Performance
· 15 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.
5.77 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
7.29 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
58 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.024
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.77 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.
8.75 s
Page Load Progression
FPage Weight BudgetAction3.4 MB transferred, 339 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
DJS BundlesAction30 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/m202604210101/pubads_impl.js?cb=31098008 | 188 KB | 96 KB (51%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-QM5HX8W79Z&cx=c&_slc=1 | 148 KB | 66 KB (45%) | ✓ | 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://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/chunks/pages/_app-2737f5d6d0d2b230e5c9.js | 4 KB | — | ✓ | 3rd |
| https://www.hatena.ne.jp/_next/static/chunks/framework.bf835f192d9c4f88cfd8.js | 49 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 InventoryAction339 resources · 3.4 MB · 387 KB savings availableFIX
~387.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 339 resources | 3.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization115 images, 0 KB saveableREVIEW
CJS Execution CostAction1648ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.hatena.ne.jp/ | 744ms | 70ms | 0ms | 3rd |
| Unattributable | 337ms | 27ms | 0ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604210101/pubads_impl.js?cb=31098008 | 182ms | 154ms | 15ms | 3rd |
| https://www.hatena.ne.jp/_next/static/chunks/pages/index-abdab3dd89b4e3023f85.js | 104ms | 81ms | 19ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WPVF7X | 73ms | 54ms | 10ms | 3rd |
| https://cdn.pool.st-hatena.com/valve/valve.js | 54ms | 42ms | 8ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-6J1ZXVTZGY&cx=c&_slc=1 | 53ms | 44ms | 9ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-QM5HX8W79Z&cx=c&_slc=1 | 51ms | 41ms | 10ms | 3rd |
| https://btloader.com/tag?o=5085785915654144&upapi=true | 50ms | 45ms | 3ms | 3rd |
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 HintsNo optimization neededPASS
Network Waterfall339 requests over 9107msINFO
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 | 744ms | 51 KB | — | ¥1028/mo | Costly |
Unattributable Unattributable | Other | 337ms | 0 KB | — | ¥466/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 182ms | 188 KB | 51% | ¥251/mo | Costly |
www.hatena.ne.jp www.hatena.ne.jp | Other | 104ms | 180 KB | — | ¥143/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 73ms | 145 KB | 45% | ¥101/mo | Costly |
cdn.pool.st-hatena.com cdn.pool.st-hatena.com | Other | 54ms | 142 KB | 44% | ¥74/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 53ms | 148 KB | 44% | ¥73/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 51ms | 148 KB | 45% | ¥70/mo | Costly |
btloader.com btloader.com | Other | 50ms | 31 KB | — | ¥70/mo | Costly |
These scripts may cost more than they're worth
- www.hatena.ne.jp adds 744ms and costs ~¥1028/month
- Unattributable adds 337ms and costs ~¥466/month
- securepubads.g.doubleclick.net adds 182ms and costs ~¥251/month
- www.hatena.ne.jp adds 104ms and costs ~¥143/month
- Google Tag Manager adds 73ms and costs ~¥101/month
- cdn.pool.st-hatena.com adds 54ms and costs ~¥74/month
- Google Tag Manager adds 53ms and costs ~¥73/month
- Google Tag Manager adds 51ms and costs ~¥70/month
- btloader.com adds 50ms and costs ~¥70/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 744ms 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 337ms 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 182ms 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
51% 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 104ms 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 73ms 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 54ms 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 53ms 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 51ms 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 50ms 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