svg
X @sakura_server ul.footer-service-sns > li > a > img.icon-x
rs.sakura.ad.jp/assets/images/common/icons/icon-x.svg
Youtube ul.footer-service-sns > li > a > img.icon-youtube
rs.sakura.ad.jp/assets/images/common/icons/icon-youtube.svg
プライバシーマーク ul.globalfooter-mark-list > li.globalfooter-mark-item > a.globalfooter-mark-link > img.p-mark
PCI DSS監査証明マーク figure.globalfooter-mark > ul.globalfooter-mark-list > li.globalfooter-mark-item > img.pci-dss
ISO27001認証マーク ul.globalfooter-mark-list > li.globalfooter-mark-item > a.globalfooter-mark-link > img.iso-mark

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

●Optimize DOM size
●Font display
●Optimize viewport for mobile
●Minify JavaScript
●Reduce unused CSS
●User Timing marks and measures 20 user timings
●Avoid long main-thread tasks 15 long tasks found
●Avoid non-composited animations 21 animated elements found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 260 ms
●Server Backend Latencies 310 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 270 ms
○INP breakdown
93

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

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
利用できます div.plan-spec > dl > dd > span.c-icon-circle
利用できます div.plan-spec > dl > dd > span.c-icon-circle
利用できます div.plan-spec > dl > dd > span.c-icon-circle
利用できます div.plan-spec > dl > dd > span.c-icon-circle
利用できません div.plan-spec > dl > dd > span.c-icon-dash

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
おすすめ div#splide02-track > div#splide02-list > div#splide02-slide02 > span.label
01 ul.flow-list > li > figure.flow-figure > span
02 ul.flow-list > li > figure.flow-figure > span
03 ul.flow-list > li > figure.flow-figure > span
04 ul.flow-list > li > figure.flow-figure > span
2026/04/08 li.information-item > a.c-button > div.information-meta > time.information-date
お知らせ li.information-item > a.c-button > div.information-meta > span.information-category
2026/04/08 li.information-item > a.c-button > div.information-meta > time.information-date
お知らせ li.information-item > a.c-button > div.information-meta > span.information-category
2026/04/08 li.information-item > a.c-button > div.information-meta > time.information-date
2026/03/31 li.information-item > a.c-button > div.information-meta > time.information-date
お知らせ li.information-item > a.c-button > div.information-meta > span.information-category
2026/03/31 li.information-item > a.c-button > div.information-meta > time.information-date
お知らせ li.information-item > a.c-button > div.information-meta > span.information-category
2026/02/26 li.information-item > a.c-button > div.information-meta > time.information-date
お知らせ li.information-item > a.c-button > div.information-meta > span.information-category

These are opportunities to improve the legibility of your content.

○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.
●ARIA attributes are used as specified for the element's role
●`[aria-hidden="true"]` elements do not contain focusable descendents
●`<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
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●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
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` 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
○`<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
○Form elements have associated labels
○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.
○No element has a `[tabindex]` value greater than 0
○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.
○Identical links have the same purpose.
○Elements with visible text labels have matching accessible names.
○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.
77

Best Practices

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

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
rs.sakura.ad.jp/
Access to fetch at 'https://apm.yahoo.co.jp/rt/?p=POM1Y9HH68&label=&ref=https%3A%2F%2Frs.sakura.ad.jp%2F&rref=&pt=&item=&cat=&price=&quantity=&et_optout=false&r=1776799425.4325411&pvid=zpxxhlg1immo90i2sc&__lt__cid_valid=false&_impl=ytag&brands=%22Chromium%22%3B%20v%3D%22147.0.7727.101%22%2C%20%22Not.A%2FBrand%22%3B%20v%3D%228.0.0.0%22&platform=%22Android%22&platform_version=%2211.0%22' from origin 'https://rs.sakura.ad.jp' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
/rt/?p=POM1Y9HH68&label=&ref=https%3A%2F%2Frs.sakura.ad.j...
Failed to load resource: net::ERR_FAILED
●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
●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 DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○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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