URL substituted: You submitted https://sakura.ne.jp but we scanned https://www.sakura.ne.jp instead — the HTTPS certificate on the submitted hostname didn't cover that name, so we retried on the www. variant
Spain · Madrid Completed: Apr 21, 2026 19:25 UTCMobile 375 × 812
Desktop 1440 × 900
Score: 71 / 100
Based on 8 categories, 0 sections
Room to improve — your 27.3s load time is above Google's 2.5s 'Good' threshold.
Several missing protections leave your users and data exposed.
Several issues make your site difficult for assistive technology users.
Well-optimized for search — your content is discoverable.
Good server performance with room for optimization.
Mostly compliant — a few items need attention.
Good content signals with minor gaps.
Heavier than average — reducing page weight saves energy and bandwidth.
The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.
Weights reflect general web best practices. Individual needs may differ.
Content-Security-Policy header is missing
Security gaps expose your site and users to attacks, eroding trust.
No Content-Security-Policy header found
Security gaps expose your site and users to attacks, eroding trust.
1 link(s) with no accessible text
Accessibility issues exclude users with disabilities — up to 15% of your potential audience.
8 image-only link(s) without alt text
Accessibility issues exclude users with disabilities — up to 15% of your potential audience.
is missing width/height — may cause layout shift
Performance issues directly impact user engagement and conversion rates.
High impact, low effort — start here.
High impact, requires investment.
Small gains, minimal effort.
Nothing in this quadrant — good news.
Low impact, high effort — do last.
Nothing in this quadrant — good news.
[](https://beavercheck.com/results/6062f7b7-06e0-4756-ad41-5e7f56db4a93)<a href="https://beavercheck.com/results/6062f7b7-06e0-4756-ad41-5e7f56db4a93"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fsakura.ne.jp" alt="BeaverCheck Score"></a>https://beavercheck.com/badge?url=https%3A%2F%2Fsakura.ne.jpThis badge auto-updates with your latest scan result.
Your site performs reasonably well, but a few targeted fixes could meaningfully improve results. Your LCP of 27.3s exceeds Google's 2.5s 'Good' threshold and the 1 performance issue below directly contributes to it. Addressing the critical issues below would have the most immediate impact on your user trust.
9 barrier(s) likely increasing bounce by ~33%.
Page takes 27.3s to load
+12% bounceUsers abandon at ~3s — you're 24.8s over the 2.5s threshold
Fix: Optimize render-blocking resources, preload the hero image, and compress images
Page feels frozen for 1.9s
+5% bounceClicks on the primary CTA are ignored while JavaScript runs
Fix: Break up long tasks; defer non-critical JavaScript to post-hydration
No HSTS header
+1% bounceReturning visitors are briefly exposed to downgrade attacks on first request
Fix: Set Strict-Transport-Security: max-age=31536000; includeSubDomains
No Content-Security-Policy header
+1% bounceHigher XSS blast radius — one compromised script can exfiltrate the checkout form
Fix: Ship a reporting-only CSP first, then enforce once violations are clean
Layout shifts during page load
+3% bounceContent movement causes mis-clicks on CTAs and form fields
Fix: Add width/height to images; reserve space for late-loading embeds
No structured data
+2% bounceNo rich-result eligibility in Google — lower SERP CTR vs competitors with stars and prices
Fix: Add JSON-LD for your page type (Product, Article, FAQPage, LocalBusiness, …)
Content is hard to read
+2% bounceGraduate-level reading difficulty — limits the addressable audience for product or blog pages
Fix: Shorten sentences; replace jargon with plain language; target Flesch ease ≥60
No skip-to-content link
+1% bounceKeyboard and screen-reader users must tab through the entire header on every page
Fix: Add a visible-on-focus <a href="#main">Skip to content</a> as the first focusable element
3 broken link(s) on the page
+5% bounceClicks land on 404s — trust drops and the session often ends
Fix: Fix or remove the broken destinations surfaced on the Content tab
Preliminary CRO audit — each barrier links to the tab with detailed analysis.
¥48,000 investment → ¥142/month returns + JPY 100,000,000 risk avoided
¥48,000
6h · 5 findings
¥142 /mo
~¥1,707 / year
JPY 100,000,000
if kept compliant
¥8,000 — in quick wins — start here for the fastest payback
Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.
6.0 developer hours at ¥8000/hr
Based on Japan rates (¥8000/hr)
Start here for the best return on investment
¥8,333,476 / month at risk
~¥100,001,707 / year if left unfixed
¥100,000,000
+2 more
¥142 /mo
11914.3 MB/mo × 11.940 JPY/GB
Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.
Unique monthly visitors from your analytics
Purchases, signups, or key actions
Optional — for revenue estimation
more engaged visitors from reduced bounce
Fix 4 critical issues to capture this value
Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.
Your site's LCP: → estimated after fixes.
These are estimates based on industry research — actual results vary
Your data stays in your browser — nothing is sent to our servers
Thanks for your feedback!
We'll use a cached audit if available, or offer to scan.
Industry-standard audits powered by Google Lighthouse.
Key metrics that affect user experience.
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
4.31 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
27.34 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.94 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.146
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
9.38 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
28.50 s
Audit breakdown by category with detailed findings.
Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.
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
Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.
Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.
Source: Google web.dev / Lighthouse
3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.
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.
Performance issues directly impact user engagement and conversion rates.
Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size
Performance issues directly impact user engagement and conversion rates.
| URL | Resource Size | Est 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.png | 401.1 KiB | 377.0 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.webp | 54.7 KiB | 47.1 KiB |
Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.
Performance issues directly impact user engagement and conversion rates.
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
Performance issues directly impact user engagement and conversion rates.
HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Duration |
|---|---|---|
| rs.sakura.ad.jp/assets/scripts/information.js | 1.8 KiB | 1.2 s |
| rs.sakura.ad.jp/assets/styles/home.css | 4.1 KiB | 1.2 s |
| rs.sakura.ad.jp/assets/styles/style.css | 11.6 KiB | 1.2 s |
| rs.sakura.ad.jp/resource/assets/styles/style.css | 4.0 KiB | 410 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.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Time 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
Performance issues directly impact user engagement and conversion rates.
| Element | Layout 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.
Performance issues directly impact user engagement and conversion rates.
Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| rs.sakura.ad.jp/assets/styles/style.css | 11.6 KiB | 4.0 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.
Multi-megabyte JavaScript bundles delay every interactive feature on the page.
This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.
Source: Google web.dev / Lighthouse
| URL | Transfer Size | Est Savings |
|---|---|---|
| www.googletagmanager.com/gtag/js?id=G-1JCLR3N1HE&cx=c>m=4e64k0h2 | 176.3 KiB | 70.6 KiB |
| www.googletagmanager.com/gtag/js?id=G-RY0M78YRM0&cx=c>m=4e64k0h2 | 172.3 KiB | 68.9 KiB |
| www.googletagmanager.com/gtag/js?id=G-M3MLBH78ML&cx=c>m=4e64k0h2 | 177.9 KiB | 67.3 KiB |
| www.googletagmanager.com/gtag/js?id=G-7VHJVBXPZ3&cx=c>m=4e64k0h2 | 159.5 KiB | 64.6 KiB |
| www.googletagmanager.com/gtag/js?id=AW-17304125414&cx=c>m=4e64k0h2 | 143.4 KiB | 61.8 KiB |
| www.googletagmanager.com/gtag/js?id=AW-985956116&cx=c>m=4e64k0h2 | 145.5 KiB | 61.3 KiB |
| www.googletagmanager.com/gtm.js?id=GTM-NL8DR22 | 187.8 KiB | 52.1 KiB |
| connect.facebook.net/en_US/fbevents.js | 96.5 KiB | 34.2 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.
Performance issues directly impact user engagement and conversion rates.
| URL | Total CPU Time | Script Evaluation | Script Parse |
|---|---|---|---|
| rs.sakura.ad.jp/ | 1.7 s | 12 ms | 1.3 ms |
| Unattributable | 1.1 s | 45 ms | 0.0 ms |
| www.googletagmanager.com/gtm.js?id=GTM-NL8DR22 | 735 ms | 608 ms | 75 ms |
| www.googletagmanager.com/gtag/js?id=G-M3MLBH78ML&cx=c>m=4e64k0h2 | 362 ms | 303 ms | 56 ms |
| www.googletagmanager.com/gtag/js?id=AW-985956116&cx=c>m=4e64k0h2 | 347 ms | 304 ms | 41 ms |
| www.googletagmanager.com/gtag/js?id=AW-17304125414&cx=c>m=4e64k0h2 | 312 ms | 244 ms | 46 ms |
| www.googletagmanager.com/gtag/js?id=G-1JCLR3N1HE&cx=c>m=4e64k0h2 | 279 ms | 224 ms | 51 ms |
| www.googletagmanager.com/gtag/js?id=G-RY0M78YRM0&cx=c>m=4e64k0h2 | 263 ms | 216 ms | 42 ms |
| www.googletagmanager.com/gtag/js?id=G-7VHJVBXPZ3&cx=c>m=4e64k0h2 | 256 ms | 214 ms | 40 ms |
| rs.sakura.ad.jp/assets/scripts/home.js | 203 ms | 63 ms | 0.9 ms |
| connect.facebook.net/en_US/fbevents.js | 168 ms | 96 ms | 36 ms |
| rs.sakura.ad.jp/assets/scripts/script.js | 149 ms | 48 ms | 1.1 ms |
| /signals/config/1254127229730586?v=2.9.303&r=stable&domai... | 139 ms | 116 ms | 22 ms |
| /signals/config/1935121863416672?v=2.9.303&r=stable&domai... | 60 ms | 47 ms | 9.9 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
Performance issues directly impact user engagement and conversion rates.
| Category | Time Spent |
|---|---|
| Script Evaluation | 2.6 s |
| Style & Layout | 1.4 s |
| Other | 1.3 s |
| Script Parsing & Compilation | 461 ms |
| Rendering | 269 ms |
| Garbage Collection | 91 ms |
| Parse HTML & CSS | 69 ms |
Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.
Performance issues directly impact user engagement and conversion rates.
Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
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.
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.
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.
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.
Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.
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.
Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.
Performance issues directly impact user engagement and conversion rates.
| Deprecation / Warning | Source |
|---|---|
| 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
Performance issues directly impact user engagement and conversion rates.
| Source | Description |
|---|---|
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. | |
Failed to load resource: net::ERR_FAILED |
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.
Industry-standard audits powered by Google Lighthouse. — Desktop
Key metrics that affect user experience. — Desktop
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
2.99 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.61 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
144 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.043
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.36 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
8.14 s
Audit breakdown by category with detailed findings.
Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.
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
Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.
Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.
Source: Google web.dev / Lighthouse
3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.
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.
Performance issues directly impact user engagement and conversion rates.
Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.
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.
Performance issues directly impact user engagement and conversion rates.
Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.
Performance issues directly impact user engagement and conversion rates.
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
Performance issues directly impact user engagement and conversion rates.
HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Duration |
|---|---|---|
| rs.sakura.ad.jp/assets/scripts/information.js | 1.8 KiB | 966 ms |
| rs.sakura.ad.jp/assets/styles/home.css | 4.1 KiB | 966 ms |
| rs.sakura.ad.jp/resource/assets/styles/style.css | 4.0 KiB | 342 ms |
| rs.sakura.ad.jp/assets/styles/style.css | 11.6 KiB | 966 ms |
These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.
Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.
Performance issues directly impact user engagement and conversion rates.
| URL | Time Spent |
|---|---|
| www.sakura.ne.jp/ | 964 ms |
| rs.sakura.ad.jp/ | 0.0 ms |
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.
Performance issues directly impact user engagement and conversion rates.
Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.
Multi-megabyte JavaScript bundles delay every interactive feature on the page.
This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.
Source: Google web.dev / Lighthouse
| URL | Transfer Size | Est Savings |
|---|---|---|
| www.googletagmanager.com/gtag/js?id=G-1JCLR3N1HE&cx=c>m=4e64h1 | 176.3 KiB | 70.4 KiB |
| www.googletagmanager.com/gtag/js?id=G-RY0M78YRM0&cx=c>m=4e64h1 | 172.4 KiB | 67.8 KiB |
| www.googletagmanager.com/gtag/js?id=G-M3MLBH78ML&cx=c>m=4e64h1 | 178.0 KiB | 67.1 KiB |
| www.googletagmanager.com/gtag/js?id=G-7VHJVBXPZ3&cx=c>m=4e64h1 | 159.7 KiB | 65.4 KiB |
| www.googletagmanager.com/gtag/js?id=AW-985956116&cx=c>m=4e64h1 | 145.7 KiB | 62.3 KiB |
| www.googletagmanager.com/gtag/js?id=AW-17304125414&cx=c>m=4e64h1 | 143.6 KiB | 61.6 KiB |
| www.googletagmanager.com/gtm.js?id=GTM-NL8DR22 | 188.1 KiB | 52.0 KiB |
| connect.facebook.net/en_US/fbevents.js | 96.5 KiB | 34.5 KiB |
Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| rs.sakura.ad.jp/assets/styles/style.css | 11.6 KiB | 4.0 KiB |
Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.
Performance issues directly impact user engagement and conversion rates.
Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
Performance issues directly impact user engagement and conversion rates.
| URL | |
|---|---|
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-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-pc | /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.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.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-document.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 |
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-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 |
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.
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.
Assistive technologies, like screen readers, can't interpret ARIA attributes with invalid values. Learn more about valid values for ARIA attributes.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
サポート nav#rs-globalnav > ul.rs-globalnav-menu > li > button.rs-globalnav-toggle-button |
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.
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 |
利用できません div.plan-spec > dl > dd > span.c-icon-dash |
利用できません div.plan-spec > dl > dd > span.c-icon-dash |
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 |
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 |
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 |
利用できます div.plan-spec > dl > dd > span.c-icon-circle |
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.
Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
WordPress div#splide02-slide01 > div.plan-spec > dl > dt |
バックアップ＆
ステージング div#splide02-slide01 > div.plan-spec > dl > dt |
複数人での管理 div#splide02-slide01 > div.plan-spec > dl > dt |
おすすめ div#splide02-track > div#splide02-list > div#splide02-slide02 > span.label |
複数人での管理 div#splide02-slide02 > div.plan-spec > dl > dt |
上位プラン変更 div#splide02-slide04 > div.plan-spec > dl > dt |
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 |
オンライン a.c-card-link > div.link-text > div.event-seminar-tags > span.event-seminar-tag |
オンライン a.c-card-link > div.link-text > div.event-seminar-tags > span.event-seminar-tag |
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.
Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.
Performance issues directly impact user engagement and conversion rates.
| Deprecation / Warning | Source |
|---|---|
| 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
Performance issues directly impact user engagement and conversion rates.
| Source | Description |
|---|---|
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=1776799451.698474&pvid=hgng8ckzwtbmo90imjs&__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=%22macOS%22&platform_version=%2210.15.7%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. | |
Failed to load resource: net::ERR_FAILED |
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.
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