D — https://itmedia.co.jp | BeaverCheck Audit

Site Health

Score: 69 / 100

Based on 8 categories, 0 sections

Decent speed, but optimizing further could improve engagement.

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.

Rich content metadata — your pages look great everywhere.

Heavier than average — reducing page weight saves energy and bandwidth.

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

How the composite score is calculated

How you compare

Amazon Route 53 · 975 peers

You 69

Avg 72

At average

0 50 100

Better than 9% of Amazon Route 53 sites See full Amazon Route 53 benchmark →

core-js · 1488 peers

You 69

Avg 72

At average

0 50 100

Better than 9% of core-js sites See full core-js benchmark →

Top Priorities (5)

Content-Security-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

No Content-Security-Policy header found

Security gaps expose your site and users to attacks, eroding trust.

Security › Content Security Policy

No <main> landmark found

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Landmark Structure

Soft 404: server returns HTTP 200 for non-existent pages

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › 404 Error Page

243 third-party resources (100% of weight)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Inventory

View fix priority matrix

Fix Priority Matrix

5 findings

Impact

Quick Wins

High impact, low effort — start here.

Strategic

High impact, requires investment.

Easy Improvements

Small gains, minimal effort.

Nothing in this quadrant — good news.

Deprioritize

Low impact, high effort — do last.

Nothing in this quadrant — good news.

← Low effort High effort →

Embed this badge

Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fitmedia.co.jp)](https://beavercheck.com/results/5ffe4e5a-2f69-4454-9797-dfb243650994)

HTML

<a href="https://beavercheck.com/results/5ffe4e5a-2f69-4454-9797-dfb243650994"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fitmedia.co.jp" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Fitmedia.co.jp

This badge auto-updates with your latest scan result.

What fixing these means

Your site has several issues that may be affecting user experience and business outcomes. Your LCP of 4.6s exceeds Google's 2.5s 'Good' threshold and the 1 performance issue below directly contributes to it. Accessibility issues exclude users who rely on assistive technology — an estimated 15% of your potential audience. Addressing the critical issues below would have the most immediate impact on your user trust.

2 security gaps detected — browsers may warn visitors about your site.

2 accessibility issues exclude users who rely on assistive technology.

Your LCP is 4.6s — fixing the 1 performance critical could bring it under Google's 2.5s 'Good' threshold.

Could reach Estimate based on resolving critical issues

Conversion Barriers

2 critical 4 warning

6 barrier(s) likely increasing bounce by ~26%.

Speed (2)

Page takes 4.6s to load

+12% bounce

Users abandon at ~3s — you're 2.1s over the 2.5s threshold

Fix: Optimize render-blocking resources, preload the hero image, and compress images

Page feels frozen for 3.9s

+5% bounce

Clicks on the primary CTA are ignored while JavaScript runs

Fix: Break up long tasks; defer non-critical JavaScript to post-hydration

Trust (2)

No HSTS header

+1% bounce

Returning 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% bounce

Higher XSS blast radius — one compromised script can exfiltrate the checkout form

Fix: Ship a reporting-only CSP first, then enforce once violations are clean

Content (1)

No structured data

+2% bounce

No 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, …)

Navigation (1)

No skip-to-content link

+1% bounce

Keyboard 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

Preliminary CRO audit — each barrier links to the tab with detailed analysis.

Return on Investment

¥48,000 investment → ¥361,424/month returns + JPY 100,000,000 risk avoided

Payback period: < 1 month First-year ROI: +8936%

Investment

¥48,000

6h · 5 findings

Monthly returns

¥361,424 /mo

~¥4,337,091 / year

Conversions recovered ¥361,323
Bandwidth savings ¥101

Regulatory risk avoided

JPY 100,000,000

if kept compliant

APPI JPY 100,000,000

Payback period

0 12mo 24mo

¥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.

Full methodology & sources

Estimated Remediation Cost

¥48,000

6.0 developer hours at ¥8000/hr

Based on Japan rates (¥8000/hr)

Quick wins

¥8,000 2 fixes in ~60 minutes

Start here for the best return on investment

Cost by category

Cost by effort level

Adjust assumptions

Custom rate

¥ /hr

Rates reflect fully-loaded developer cost including overhead

How developer rates are sourced

What Inaction Is Costing You

¥8,333,435 / month at risk

~¥100,001,217 / year if left unfixed

Compliance Risk

¥100,000,000

APPI

No privacy policy link detected
APPI: JPY 100,000 – JPY 100,000,000
5 advertising/retargeting trackers detected
APPI: JPY 100,000 – JPY 100,000,000
Trackers detected but no cookie policy found
APPI: JPY 100,000 – JPY 100,000,000

+2 more

Bandwidth Waste

¥101 /mo

8496.1 MB/mo × 11.940 JPY/GB

Optimize transfer: save ~850 KB per page load
Saves ¥101/mo

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.

Compliance methodology · SEO assumptions · Bandwidth model

Your performance is already good — improvements may show diminishing returns

Monthly visitors

Unique monthly visitors from your analytics

Conversion rate (%)

Purchases, signups, or key actions

Avg. order value

Optional — for revenue estimation

additional conversions/month

more engaged visitors from reduced bounce

potential monthly revenue

Current bounce (est.)

After fixes (est.)

Estimated bounce reduction

Fix 4 critical issues to capture this value

How this is calculated

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

Bounce-rate model & assumptions

Your data stays in your browser — nothing is sent to our servers

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

Best Practices

SEO

Core Web Vitals

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.

3.92 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.

3.92 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

7.10 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.

24.50 s

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

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

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.

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:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:1.395 source:map[type:text value:[unattributed]]] map[reflowTime:81.022 source:map[column:8 line:610 type:source-location url:https://www.itmedia.co.jp/js/spv/html5base.js?date=202512091010 urlProvider:network]] map[reflowTime:0.43 source:map[column:9 line:670 type:source-location url:https://www.itmedia.co.jp/js/spv/html5base.js?date=202512091010 urlProvider:network]]]

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: icon

path: 2,HTML,1,BODY,11,DIV,6,DIV,0,DIV,7,DIV,2,DIV,0,DIV,5,ARTICLE,0,DIV,1,DIV,1,DIV,0,DIV,0,A,0,IMG

selector: div.colBoxIndex > div.colBoxIcon > a > img

snippet: <img src="https://image.itmedia.co.jp/business/articles/2604/22/top_news022.jpg" width="120" height="90" alt="icon">

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

value: No additional origins are good candidates for preconnecting

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
tr.api.itmedia.co.jp/cc/v1.js	350 B	825 ms
www.itmedia.co.jp/js/spv/html5base.js?date=202512091010	8.6 KiB	150 ms
cx.api.itmedia.co.jp/v1.js	241 B	822 ms
www.itmedia.co.jp/css/spv/html5base_v2.css?date=202601281532	7.9 KiB	150 ms
www.itmedia.co.jp/js/lib/gam_common.js?date=202511251350	3.4 KiB
www.itmedia.co.jp/js/lib/cx_v2.js?date=202507231610	10.2 KiB	150 ms
www.itmedia.co.jp/css/spv/gam.css?date=202604031023	1.5 KiB	150 ms
www.itmedia.co.jp/js/spv/movePC2SP.js?date=202509161040	4.7 KiB
cdn.cxense.com/cx.js	0 B
www.itmedia.co.jp/js/gamServerEnvironment.js?date=202107151140	0 B

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
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.6 KiB
flux-cdn.com/client/00046/itmedia_01591.min.js	300.0 s	81.6 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	73.1 KiB
/signals/config/185005748502834?v=2.9.303&r=stable&domain...	1200.0 s	44.8 KiB
cdn.cxense.com/cx.js	3600.0 s	38.1 KiB
cdn.id5-sync.com/api/1.0/esp.js	3600.0 s	34.7 KiB
pagead2.googlesyndication.com/pagead/js/rum.js?fcd=true	3600.0 s	25.1 KiB
cs.nakanohito.jp/b3/bi.js	10800.0 s	20.7 KiB
j.microad.net/js/compass.js	86400.0 s	31.3 KiB
ep2.adtrafficquality.google/sodar/VFc2VJAc.js	3000.0 s	14.4 KiB
cdn.microad.jp/compass/compass2.js	86400.0 s	24.1 KiB
connectid.analytics.yahoo.com/connectId-gpt.js	3600.0 s	9.0 KiB
static.criteo.net/js/ld/publishertag.ids.js	86400.0 s	14.8 KiB
tags.crwdcntrl.net/lt/c/16589/sync.min.js	86400.0 s	13.1 KiB
rumcdn.geoedge.be/2d032b73-7223-4c17-9dc4-0b563e86d770/grumi-ip.js	14400.0 s	7.1 KiB
invstatic101.creativecdn.com/encrypted-signals/encrypted-tag-g.js	0.0 ms	2.9 KiB
dmp.im-apps.net/sdk/im-uid.js	4747.0 s	3.0 KiB
/pagead/js/r20260420/r20110914/client/qs_click_protection...	1209600.0 s	8.6 KiB
pagead2.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite_fy2021.js	1209600.0 s	8.4 KiB
/ad?spot=02d4d81f406b2b3e25e10fb1a66ced88&cb=microadCompa...	0.0 ms	416 B
/ad?spot=026e18e7d359d1b010dc11395bf6efa3&cb=microadCompa...	0.0 ms	415 B
/Repo/rep.gif?ver=3.3.0&typ=pgv&rnd=mo9cnd0u6gixd5db&sid=...	0.0 ms	410 B
tr.api.itmedia.co.jp/cc/v1.js	0.0 ms	350 B
/pagead/js/r20260420/r20110914/elements/html/omrhp_fy2021.js	1209600.0 s	3.3 KiB
cx.api.itmedia.co.jp/v1.js	0.0 ms	241 B
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js	1209600.0 s	1.5 KiB
/aon.png?customerId=b18a644a0e17bc7f&uid=&cxckp=cx%3Arzli...	3600.0 s	146 B
cdn.jsdelivr.net/gh/prebid/shared-id/pubcid.js/docs/pubcid.min.js	604800.0 s	617 B
/tr/?id=185005748502834&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	19 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
j.microad.net/js/compass.js	86400.0 s	0 B
cdn.cxense.com/cx.js	3600.0 s	0 B
cdn.microad.jp/compass/compass2.js	86400.0 s	0 B
dmp.im-apps.net/sdk/im-uid.js	4747.0 s	0 B

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
from エンタープライズ＆エグゼクティブ＆ TechTarget ＆マーケティング＆キーマンズネット `div#colBoxIndexTheme4 > div.colBoxOuter > div.colBoxInner > div.colBoxHead2`	s0.2mdn.net/simgad/9085392786287634694	66.1 KiB	55.9 KiB
icon `div.colBoxIndex > div.colBoxIcon > a > img`	image.itmedia.co.jp/business/articles/2604/22/top_news022.jpg	6.4 KiB	4.6 KiB
icon `div.colBoxIndex > div.colBoxIcon > a > img`	image.itmedia.co.jp/news/articles/2604/05/top_news003.jpg	6.2 KiB	4.5 KiB

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

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 3.6 s

URL	Time Spent
itmedia.co.jp/	954 ms
www.itmedia.co.jp/	2.7 s
www.itmedia.co.jp/spv/	0.0 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 5.1 KiB

URL	Transfer Size	Est Savings
www.itmedia.co.jp/js/spv/html5base.js?date=202512091010	8.3 KiB	2.6 KiB
www.itmedia.co.jp/js/lib/cx_v2.js?date=202507231610	10.0 KiB	2.5 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

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more ▾

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

Estimated savings: 20 ms 713.4 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=AW-10976778865&cx=c&gtm=4e64k0h2	143.4 KiB	105.8 KiB
www.googletagmanager.com/gtag/js?id=AW-1032582312&cx=c&gtm=4e64k0h2	146.4 KiB	104.8 KiB
www.googletagmanager.com/gtag/js?id=AW-578569290&cx=c&gtm=4e64k0h2	136.4 KiB	102.5 KiB
/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31...	187.4 KiB	89.6 KiB
www.googletagmanager.com/gtag/js?id=G-419SLCGX56&cx=c&gtm=4e64k0h2	152.0 KiB	63.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-W3CLTQN	187.8 KiB	52.3 KiB
fundingchoicesmessages.google.com/i/43042345?ers=3	68.5 KiB	36.4 KiB
connect.facebook.net/en_US/fbevents.js	96.5 KiB	33.6 KiB
cdn.cxense.com/cx.js	37.5 KiB	31.5 KiB
cdn.cxense.com/cx.js	37.5 KiB	31.5 KiB
cdn.cxense.com/cx.js	37.5 KiB	31.5 KiB
cdn.id5-sync.com/api/1.0/esp.js	34.4 KiB	30.7 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
fundingchoicesmessages.google.com/i/43042345?ers=3	1.6 s	1.4 s	28 ms
Unattributable	1.4 s	252 ms	0.0 ms
/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31...	1.1 s	891 ms	79 ms
www.googletagmanager.com/gtm.js?id=GTM-W3CLTQN	1.0 s	864 ms	153 ms
www.itmedia.co.jp/spv/	522 ms	305 ms	20 ms
cdn.cxense.com/cx.js	466 ms	287 ms	99 ms
www.googletagmanager.com/gtag/js?id=G-419SLCGX56&cx=c&gtm=4e64k0h2	352 ms	288 ms	60 ms
www.googletagmanager.com/gtag/js?id=AW-1032582312	350 ms	286 ms	61 ms
www.itmedia.co.jp/js/spv/html5base.js?date=202512091010	340 ms	1.3 ms	7.6 ms
www.googletagmanager.com/gtag/js?id=AW-10976778865	339 ms	247 ms	56 ms
www.googletagmanager.com/gtag/js?id=AW-578569290	278 ms	221 ms	55 ms
flux-cdn.com/client/00046/itmedia_01591.min.js	266 ms	158 ms	85 ms
connect.facebook.net/en_US/fbevents.js	185 ms	137 ms	48 ms
/signals/config/185005748502834?v=2.9.303&r=stable&domain...	166 ms	140 ms	25 ms
securepubads.g.doubleclick.net/tag/js/gpt.js	129 ms	100 ms	28 ms
rumcdn.geoedge.be/2d032b73-7223-4c17-9dc4-0b563e86d770/grumi.js	120 ms	76 ms	44 ms
/f/AGSKWxVFHCXB4vV5_MaOmfHcWUB-Bg2ssozcBFHcBuWDv_Q8paEUIC...	91 ms	86 ms	1.0 ms
tags.crwdcntrl.net/lt/c/16589/sync.min.js	87 ms	64 ms	12 ms
www.googletagmanager.com/gtag/js?id=AW-1032582312&cx=c&gtm=4e64k0h2	87 ms	30 ms	56 ms
www.googletagmanager.com/gtag/js?id=AW-578569290&cx=c&gtm=4e64k0h2	84 ms	28 ms	55 ms
www.googletagmanager.com/gtag/js?id=AW-10976778865&cx=c&gtm=4e64k0h2	84 ms	29 ms	54 ms
oa.openxcdn.net/esp.js	79 ms	67 ms	11 ms
www.itmedia.co.jp/js/lib/cx_v2.js?date=202507231610	68 ms	25 ms	10 ms
ep2.adtrafficquality.google/sodar/sodar2.js	68 ms	57 ms	7.1 ms
static.criteo.net/js/ld/publishertag.ids.js	63 ms	51 ms	11 ms
cdn.treasuredata.com/sdk/2.5/td.min.js	61 ms	43 ms	17 ms
cdn.id5-sync.com/api/1.0/esp.js	61 ms	40 ms	16 ms
/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads...	57 ms	6.9 ms	0.0 ms
rumcdn.geoedge.be/2d032b73-7223-4c17-9dc4-0b563e86d770/grumi-ip.js	57 ms	48 ms	5.4 ms
pagead2.googlesyndication.com/pagead/js/rum.js?fcd=true	55 ms	30 ms	23 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	6.6 s
Other	1.5 s
Script Parsing & Compilation	1.2 s
Style & Layout	417 ms
Garbage Collection	183 ms
Parse HTML & CSS	67 ms
Rendering	58 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.

URL	Transfer Size
www.googletagmanager.com/gtm.js?id=GTM-W3CLTQN	187.9 KiB
/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31...	187.4 KiB
www.googletagmanager.com/gtag/js?id=G-419SLCGX56&cx=c&gtm=4e64k0h2	152.0 KiB
www.googletagmanager.com/gtag/js?id=AW-1032582312	146.7 KiB
www.googletagmanager.com/gtag/js?id=AW-1032582312&cx=c&gtm=4e64k0h2	146.5 KiB
www.googletagmanager.com/gtag/js?id=AW-10976778865	143.6 KiB
www.googletagmanager.com/gtag/js?id=AW-10976778865&cx=c&gtm=4e64k0h2	143.5 KiB
www.googletagmanager.com/gtag/js?id=AW-578569290	136.9 KiB
www.googletagmanager.com/gtag/js?id=AW-578569290&cx=c&gtm=4e64k0h2	136.4 KiB
rumcdn.geoedge.be/2d032b73-7223-4c17-9dc4-0b563e86d770/grumi.js	103.3 KiB

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

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Font display

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Reduce unused CSS

●User Timing marks and measures 26 user timings

●Avoid long main-thread tasks 20 long tasks found

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

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 210 ms

●Server Backend Latencies 1,320 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 70 ms

○INP breakdown

○Avoid non-composited animations

○Avoid large layout shifts

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.

Best practices

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html `html`

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>`

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●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

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<frame>` or `<iframe>` elements have a title

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

●No element has a `[tabindex]` value greater than 0

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○Deprecated ARIA roles were not used

○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

○`[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

○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

○Buttons have an accessible name

○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

○`<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

○Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

○List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

○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.

○Uses ARIA roles only on compatible elements

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

○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.

Best Practices

User Experience

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Displayed size	Actual size	Expected size
icon `div.colBoxIndex > div.colBoxIcon > a > img`	image.itmedia.co.jp/business/articles/2604/22/top_news012.jpg	120 x 90	120 x 90	180 x 135
icon `div.colBoxIndex > div.colBoxIcon > a > img`	image.itmedia.co.jp/business/articles/2604/22/top_news022.jpg	120 x 90	120 x 90	180 x 135
icon `div.colBoxIndex > div.colBoxIcon > a > img`	image.itmedia.co.jp/business/articles/2604/22/top_news023.jpg	120 x 90	120 x 90	180 x 135
icon `div.colBoxIndex > div.colBoxIcon > a > img`	image.itmedia.co.jp/news/articles/2604/05/top_news003.jpg	120 x 90	120 x 90	180 x 135
icon `div.colBoxIndex > div.colBoxIcon > a > img`	image.itmedia.co.jp/news/articles/2604/22/top_news026.jpg	120 x 90	120 x 90	180 x 135

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
Topics	invstatic101.creativecdn.com/encrypted-signals/encrypted-tag-g.js line 5, col 1847

●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

●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

Performance issues directly impact user engagement and conversion rates.

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`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

Best Practices

100

SEO

Core Web Vitals

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.

1.31 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

1.42 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

872 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.007

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

4.46 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.

8.03 s

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.

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

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.

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
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.6 KiB
flux-cdn.com/client/00046/itmedia_01591.min.js	300.0 s	81.6 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	73.1 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	73.1 KiB
/signals/config/185005748502834?v=2.9.303&r=stable&domain...	1200.0 s	44.8 KiB
cdn.cxense.com/cx.js	3600.0 s	38.1 KiB
cdn.cxense.com/cx.js	3600.0 s	38.1 KiB
cdn.id5-sync.com/api/1.0/esp.js	3600.0 s	34.7 KiB
pagead2.googlesyndication.com/pagead/js/rum.js?fcd=true	3600.0 s	25.1 KiB
cs.nakanohito.jp/b3/bi.js	10800.0 s	20.7 KiB
ep2.adtrafficquality.google/sodar/VFc2VJAc.js	3000.0 s	14.4 KiB
connectid.analytics.yahoo.com/connectId-gpt.js	3600.0 s	9.0 KiB
static.criteo.net/js/ld/publishertag.ids.js	86400.0 s	14.8 KiB
tags.crwdcntrl.net/lt/c/16589/sync.min.js	86400.0 s	13.1 KiB
rumcdn.geoedge.be/2d032b73-7223-4c17-9dc4-0b563e86d770/grumi-ip.js	14400.0 s	7.1 KiB
cse.google.com/cse.js?cx=000492183644671384608:6dff3odaltq	0.0 ms	4.0 KiB
invstatic101.creativecdn.com/encrypted-signals/encrypted-tag-g.js	0.0 ms	2.9 KiB
/v1/000GPFga3O1vbNuzhU49ZtSbm2Nw63YhthzzYz6tSDK5C12A5XHD8...	86400.0 s	6.3 KiB
/v1/001oaYGiQdLTaRVFjbIRCn1JsqVkwpvEynZyJIMyNU3yPFOek307F...	86400.0 s	5.7 KiB
/v1/000L9OoXkxSazCUmKf4OLPmIYqZhD0Qk5ojOKepjUNEmaVbbhEgqL...	86400.0 s	5.6 KiB
/v1/000L9OoXkxSazCUmKf4OLPmIYqZhD0Qk5oj5ZY5IMSVgmK2Ta8aj1...	86400.0 s	4.8 KiB
/v1/000jJf2zR0jt9gJ3qcTPTjuD2mXxbZnGq34dCGcvYL8UrW3LxbNGn...	86400.0 s	4.1 KiB
pagead2.googlesyndication.com/pagead/js/r20260421/r20110914/abg_lite.js	1209600.0 s	10.5 KiB
www.google.com/cse/static/style/look/v6/default.css	3000.0 s	1.2 KiB
/pagead/js/r20260420/r20110914/client/qs_click_protection...	1209600.0 s	8.5 KiB
/v1/002enbgBanXw2q8vNuPEvMN7fIQ8SL03ow3wfWFFwteCxaNV2r047...	86400.0 s	1.9 KiB
/pagead/js/r20260421/r20110914/elements/html/omrhp.js	1209600.0 s	4.7 KiB
/Repo/rep.gif?ver=3.3.0&typ=pgv&rnd=mo9cnxz171nw8tpo&sid=...	0.0 ms	412 B
tr.api.itmedia.co.jp/cc/v1.js	0.0 ms	350 B
cx.api.itmedia.co.jp/v1.js	0.0 ms	241 B
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js	1209600.0 s	1.6 KiB
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js	1209600.0 s	1.2 KiB
/aon.png?customerId=b18a644a0e17bc7f&uid=&cxckp=cx%3A2t19...	3600.0 s	146 B
cdn.jsdelivr.net/gh/prebid/shared-id/pubcid.js/docs/pubcid.min.js	604800.0 s	973 B
/tr/?id=185005748502834&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	16 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/js/r20260420/r20110914/client/qs_click_protection...	1209600.0 s	0 B
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js	1209600.0 s	0 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.

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:0.2 source:map[column:1707 line:6 type:source-location url:/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads-contributor.ContributorServingResponseClientJs.en_US.DsKGN-qqfrQ.es5.O/d=1/exm=kernel_loader,loader_js_executable,web_iab_tcf_v2_signal_executable/ed=1/rs=AJlcJMz2YRLcgcQw7bN4By8dD3CBlNJULw/m=ad_blocking_detection_executable 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:13.731 source:map[column:237248 line:18 type:source-location url:https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31097945 urlProvider:network]] map[reflowTime:2.282 source:map[column:102033 line:18 type:source-location url:https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31097945 urlProvider:network]] map[reflowTime:52.378 source:map[column:241855 line:18 type:source-location url:https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31097945 urlProvider:network]] map[reflowTime:1.429 source:map[type:text value:[unattributed]]] map[reflowTime:0.243 source:map[column:143046 line:18 type:source-location url:https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31097945 urlProvider:network]] map[reflowTime:0.144 source:map[column:71625 line:5 type:source-location url:https://cdn.cxense.com/cx.js urlProvider:network]] map[reflowTime:0.316 source:map[column:1628 line:5 type:source-location url:/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads-contributor.ContributorServingResponseClientJs.en_US.DsKGN-qqfrQ.es5.O/d=1/exm=kernel_loader,loader_js_executable,web_iab_tcf_v2_signal_executable/ed=1/rs=AJlcJMz2YRLcgcQw7bN4By8dD3CBlNJULw/m=ad_blocking_detection_executable urlProvider:network]]]

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.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
tr.api.itmedia.co.jp/cc/v1.js	350 B	292 ms
www.itmedia.co.jp/js/base_v2.js?202501291050	9.2 KiB	107 ms
fc.itmedia.co.jp/fpcookie?site_id=itm_	1001 B	275 ms
cx.api.itmedia.co.jp/v1.js	241 B	274 ms
www.itmedia.co.jp/js/gamServerEnvironment.js?date=202107151140	356 B
www.itmedia.co.jp/js/lib/cx_v2.js?202507231610	10.2 KiB
www.itmedia.co.jp/css/top/base.css?202511251430	2.3 KiB
www.itmedia.co.jp/js/spv/movePC2SP.js?date=250916104008	4.7 KiB
www.itmedia.co.jp/css/gnavi.css?date=202601281531	4.0 KiB
www.itmedia.co.jp/css/base.css?202509161104	5.0 KiB
cdn.cxense.com/cx.js	38.1 KiB	167 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
static.criteo.net/design/dt/59b95d61b36143bab1e1f6adc740526b_adihausbold.woff	10 ms
static.criteo.net/design/dt/df5b439f06e34b19bdeac1f8701aba0d_adihausregular.woff	10 ms

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
body > div#google_image_div > a#aw0 > img.img_ad `body > div#google_image_div > a#aw0 > img.img_ad`	tpc.googlesyndication.com/simgad/14211902422675294702	137.2 KiB	97.7 KiB
・OpenAI、“視覚的思考パートナー”「ChatGPT Images 2.0」発表　Web検索結果を反映する画像生成も可能に `div.colBoxIndex > div.colBoxUlist > ul > li`	tpc.googlesyndication.com/simgad/8942407595710879420?	49.2 KiB	48.4 KiB
icon `div.colBoxIndex > div.colBoxIcon > a > img`	tpc.googlesyndication.com/simgad/12555551469554340024?	38.8 KiB	38.0 KiB
・“Mythos級”AI到来に備え、自民党が日本版「Project Glasswing」組成を検討 `div.colBoxIndex > div.colBoxUlist > ul > li`	tpc.googlesyndication.com/simgad/4846201149167440866?	22.2 KiB	21.4 KiB
メディア一覧 \| 公式SNS \| 広告案内 \| お問い合わせ \| プライバシーポリシー \| RSS \| 運営会社 \| 採用情報 \| 推奨環境 `div#globalFooter > div#globalFooterCorp > div#globalFooterCorpIn > p#globalFooterCorpLink`	/simgad/7370903963884609559?sqp=uqWu0g0ICPoBEKwCQGQ&rs=AO...	27.1 KiB	14.9 KiB
アイティメディアのタイアップコンテンツページへのリンク `div.colBoxIndex > div.colBoxBanner > a > img`	image.itmedia.co.jp/images0509/tot_banner_1_1703141393.jpg	7.0 KiB	5.1 KiB
icon `div.colBoxIndex > div.colBoxIcon > a > img`	image.itmedia.co.jp/business/articles/2604/22/top_news022.jpg	6.4 KiB	4.6 KiB
icon `div.colBoxIndex > div.colBoxIcon > a > img`	image.itmedia.co.jp/news/articles/2604/05/top_news003.jpg	6.2 KiB	4.5 KiB

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 403 ms

URL	Time Spent
itmedia.co.jp/	403 ms
www.itmedia.co.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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

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
/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31...	1.8 s	1.6 s	19 ms
Unattributable	844 ms	293 ms	0.0 ms
fundingchoicesmessages.google.com/i/43042345?ers=3	732 ms	713 ms	7.1 ms
cdn.cxense.com/cx.js	544 ms	90 ms	9.4 ms
www.itmedia.co.jp/	378 ms	16 ms	5.1 ms
www.googletagmanager.com/gtm.js?id=GTM-W3CLTQN	236 ms	201 ms	26 ms
/pagead/managed/js/activeview/current/ufs_web_display.js	116 ms	103 ms	8.1 ms
www.googletagmanager.com/gtag/js?id=AW-1032582312	103 ms	87 ms	15 ms
www.googletagmanager.com/gtag/js?id=AW-10976778865	89 ms	74 ms	14 ms
www.googletagmanager.com/gtag/js?id=AW-578569290	88 ms	63 ms	14 ms
flux-cdn.com/client/00046/itmedia_01591.min.js	86 ms	53 ms	26 ms
www.googletagmanager.com/gtag/js?id=G-419SLCGX56&cx=c&gtm=4e64h1	84 ms	68 ms	15 ms
rumcdn.geoedge.be/2d032b73-7223-4c17-9dc4-0b563e86d770/grumi-ip.js	58 ms	36 ms	5.8 ms
/signals/config/185005748502834?v=2.9.303&r=stable&domain...	58 ms	39 ms	6.5 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	3.8 s
Other	1.1 s
Style & Layout	355 ms
Script Parsing & Compilation	321 ms
Garbage Collection	103 ms
Rendering	64 ms
Parse HTML & CSS	44 ms

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: 0.0 ms 2.8 KiB

URL	Transfer Size	Est Savings
www.google.com/cse/static/element/b33cba5881f68fbf/default_v6+ja.css	9.7 KiB	2.8 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 2.5 KiB

URL	Transfer Size	Est Savings
www.itmedia.co.jp/js/lib/cx_v2.js?202507231610	10.0 KiB	2.5 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

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more ▾

Source: Google web.dev / Lighthouse

Estimated savings: 0.0 ms 1.1 MiB

URL	Transfer Size	Est Savings
/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31...	599.8 KiB	281.0 KiB
www.googletagmanager.com/gtag/js?id=AW-10976778865&cx=c&gtm=4e64h1	143.5 KiB	106.0 KiB
www.googletagmanager.com/gtag/js?id=AW-1032582312&cx=c&gtm=4e64h1	146.5 KiB	105.1 KiB
www.googletagmanager.com/gtag/js?id=AW-578569290&cx=c&gtm=4e64h1	136.5 KiB	102.7 KiB
www.googletagmanager.com/gtag/js?id=G-419SLCGX56&cx=c&gtm=4e64h1	152.1 KiB	63.3 KiB
flux-cdn.com/client/00046/itmedia_01591.min.js	81.5 KiB	58.1 KiB
www.googletagmanager.com/gtag/js?id=AW-578569290	136.5 KiB	55.8 KiB
www.googletagmanager.com/gtag/js?id=AW-10976778865	143.6 KiB	55.6 KiB
www.googletagmanager.com/gtag/js?id=AW-1032582312	146.6 KiB	54.1 KiB
www.googletagmanager.com/gtm.js?id=GTM-W3CLTQN	188.1 KiB	53.2 KiB
/cse/static/element/b33cba5881f68fbf/cse_element__ja.js?u...	98.8 KiB	49.5 KiB
fundingchoicesmessages.google.com/i/43042345?ers=3	68.5 KiB	36.3 KiB
connect.facebook.net/en_US/fbevents.js	96.5 KiB	34.2 KiB
cse.google.com/adsense/search/async-ads.js	43.3 KiB	33.4 KiB
cdn.id5-sync.com/api/1.0/esp.js	34.4 KiB	30.7 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	73.1 KiB	30.3 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31...	599.9 KiB
www.googletagmanager.com/gtm.js?id=GTM-W3CLTQN	188.3 KiB
www.googletagmanager.com/gtag/js?id=G-419SLCGX56&cx=c&gtm=4e64h1	152.2 KiB
www.googletagmanager.com/gtag/js?id=AW-1032582312	146.9 KiB
www.googletagmanager.com/gtag/js?id=AW-1032582312&cx=c&gtm=4e64h1	146.6 KiB
www.googletagmanager.com/gtag/js?id=AW-10976778865	143.6 KiB
www.googletagmanager.com/gtag/js?id=AW-10976778865&cx=c&gtm=4e64h1	143.5 KiB
tpc.googlesyndication.com/simgad/14211902422675294702	137.6 KiB
www.googletagmanager.com/gtag/js?id=AW-578569290	136.6 KiB
www.googletagmanager.com/gtag/js?id=AW-578569290&cx=c&gtm=4e64h1	136.5 KiB

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

●Layout shift culprits

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Reduce unused CSS

●User Timing marks and measures 26 user timings

●Avoid long main-thread tasks 17 long tasks found

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

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 290 ms

●Server Backend Latencies 410 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 140 ms

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

○LCP request discovery

○Avoid non-composited animations

Accessibility

Contrast

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
AI＋ `div.colBoxIndex > div.colBoxTitle > span.colBoxInfo > a`

These are opportunities to improve the legibility of your content.

Best practices

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html#masterChannel-top `html#masterChannel-top`

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

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Image elements have `[alt]` attributes

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<frame>` or `<iframe>` elements have a title

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links 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

●No element has a `[tabindex]` value greater than 0

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[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

○Buttons have an accessible name

○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

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○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.

○Uses ARIA roles only on compatible elements

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

○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.

Best Practices

Browser Compatibility

Specifying a doctype prevents the browser from switching to quirks-mode. Learn more about the doctype declaration.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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
SharedStorage	/pagead/managed/js/activeview/current/ufs_web_display.js line 252, col 234
Topics	invstatic101.creativecdn.com/encrypted-signals/encrypted-tag-g.js line 5, col 1847

●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

●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

100

SEO

○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`

Results for https://itmedia.co.jp

Site Health

How you compare

Top Priorities (5)

Fix Priority Matrix

Quick Wins

Strategic

Easy Improvements

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What fixing these means

Conversion Barriers

Speed (2)

Trust (2)

Content (1)

Navigation (1)

Return on Investment

Investment

Monthly returns

Regulatory risk avoided

Payback period

Estimated Remediation Cost

Cost by category

Cost by effort level

What Inaction Is Costing You

Compliance Risk

Bandwidth Waste

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Best practices

Best Practices

User Experience

General

SEO

Content Best Practices

Lighthouse Scores

Core Web Vitals

Detailed Report

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Insights

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Contrast

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Best Practices

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General

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