Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
8.87 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
21.57 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.22 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.015
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
12.66 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.
29.65 s
Page Load Progression
719 ms 1.4 s 2.2 s
2.9 s
3.6 s
4.3 s
5.0 s
5.8 sFPage Weight BudgetAction3.4 MB transferred, 358 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
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.
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.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction7042ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.hatena.ne.jp/ | 3071ms | 387ms | 2ms | 3rd |
| Unattributable | 1517ms | 103ms | 0ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31097945 | 755ms | 673ms | 46ms | 3rd |
| https://www.hatena.ne.jp/_next/static/chunks/pages/index-abdab3dd89b4e3023f85.js | 393ms | 313ms | 72ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-QM5HX8W79Z&cx=c&_slc=1 | 234ms | 189ms | 43ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-6J1ZXVTZGY&cx=c&_slc=1 | 231ms | 189ms | 41ms | 3rd |
| https://cdn.pool.st-hatena.com/valve/valve.js | 218ms | 169ms | 37ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WPVF7X | 216ms | 161ms | 47ms | 3rd |
| https://btloader.com/tag?o=5085785915654144&upapi=true | 134ms | 121ms | 8ms | 3rd |
| https://securepubads.g.doubleclick.net/tag/js/gpt.js | 101ms | 91ms | 9ms | 3rd |
Showing top 10 of 12 scripts
DJS BundlesAction34 scripts, 387 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31097945 | 188 KB | 97 KB (52%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-6J1ZXVTZGY&cx=c&_slc=1 | 148 KB | 65 KB (44%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WPVF7X | 145 KB | 65 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-QM5HX8W79Z&cx=c&_slc=1 | 148 KB | 64 KB (43%) | ✓ | 3rd |
| https://cdn.pool.st-hatena.com/valve/valve.js | 142 KB | 62 KB (44%) | ✓ | 3rd |
| https://www.hatena.ne.jp/_next/static/chunks/67557a23317708ba96c9e9ef98fcd1f133202f11.a9aa7bcec9726b59b94e.js | 50 KB | 34 KB (69%) | ✓ | 3rd |
| https://www.hatena.ne.jp/_next/static/iRxb0QyunnSh9N0HoZUu-/_ssgManifest.js | 1 KB | — | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/tag/js/gpt.js | 34 KB | — | ✓ | 3rd |
| https://www.hatena.ne.jp/_next/static/chunks/71247caf95475e3ea7f9a0f8a30beb258b23d005.5c75bf83ded413fb678f.js | 4 KB | — | ✓ | 3rd |
| https://www.hatena.ne.jp/_next/static/chunks/pages/index-abdab3dd89b4e3023f85.js | 180 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
DPage Weight InventoryAction358 resources · 3.4 MB · 387 KB savings availableFIX
~386.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 358 resources | 3.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization118 images, 0 KB saveableREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading53 fonts (1050 KB)PASS
Web fonts
53
1050 KB total
Render-blocking
0
of 53
Dominant font-display
swap
Most common across fonts
Font loading timeline
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)
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints12 hints, 0 missing preconnectsPASS
Current Resource Hints
12 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall358 requests over 9112msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.hatena.ne.jp www.hatena.ne.jp | Other | 3071ms | 51 KB | — | ¥4244/mo | Costly |
Unattributable Unattributable | Other | 1517ms | 0 KB | — | ¥2097/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 755ms | 188 KB | 52% | ¥1044/mo | Costly |
www.hatena.ne.jp www.hatena.ne.jp | Other | 393ms | 180 KB | — | ¥544/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 234ms | 148 KB | 43% | ¥324/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 231ms | 148 KB | 44% | ¥320/mo | Costly |
cdn.pool.st-hatena.com cdn.pool.st-hatena.com | Other | 218ms | 142 KB | 44% | ¥301/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 216ms | 145 KB | 45% | ¥299/mo | Costly |
btloader.com btloader.com | Other | 134ms | 31 KB | — | ¥186/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 101ms | 34 KB | — | ¥140/mo | Costly |
Google Analytics www.google-analytics.com | Analytics | 91ms | 21 KB | — | ¥125/mo | Costly |
www.hatena.ne.jp www.hatena.ne.jp | Other | 79ms | 49 KB | — | ¥109/mo | Costly |
These scripts may cost more than they're worth
- www.hatena.ne.jp adds 3071ms and costs ~¥4244/month
- Unattributable adds 1517ms and costs ~¥2097/month
- securepubads.g.doubleclick.net adds 755ms and costs ~¥1044/month
- www.hatena.ne.jp adds 393ms and costs ~¥544/month
- Google Tag Manager adds 234ms and costs ~¥324/month
- Google Tag Manager adds 231ms and costs ~¥320/month
- cdn.pool.st-hatena.com adds 218ms and costs ~¥301/month
- Google Tag Manager adds 216ms and costs ~¥299/month
- btloader.com adds 134ms and costs ~¥186/month
- securepubads.g.doubleclick.net adds 101ms and costs ~¥140/month
- Google Analytics adds 91ms and costs ~¥125/month
- www.hatena.ne.jp adds 79ms and costs ~¥109/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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
www.hatena.ne.jp takes 3071ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 1517ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
securepubads.g.doubleclick.net takes 755ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
52% of securepubads.g.doubleclick.net's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
www.hatena.ne.jp takes 393ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 234ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 231ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
cdn.pool.st-hatena.com takes 218ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 216ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
btloader.com takes 134ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
securepubads.g.doubleclick.net takes 101ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Analytics takes 91ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.hatena.ne.jp takes 79ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev