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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
16
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

11.47 s

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

11.77 s

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

2.33 s

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

0.229

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

11.47 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.

25.89 s

Page Load Progression

838 ms
1.7 s
2.5 s
3.4 s
4.2 s
5.0 s
5.9 s
6.7 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 132 requests
FIX
3.1 MB transferred, 132 requests
Warning::
Page weighs 7.2 MB (3.1 MB transferred)
Warning::
JavaScript is 1.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.6 MB
Info::
Fonts are 1.1 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.1 MB
Warning::
132 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.66 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
132 requests
0.66 g CO2 per page load
JavaScript 1.6 MiB 51%
Fonts 1.1 MiB 34%
Images 330.1 KiB 10%
HTML 63.0 KiB 2%
Other 32.6 KiB 1%
CSS 22.2 KiB 1%
Other 18.6 KiB 1%
Other 16.9 KiB 1%
Other 1.5 KiB 0%
Other 634 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
98% third-party, 0 ms blocking
FIX
98% third-party, 0 ms blocking
Warning::
Third-party code accounts for 98% of page weight (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
F
JS Execution Cost
Action
7642ms total JS execution
FIX
7642ms total JS execution
Warning::
https://cdn.qiita.com/assets/public/v3-home-bundle...: 2012ms CPU time
Warning::
https://qiita.com/: 1696ms CPU time
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 1216ms CPU time
Warning::
Unattributable: 1027ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-KEVS...: 393ms CPU time
Warning::
Third-party scripts: 5946ms (78% of total)

Main Thread Breakdown

Script Evaluation 52% Style & Layout 17% Other 15% Script Parsing & Compilation 9% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://cdn.qiita.com/assets/public/v3-home-bundle-5a77673f50e2e557.min.js2012ms1709ms237ms3rd
https://qiita.com/1696ms143ms2ms1st
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js1216ms695ms82ms3rd
Unattributable1027ms102ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-KEVS5DBRVN393ms317ms72ms3rd
https://fam.adingo.jp/bid-strap/qiita/pb.js369ms226ms135ms3rd
https://fundingchoicesmessages.google.com/i/383564218?ers=3348ms305ms38ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KX3Q99SS&l=itm_dl1_1014416266ms203ms52ms3rd
https://c.amazon-adsystem.com/aax2/apstag.js156ms97ms43ms3rd
https://www.googletagservices.com/tag/js/gpt.js105ms88ms16ms3rd

Showing top 10 of 11 scripts

F
JS Bundles
Action
34 scripts, 601 KB unused
FIX
34 scripts, 601 KB unused
Warning::
https://cdn.qiita.com/assets/public/v3-home-bundle...: 193 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://fam.adingo.jp/bid-strap/qiita/pb.js: 96 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 94 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KX3...: 65 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-KEVS...: 65 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 601 KB
601 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.qiita.com/assets/public/v3-home-bundle-5a77673f50e2e557.min.js492 KB193 KB (41%)✓3rd
https://fam.adingo.jp/bid-strap/qiita/pb.js204 KB96 KB (47%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js188 KB94 KB (50%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KX3Q99SS&l=itm_dl1_1014416139 KB65 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-KEVS5DBRVN177 KB65 KB (37%)✓3rd
https://c.amazon-adsystem.com/aax2/apstag.js91 KB51 KB (57%)✓3rd
https://fundingchoicesmessages.google.com/i/383564218?ers=370 KB36 KB (53%)✓3rd
https://pagead2.googlesyndication.com/pagead/js/google_top_exp.js?fcd=true0 KB—✓3rd
https://sync.im-apps.net/imid/segment?callback=_itm_.c1014416.ia_cb&token=VXoW9wEaCAYxiIkb8Mzm7Q&need_created=True1 KB—✓3rd
https://fundingchoicesmessages.google.com/f/AGSKWxVyHZNZ0MUWqCgbyLhERD2Tp11aBG-qJ-EjO4UykK-0-kcrZMUAHkJUa3Y5tk7PdAjnEng5KVUSABAHpTWP3ausXybXz7EkycaXQi1ca3s2X6TG2_nBYyAjuCysaBWvPxTLbdSxbQ==?fccs=W251bGwsbnVsbCxudWxsLG51bGwsbnVsbCxudWxsLFsxNzc2ODEwMjA2LDU4NTAwMDAwMF0sbnVsbCxudWxsLG51bGwsW251bGwsWzddXSwiaHR0cHM6Ly9xaWl0YS5jb20vIixudWxsLFtbOCwiRHNLR04tcXFmclEiXSxbOSwiZW4tVVMiXSxbMTgsIltbW251bGwsMTc3M11dXSJdLFszNSwiMTc3NjgxMDIwNiJdLFsxOSwiMiJdLFsxNywiWzBdIl0sWzI0LCIiXSxbMjksImZhbHNlIl1dXQ2 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

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

F
Page Weight Inventory
Action
132 resources · 3.1 MB · 601 KB savings available
FIX
132 resources · 3.1 MB · 601 KB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~601 KB of savings available
Warning::
130 third-party resources (98% of weight)
Info::
3 resources over 200KB
132 resources · 3.1 MiB · 130 third-party 2.1 MiB over 1MB target
JavaScript 51% · 1.6 MiB
Font 34% · 1.1 MiB
Image 11% · 339.6 KiB
Document 2% · 63.5 KiB
Other 2% · 57.2 KiB
CSS 1% · 22.2 KiB

~600.7 KiB of savings available

Remove unused JavaScript: 600.7 KiB
B
Image Optimization
46 images, 0 KB saveable
REVIEW
46 images, 0 KB saveable
Info::
All images are well-optimized
46 images 330 KB
0 oversized -0 KB
15 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0, private, must-revalidate
REVIEW
max-age=0, private, must-revalidate
Info::
Cache-Control header is set
Got: max-age=0, private, must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

max-age=0, private, must-revalidate

DirectiveValueMeaning
max-age0Cache for 0 seconds
private—Only browser cache, not CDN/proxy
must-revalidate—Must recheck with server after expiry
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
1 fonts (1080 KB)
PASS
1 fonts (1080 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

1080 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 11.5 s LCP 11.8 shttps://fonts.gstatic.com/s/materialsymbolsoutlined/v328/kJEPBvYX7BgnkSrUwT8OhrdQw4oELdPIeeII9v6oDMzB_guZ5QyRzayHcfdY40yxrjGyv3fzR1BO1USv9ls.woff2kJEPBvYX7BgnkSrUwT8Ohrd... https://fonts.gstatic.com/s/materialsymbolsoutlined/v328/kJEPBvYX7BgnkSrUwT8OhrdQw4oELdPIeeII9v6oDMzB_guZ5QyRzayHcfdY40yxrjGyv3fzR1BO1USv9ls.woff2 — 1.1 MiB — 54 ms — font-display: swap
kJEPBvYX7BgnkSrUwT8Ohrd... woff2 swap
Size 1080 KB
Load time 54 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~540 KB and ~1080 ms

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
1
preload
4
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
132 requests over 8679ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 11.5 s LCP 11.8 shttps://qiita.com// https://qiita.com/ — 200 — 53.4 KiB — 1.6 s — h2https://cdn.qiita.com/assets/public/home-f953b5f2fbd15f46f0403b1a0f34d0c5.min.csscdn.qiita.com/assets/public/home-f9... https://cdn.qiita.com/assets/public/home-f953b5f2fbd15f46f0403b1a0f34d0c5.min.css — 200 — 15.2 KiB — 456 ms — h2https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@24,500,0..1,-25..0fonts.googleapis.com/css2?family=Ma... https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@24,500,0..1,-25..0 — 200 — 880 B — 124 ms — h2https://www.googletagservices.com/tag/js/gpt.jswww.googletagservices.com/tag/js/gp... https://www.googletagservices.com/tag/js/gpt.js — 200 — 34.0 KiB — 133 ms — h2https://fam.adingo.jp/bid-strap/qiita/pb.jsfam.adingo.jp/bid-strap/qiita/pb.js https://fam.adingo.jp/bid-strap/qiita/pb.js — 200 — 203.7 KiB — 625 ms — h2https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.csscdnjs.cloudflare.com/ajax/libs/font... https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css — 200 — 6.1 KiB — 22 ms — h3https://qiita-official-contents.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-official-event-image%2F97a29708127f06ce157bb87df2d47112ca4261f2%2Foriginal.jpg%3F1776776937?ixlib=rb-4.0.0&auto=compress%2Cformat&s=f84cf68c3318a77e4398350c13f24bc4qiita-official-contents.imgix.net/h... https://qiita-official-contents.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-official-event-image%2F97a29708127f06ce157bb87df2d47112ca4261f2%2Foriginal.jpg%3F1776776937?ixlib=rb-4.0.0&auto=compress%2Cformat&s=f84cf68c3318a77e4398350c13f24bc4 — 200 — 39.4 KiB — 206 ms — h2https://cdn.qiita.com/assets/public/image-qiitan_with_books-43132dc7314c18372a299035e2bb399f.pngcdn.qiita.com/assets/public/image-q... https://cdn.qiita.com/assets/public/image-qiitan_with_books-43132dc7314c18372a299035e2bb399f.png — 200 — 15.6 KiB — 427 ms — h2https://qiita-official-contents.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-official-event-image%2F31419e0986ddde58a493d897e4a43b9f34a6924b%2Foriginal.jpg%3F1774247209?ixlib=rb-4.0.0&auto=compress%2Cformat&s=ad4108451ffd81a8e067dc811824e77fqiita-official-contents.imgix.net/h... https://qiita-official-contents.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-official-event-image%2F31419e0986ddde58a493d897e4a43b9f34a6924b%2Foriginal.jpg%3F1774247209?ixlib=rb-4.0.0&auto=compress%2Cformat&s=ad4108451ffd81a8e067dc811824e77f — 200 — 7.9 KiB — 66 ms — h2https://qiita-official-contents.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-official-event-image%2F5aec1cbc211363eb10f82f40c4a134f489f74110%2Foriginal.jpg%3F1775790509?ixlib=rb-4.0.0&auto=compress%2Cformat&s=3b42be5335b5898a9db6edc70bef0a71qiita-official-contents.imgix.net/h... https://qiita-official-contents.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-official-event-image%2F5aec1cbc211363eb10f82f40c4a134f489f74110%2Foriginal.jpg%3F1775790509?ixlib=rb-4.0.0&auto=compress%2Cformat&s=3b42be5335b5898a9db6edc70bef0a71 — 200 — 6.2 KiB — 64 ms — h2https://qiita-official-contents.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-official-event-image%2Fa7494bab3ad55e6fb1a3647886b3fba615334615%2Foriginal.jpg%3F1776218628?ixlib=rb-4.0.0&auto=compress%2Cformat&s=68f91998fd06e1c693c372b0ea78e5c6qiita-official-contents.imgix.net/h... https://qiita-official-contents.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-official-event-image%2Fa7494bab3ad55e6fb1a3647886b3fba615334615%2Foriginal.jpg%3F1776218628?ixlib=rb-4.0.0&auto=compress%2Cformat&s=68f91998fd06e1c693c372b0ea78e5c6 — 200 — 8.8 KiB — 63 ms — h2https://cdn.qiita.com/assets/public/v3-home-bundle-5a77673f50e2e557.min.jscdn.qiita.com/assets/public/v3-home... https://cdn.qiita.com/assets/public/v3-home-bundle-5a77673f50e2e557.min.js — 200 — 492.5 KiB — 847 ms — h2https://qiita-tag-images.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-tag-image%2F3a2d84459fcd4baa1ad8878fd96c7163309e701e%2Foriginal.jpg%3F1501238161?ixlib=rb-4.0.0&auto=compress%2Cformat&lossless=0&w=32&h=32&s=0ee6cf21e325d1ee471e266bbc4fdc99qiita-tag-images.imgix.net/https%3A... https://qiita-tag-images.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-tag-image%2F3a2d84459fcd4baa1ad8878fd96c7163309e701e%2Foriginal.jpg%3F1501238161?ixlib=rb-4.0.0&auto=compress%2Cformat&lossless=0&w=32&h=32&s=0ee6cf21e325d1ee471e266bbc4fdc99 — 200 — 1.6 KiB — 78 ms — h2https://qiita-tag-images.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-tag-image%2F4f7f91cf16d0186d7fe29f0fcb59de8c87bcdd12%2Foriginal.jpg%3F1752145324?ixlib=rb-4.0.0&auto=compress%2Cformat&lossless=0&w=32&h=32&s=a96437be466efff91d1c31a9ee469a84qiita-tag-images.imgix.net/https%3A... https://qiita-tag-images.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-tag-image%2F4f7f91cf16d0186d7fe29f0fcb59de8c87bcdd12%2Foriginal.jpg%3F1752145324?ixlib=rb-4.0.0&auto=compress%2Cformat&lossless=0&w=32&h=32&s=a96437be466efff91d1c31a9ee469a84 — 200 — 1.2 KiB — 81 ms — h2https://qiita-tag-images.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-tag-image%2F050c0f328a785fa1e6ef905c25202a81b95cbce8%2Foriginal.jpg%3F1660803670?ixlib=rb-4.0.0&auto=compress%2Cformat&lossless=0&w=32&h=32&s=d7b51e57960fb087ee1c05495732a20aqiita-tag-images.imgix.net/https%3A... https://qiita-tag-images.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-tag-image%2F050c0f328a785fa1e6ef905c25202a81b95cbce8%2Foriginal.jpg%3F1660803670?ixlib=rb-4.0.0&auto=compress%2Cformat&lossless=0&w=32&h=32&s=d7b51e57960fb087ee1c05495732a20a — 200 — 1.2 KiB — 76 ms — h2https://qiita-tag-images.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-tag-image%2F352159020d13d7b8a590edbc15f76694f6c977b9%2Foriginal.jpg%3F1650353640?ixlib=rb-4.0.0&auto=compress%2Cformat&lossless=0&w=32&h=32&s=98b76b9b8a4548e410c67b9596918e57qiita-tag-images.imgix.net/https%3A... https://qiita-tag-images.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-tag-image%2F352159020d13d7b8a590edbc15f76694f6c977b9%2Foriginal.jpg%3F1650353640?ixlib=rb-4.0.0&auto=compress%2Cformat&lossless=0&w=32&h=32&s=98b76b9b8a4548e410c67b9596918e57 — 200 — 1.2 KiB — 78 ms — h2https://qiita.com/manifest.json/manifest.json https://qiita.com/manifest.json — 200 — 1.5 KiB — 799 ms — h2https://qiita-tag-images.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-tag-image%2Ff4f2d94cd53d0bc382e64843f17beeabea23e366%2Foriginal.jpg%3F1650353581?ixlib=rb-4.0.0&auto=compress%2Cformat&lossless=0&w=32&h=32&s=57fd3c1470a8ae4512333c1e54a66192qiita-tag-images.imgix.net/https%3A... https://qiita-tag-images.imgix.net/https%3A%2F%2Fs3-ap-northeast-1.amazonaws.com%2Fqiita-tag-image%2Ff4f2d94cd53d0bc382e64843f17beeabea23e366%2Foriginal.jpg%3F1650353581?ixlib=rb-4.0.0&auto=compress%2Cformat&lossless=0&w=32&h=32&s=57fd3c1470a8ae4512333c1e54a66192 — 200 — 1.1 KiB — 9 ms — 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https://sync.im-apps.net/imid/segment?callback=_itm_.c1014416.ia_cb&token=VXoW9wEaCAYxiIkb8Mzm7Q&need_created=True — 200 — 782 B — 387 ms — http/1.1https://b6.im-apps.net/pv/vtPGNZ?cid=1014416&url=https%3A%2F%2Fqiita.com%2F&ref=&title=Qiita&lang=en-usb6.im-apps.net/pv/vtPGNZ?cid=101441... https://b6.im-apps.net/pv/vtPGNZ?cid=1014416&url=https%3A%2F%2Fqiita.com%2F&ref=&title=Qiita&lang=en-us — 302 — 201 B — 299 ms — h2https://b.im-apps.net/pv/vtPGNZ?cid=1014416&ehid=2mEWwKfOlVsdPC6Y&lang=en-us&ref&title=Qiita&url=https%3A%2F%2Fqiita.com%2Fb.im-apps.net/pv/vtPGNZ?cid=1014416... https://b.im-apps.net/pv/vtPGNZ?cid=1014416&ehid=2mEWwKfOlVsdPC6Y&lang=en-us&ref&title=Qiita&url=https%3A%2F%2Fqiita.com%2F — 200 — 231 B — 321 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-KX3Q99SS&l=itm_dl1_1014416www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-KX3Q99SS&l=itm_dl1_1014416 — 200 — 139.3 KiB — 258 ms — 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h3https://www.googletagservices.com/dcm/impl_v106.jswww.googletagservices.com/dcm/impl_... https://www.googletagservices.com/dcm/impl_v106.js — 200 — 26.4 KiB — 9 ms — 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https://ad.doubleclick.net/ddm/adj/N4481.3889363QIITA/B24668930.423559167;dc_ver=106.314;sz=300x250;u_sd=1;gdpr=0;nel=1;dc_adk=1224470513;ord=bo1x80;click=https%3A%2F%2Fadclick.g.doubleclick.net%2Fpcs%2Fclick%3Fxai%3DAKAOjss4PVdSVmHPQzeET0xOSVVHT19C8ZJhwRVo60ue5ZtDY1CoqWb8g2GmnpitlIXVU11S2o7VyyFr5OzSTIaMkdrtSm_qCUu6WnGICg3ecUI-n9FW9F-Jjzcqf1_6RfhL8YB77ce-b8l-Djvd7WePBNprVM14h1k1dvnH_5ZbncZgPTHcQstk5Q5ltr2c13xct3rPYO0h965rmH0lBbyuxmAI31dMrZfWyz1DP20A1oiMnPks0t0ePd88WLiqMLRWEZlImchIm2Q-dxt2DKDNf1jvq785F0IGkkjLbmMrEMoFC9Vx3sngytDHM4ShERIfzrGd-NhRSH5zc4VZySQIcofzcveleJgzRfj9ecEr8zi8qwJ0nxtRzrpjPAnoCMEdBe5nyfKP9usu5M6sPeEIIWZTe8rHnZ4YOpgzWjg%26sai%3DAMfl-YSTSkS6tfnOlTKG9ha4xfzkrvNVljNfMGtCOkBzwsXHCcQDzf-ZWGKWY0143I4Djs_LNtLCnkIPzqBAyYp92txZJxPlROqdHc0wWntNfWS3VthCdGT0M3IYmYigTrWmWsOsSXRm6Xq-eIU7pnr_t9tsUarRtti42D5lBy_AkwWs92CTI_5wvE2_Ly5h3viY2HJN6J-cmyDQAQB-0B6RbkWZ37Xh9gwY5ip9sFWgNiZJFe7ny06F6frrhybc1_lJFYNFIkBe_9WgMFjPzz7D5FKs-2Vh19XYo6gqjw32HBHKCzH-KyUeD82hAWVI%26sig%3DCg0ArKJSzHUYoUQ1PrS2EAE%26fbs_aeid%3D%255Bgw_fbsaeid%255D%26urlfix%3D1%26adurl%3D;uach=WyJMaW51eCIsIiIsIng4NiIsIiIsIjE0Ni4wLjc2ODAuMTY0IixudWxsLDAsbnVsbCwiNjQiLFtbIk5vdC1BLkJyYW5kIiwiMjQuMC4wLjAiXSxbIkNocm9taXVtIiwiMTQ2LjAuNzY4MC4xNjQiXV0sMF0.;dc_rfl=1,https%3A%2F%2Fqiita.com%2F$0;xdt=1;crlt=aPnqDId2yK;cmpl=8;gcsr=m;stc=1;chaa=1;sttr=31;prcl=s — -1 — 0 B — 0 ms — https://ep2.adtrafficquality.google/generate_204?F78mxAep2.adtrafficquality.google/generat... https://ep2.adtrafficquality.google/generate_204?F78mxA — 204 — 40 B — 4 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
78% of JavaScript execution is third-party
First-party Third-party 5946ms · 1403KB · ¥8216/mo
cdn.qiita.com
Other
Costly
Execution 2012ms
Transfer 492 KB
Unused 41%
Monthly Cost ¥2780/mo
securepubads.g.doubleclick.net
Other
Costly
Execution 1216ms
Transfer 188 KB
Unused 50%
Monthly Cost ¥1680/mo
Unattributable
Other
Costly
Execution 1027ms
Transfer 0 KB
Monthly Cost ¥1419/mo
Google Tag Manager
Tag Manager
Costly
Execution 393ms
Transfer 177 KB
Unused 37%
Monthly Cost ¥543/mo
fam.adingo.jp
Other
Costly
Execution 369ms
Transfer 204 KB
Unused 47%
Monthly Cost ¥510/mo
fundingchoicesmessages.google.com
Other
Costly
Execution 348ms
Transfer 70 KB
Unused 53%
Monthly Cost ¥481/mo
Google Tag Manager
Tag Manager
Costly
Execution 266ms
Transfer 139 KB
Unused 47%
Monthly Cost ¥368/mo
c.amazon-adsystem.com
Other
Costly
Execution 156ms
Transfer 91 KB
Unused 57%
Monthly Cost ¥215/mo
www.googletagservices.com
Other
Costly
Execution 105ms
Transfer 34 KB
Monthly Cost ¥145/mo
ep2.adtrafficquality.google
Other
Costly
Execution 53ms
Transfer 8 KB
Monthly Cost ¥74/mo

These scripts may cost more than they're worth

  • cdn.qiita.com adds 2012ms and costs ~¥2780/month
  • securepubads.g.doubleclick.net adds 1216ms and costs ~¥1680/month
  • Unattributable adds 1027ms and costs ~¥1419/month
  • Google Tag Manager adds 393ms and costs ~¥543/month
  • fam.adingo.jp adds 369ms and costs ~¥510/month
  • fundingchoicesmessages.google.com adds 348ms and costs ~¥481/month
  • Google Tag Manager adds 266ms and costs ~¥368/month
  • c.amazon-adsystem.com adds 156ms and costs ~¥215/month
  • www.googletagservices.com adds 105ms and costs ~¥145/month
  • ep2.adtrafficquality.google adds 53ms and costs ~¥74/month

78% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

cdn.qiita.com takes 2012ms 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

securepubads.g.doubleclick.net takes 1216ms 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

50% of securepubads.g.doubleclick.net'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 1027ms 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 393ms 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

fam.adingo.jp takes 369ms 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

fundingchoicesmessages.google.com takes 348ms 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

53% of fundingchoicesmessages.google.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

Google Tag Manager takes 266ms 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

c.amazon-adsystem.com takes 156ms 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

57% of c.amazon-adsystem.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

www.googletagservices.com takes 105ms 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

ep2.adtrafficquality.google takes 53ms 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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