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https://d.hatena.ne.jp

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
2
REVIEW
5
PASS
8
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
50
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.75 s

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

6.19 s

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

877 ms

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

0.152

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

2.73 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.

6.53 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
8 PASS 5 REVIEW 2 FIX
D
Third-Party Impact
Action
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (731.5 KiB of 739.6 KiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
D
JS Execution Cost
Action
2334ms total JS execution
FIX
2334ms total JS execution
Warning::
https://d.hatena.ne.jp/: 747ms CPU time
Warning::
https://live.blog-tags.st-hatena.com/_next/static/...: 486ms CPU time
Warning::
Unattributable: 474ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DWG0...: 284ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-461...: 262ms CPU time
Warning::
Third-party scripts: 1587ms (68% of total)

Main Thread Breakdown

Script Evaluation 42% Style & Layout 26% Other 18% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://d.hatena.ne.jp/747ms7ms2ms1st
https://live.blog-tags.st-hatena.com/_next/static/chunks/commons.d78459f0c3cff869b62b.js486ms402ms79ms3rd
Unattributable474ms113ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DWG0LC0DR1&cx=c&gtm=4e64k0284ms209ms65ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-46136157-1262ms203ms56ms3rd
https://www.google-analytics.com/analytics.js81ms63ms17ms3rd
C
Image Optimization
Action
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Warning::
https://live.blog-tags.st-hatena.com//_next/static... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://live.blog-tags.st-hatena.com//_next/static... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://live.blog-tags.st-hatena.com//_next/static... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://live.blog-tags.st-hatena.com//_next/static... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://live.blog-tags.st-hatena.com//_next/static... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10 images 229 KB
0 oversized -0 KB
10 legacy format
5 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Bundles
Action
8 scripts, 240 KB unused
REVIEW
8 scripts, 240 KB unused
Warning::
https://live.blog-tags.st-hatena.com/_next/static/...: 92 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DWG0...: 64 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-461...: 64 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://live.blog-tags.st-hatena.com/_next/static/...: 20 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 240 KB
240 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://live.blog-tags.st-hatena.com/_next/static/chunks/commons.d78459f0c3cff869b62b.js164 KB92 KB (56%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-DWG0LC0DR1&cx=c&gtm=4e64k0146 KB64 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-46136157-1125 KB64 KB (51%)✓3rd
https://live.blog-tags.st-hatena.com/_next/static/ecCy-ZoXLhV5wFwpEDUKj/pages/_app.js26 KB20 KB (80%)✓3rd
https://live.blog-tags.st-hatena.com/_next/static/ecCy-ZoXLhV5wFwpEDUKj/pages/index.js8 KB—✓3rd
https://live.blog-tags.st-hatena.com/_next/static/runtime/webpack-035ac2b14bde147cb4a8.js1 KB—✓3rd
https://live.blog-tags.st-hatena.com/_next/static/runtime/main-389f2d5a5a59288bda75.js5 KB—✓3rd
https://www.google-analytics.com/analytics.js21 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

B
Page Weight Inventory
22 resources · 740 KB · 240 KB savings available
REVIEW
22 resources · 740 KB · 240 KB savings available
Info::
Within 1MB page-weight target
Got: 740 KB
Info::
~240 KB of savings available
Warning::
21 third-party resources (99% of weight)
22 resources · 739.6 KiB · 21 third-party Within 1MB page-weight target
JavaScript 67% · 494.8 KiB
Image 32% · 236.1 KiB
Document 1% · 8.1 KiB
Other 0% · 548 B

~240.0 KiB of savings available

Remove unused JavaScript: 240.0 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
ETag present — enables conditional (304) responses
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
A
Page Weight Budget
740 KB transferred, 22 requests
PASS
740 KB transferred, 22 requests
Info::
Page weighs 1.8 MB (740 KB transferred)
Info::
22 HTTP requests
Info::
Estimated 0.15 g CO2 per page load
740 KB / 2.4 MB budget
740 KB transferred
22 requests
0.15 g CO2 per page load
JavaScript 494.8 KiB 67%
Images 229.3 KiB 31%
HTML 8.1 KiB 1%
Other 6.7 KiB 1%
Other 548 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
—
preload
5
dns-prefetch
—
prefetch
—

5 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
22 requests over 3456ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 1.8 s LCP 6.2 shttps://d.hatena.ne.jp// https://d.hatena.ne.jp/ — 200 — 8.1 KiB — 915 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=UA-46136157-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-46136157-1 — 200 — 125.2 KiB — 49 ms — h2https://live.blog-tags.st-hatena.com/_next/static/ecCy-ZoXLhV5wFwpEDUKj/pages/index.jslive.blog-tags.st-hatena.com/_next/... https://live.blog-tags.st-hatena.com/_next/static/ecCy-ZoXLhV5wFwpEDUKj/pages/index.js — 200 — 8.0 KiB — 1.4 s — h2https://live.blog-tags.st-hatena.com/_next/static/ecCy-ZoXLhV5wFwpEDUKj/pages/_app.jslive.blog-tags.st-hatena.com/_next/... https://live.blog-tags.st-hatena.com/_next/static/ecCy-ZoXLhV5wFwpEDUKj/pages/_app.js — 200 — 25.6 KiB — 1.4 s — h2https://live.blog-tags.st-hatena.com/_next/static/runtime/webpack-035ac2b14bde147cb4a8.jslive.blog-tags.st-hatena.com/_next/... https://live.blog-tags.st-hatena.com/_next/static/runtime/webpack-035ac2b14bde147cb4a8.js — 200 — 914 B — 935 ms — h2https://live.blog-tags.st-hatena.com/_next/static/chunks/commons.d78459f0c3cff869b62b.jslive.blog-tags.st-hatena.com/_next/... https://live.blog-tags.st-hatena.com/_next/static/chunks/commons.d78459f0c3cff869b62b.js — 200 — 163.9 KiB — 1.8 s — h2https://live.blog-tags.st-hatena.com/_next/static/runtime/main-389f2d5a5a59288bda75.jslive.blog-tags.st-hatena.com/_next/... https://live.blog-tags.st-hatena.com/_next/static/runtime/main-389f2d5a5a59288bda75.js — 200 — 4.6 KiB — 1.6 s — h2https://live.blog-tags.st-hatena.com//_next/static/images/serviceLogo-69b3b2c074e155b6211649fba846eb8d.svglive.blog-tags.st-hatena.com//_next... https://live.blog-tags.st-hatena.com//_next/static/images/serviceLogo-69b3b2c074e155b6211649fba846eb8d.svg — 200 — 1.6 KiB — 1.6 s — h2https://live.blog-tags.st-hatena.com//_next/static/images/book-2a2b46c9841dbc9af521bb64d4f8b804.svglive.blog-tags.st-hatena.com//_next... https://live.blog-tags.st-hatena.com//_next/static/images/book-2a2b46c9841dbc9af521bb64d4f8b804.svg — 200 — 437 B — 780 ms — h2https://live.blog-tags.st-hatena.com//_next/static/images/feature_meaning-fdcdc80e96fb5b10479cacf76192e229.pnglive.blog-tags.st-hatena.com//_next... https://live.blog-tags.st-hatena.com//_next/static/images/feature_meaning-fdcdc80e96fb5b10479cacf76192e229.png — 200 — 28.2 KiB — 1.2 s — h2https://live.blog-tags.st-hatena.com//_next/static/images/hero_illust-932d6c18159d86d4210bba595c75abc8.svglive.blog-tags.st-hatena.com//_next... https://live.blog-tags.st-hatena.com//_next/static/images/hero_illust-932d6c18159d86d4210bba595c75abc8.svg — 200 — 4.7 KiB — 996 ms — h2https://www.googletagmanager.com/gtag/js?id=G-DWG0LC0DR1&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-DWG0LC0DR1&cx=c&gtm=4e64k0 — 200 — 145.7 KiB — 31 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 16 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-DWG0LC0DR1&gtm=45je64k0v9122491469za20g&_p=1776895513954&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=EAAI&are=1&cid=289744628.1776895514&frm=0&ir=1&pscdl=noapi&rcb=7&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938469~117266401~117512543~118128923&sid=1776895514&sct=1&seg=0&dl=https%3A%2F%2Fd.hatena.ne.jp%2F&dt=%E3%81%AF%E3%81%A6%E3%81%AA%E3%83%96%E3%83%AD%E3%82%B0%20%E3%82%BF%E3%82%B0%E3%81%A8%E3%81%AF%20-%20%E3%81%AF%E3%81%A6%E3%81%AA%E3%83%96%E3%83%AD%E3%82%B0&en=page_view&_fv=1&_ss=1&tfd=1302region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-DWG0LC0DR1&gtm=45je64k0v9122491469za20g&_p=1776895513954&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=EAAI&are=1&cid=289744628.1776895514&frm=0&ir=1&pscdl=noapi&rcb=7&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938469~117266401~117512543~118128923&sid=1776895514&sct=1&seg=0&dl=https%3A%2F%2Fd.hatena.ne.jp%2F&dt=%E3%81%AF%E3%81%A6%E3%81%AA%E3%83%96%E3%83%AD%E3%82%B0%20%E3%82%BF%E3%82%B0%E3%81%A8%E3%81%AF%20-%20%E3%81%AF%E3%81%A6%E3%81%AA%E3%83%96%E3%83%AD%E3%82%B0&en=page_view&_fv=1&_ss=1&tfd=1302 — 204 — 548 B — 24 ms — h2https://live.blog-tags.st-hatena.com//_next/static/images/feature_learn-thoughts-b4ef37cdc6dcf4edcac25461d6e62b54.pnglive.blog-tags.st-hatena.com//_next... https://live.blog-tags.st-hatena.com//_next/static/images/feature_learn-thoughts-b4ef37cdc6dcf4edcac25461d6e62b54.png — 200 — 106.2 KiB — 1.1 s — h2https://live.blog-tags.st-hatena.com//_next/static/images/speechBubbles-825424f22f6bd0bedfc11e9b1e3dd2ab.svglive.blog-tags.st-hatena.com//_next... https://live.blog-tags.st-hatena.com//_next/static/images/speechBubbles-825424f22f6bd0bedfc11e9b1e3dd2ab.svg — 200 — 608 B — 887 ms — h2https://live.blog-tags.st-hatena.com//_next/static/images/feature_add-tag-on-article-8f5132cfabb3f65b3df7f701a3b246fa.pnglive.blog-tags.st-hatena.com//_next... https://live.blog-tags.st-hatena.com//_next/static/images/feature_add-tag-on-article-8f5132cfabb3f65b3df7f701a3b246fa.png — 200 — 84.8 KiB — 892 ms — h2https://live.blog-tags.st-hatena.com//_next/static/images/connect-09625212c0af8fcf5e44ba67baf100ab.svglive.blog-tags.st-hatena.com//_next... https://live.blog-tags.st-hatena.com//_next/static/images/connect-09625212c0af8fcf5e44ba67baf100ab.svg — 200 — 570 B — 891 ms — h2https://live.blog-tags.st-hatena.com//_next/static/images/logo_hatenablog-66372581323c8b8b42013ecb6ce4ed3c.svglive.blog-tags.st-hatena.com//_next... https://live.blog-tags.st-hatena.com//_next/static/images/logo_hatenablog-66372581323c8b8b42013ecb6ce4ed3c.svg — 200 — 1.9 KiB — 887 ms — h2https://live.blog-tags.st-hatena.com//_next/static/images/dropdown-toggle-48acc6210a8563e4d5f3bd0eba7c9b03.svglive.blog-tags.st-hatena.com//_next... https://live.blog-tags.st-hatena.com//_next/static/images/dropdown-toggle-48acc6210a8563e4d5f3bd0eba7c9b03.svg — 200 — 389 B — 886 ms — h2https://live.blog-tags.st-hatena.com//_next/static/images/favicon-192-05f2ab3910776ea8e1aea414fc5257e4.pnglive.blog-tags.st-hatena.com//_next... https://live.blog-tags.st-hatena.com//_next/static/images/favicon-192-05f2ab3910776ea8e1aea414fc5257e4.png — 200 — 2.9 KiB — 229 ms — h2https://live.blog-tags.st-hatena.com//_next/static/images/favicon-8c3808340882afcb341562e33da12325.icolive.blog-tags.st-hatena.com//_next... https://live.blog-tags.st-hatena.com//_next/static/images/favicon-8c3808340882afcb341562e33da12325.ico — 200 — 3.8 KiB — 230 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
68% of JavaScript execution is third-party
First-party Third-party 1587ms · 456KB · ¥2192/mo
live.blog-tags.st-hatena.com
Other
Costly
Execution 486ms
Transfer 164 KB
Unused 56%
Monthly Cost ¥671/mo
Unattributable
Other
Costly
Execution 474ms
Transfer 0 KB
Monthly Cost ¥655/mo
Google Tag Manager
Tag Manager
Costly
Execution 284ms
Transfer 146 KB
Unused 44%
Monthly Cost ¥392/mo
Google Tag Manager
Tag Manager
Costly
Execution 262ms
Transfer 125 KB
Unused 51%
Monthly Cost ¥362/mo
Google Analytics
Analytics
Costly
Execution 81ms
Transfer 21 KB
Monthly Cost ¥112/mo

These scripts may cost more than they're worth

  • live.blog-tags.st-hatena.com adds 486ms and costs ~¥671/month
  • Unattributable adds 474ms and costs ~¥655/month
  • Google Tag Manager adds 284ms and costs ~¥392/month
  • Google Tag Manager adds 262ms and costs ~¥362/month
  • Google Analytics adds 81ms and costs ~¥112/month

68% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

live.blog-tags.st-hatena.com takes 486ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

56% of live.blog-tags.st-hatena.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

Unattributable takes 474ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 284ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 262ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

51% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

Google Analytics takes 81ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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