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.
4.60 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
16.00 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
423 ms
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.
5.85 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.
20.04 s
Page Load Progression
FPage Weight BudgetAction7.8 MB transferred, 64 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction3423ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://blog.seesaa.jp/ | 1481ms | 7ms | 2ms | 3rd |
| Unattributable | 724ms | 15ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-QJNE30TF4L | 351ms | 275ms | 58ms | 3rd |
| https://fundingchoicesmessages.google.com/i/21344574?ers=3 | 340ms | 305ms | 30ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 284ms | 203ms | 76ms | 3rd |
| https://www.googletagservices.com/tag/js/gpt.js | 114ms | 99ms | 15ms | 3rd |
| https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js | 73ms | 55ms | 12ms | 3rd |
| /_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads-contributor.ContributorServingResponseClientJs.en_US.DsKGN-qqfrQ.es5.O/d=1/rs=AJlcJMz2YRLcgcQw7bN4By8dD3CBlNJULw/m=kernel_loader,loader_js_executable | 55ms | 4ms | 0ms | 3rd |
DPage Weight InventoryAction64 resources · 7.8 MB · 259 KB savings availableFIX
~258.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 64 resources | 7.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization30 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CJS BundlesAction14 scripts, 259 KB unusedREVIEW
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 | 188 KB | 138 KB (73%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-QJNE30TF4L | 151 KB | 62 KB (41%) | ✓ | 3rd |
| https://fundingchoicesmessages.google.com/i/21344574?ers=3 | 70 KB | 37 KB (53%) | ✓ | 3rd |
| https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js | 34 KB | 23 KB (68%) | ✓ | 3rd |
| https://dmp.im-apps.net/sdk/im-uid.js | 3 KB | — | ✓ | 3rd |
| https://ad.ad-stir.com/ad?app_id=MEDIA-136253eb&ad_spot_no=32&locale=en&ut=1776813958816&topframe=1&origin=https%3A%2F%2Fblog.seesaa.jp%2F&secure=1&sw=412&sh=823&dpr=1.75&novideo=0&topurl=1&adstir_media_uid=b49685c3-df0d-4912-9a0c-cfb4f096d239&adstir_optout=1&c_vp=1&media_fq_count=1&callback=AdstirCB2958756996A414385020 | 0 KB | — | ✓ | 3rd |
| https://www.googletagservices.com/tag/js/gpt.js | 34 KB | — | ✓ | 3rd |
| https://js.ad-stir.com/js/adstir.js | 25 KB | — | ✓ | 3rd |
| https://blog.seesaa.jp/portal/js/sp.js?v=1.0.8 | 1 KB | — | ✓ | 3rd |
| https://fundingchoicesmessages.google.com/f/AGSKWxW8DZGIUwH6Jn5eU5YFNOBlXzCM_hpkt0veFRJSDbwhcoc4W7ulUsd2orubZ7KEhj9RkRNFB1B4evlClDXkaBbxlaaNPGz0rYuLF_KvQnhPeVlG1RaKRbAqzJErf0st-QOGgrgxgA==?fccs=W251bGwsbnVsbCxudWxsLG51bGwsbnVsbCxudWxsLFsxNzc2ODEzOTU5LDY3NTAwMDAwMF0sbnVsbCxudWxsLG51bGwsW251bGwsWzddXSwiaHR0cHM6Ly9ibG9nLnNlZXNhYS5qcC8iLG51bGwsW1s4LCJEc0tHTi1xcWZyUSJdLFs5LCJlbi1VUyJdLFsxOCwiW1tbbnVsbCwyOTA0XV1dIl0sWzM1LCIxNzc2ODEzOTU5Il0sWzE5LCIyIl0sWzE3LCJbMF0iXSxbMjQsIiJdLFsyNSwiW1s5NTM0MDI1Miw5NTM0MDI1NF1dIl0sWzI5LCJmYWxzZSJdXV0 | 2 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
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 Loading1 fonts (74 KB)PASS
Web fonts
1
74 KB total
Render-blocking
0
of 1
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
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall64 requests over 4977msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
blog.seesaa.jp blog.seesaa.jp | Other | 1481ms | 7 KB | — | ¥2046/mo | Costly |
Unattributable Unattributable | Other | 724ms | 0 KB | — | ¥1000/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 351ms | 151 KB | 41% | ¥485/mo | Costly |
fundingchoicesmessages.google.com fundingchoicesmessages.google.com | Other | 340ms | 70 KB | 53% | ¥469/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 284ms | 188 KB | 73% | ¥393/mo | Costly |
www.googletagservices.com www.googletagservices.com | Other | 114ms | 34 KB | — | ¥158/mo | Costly |
ajax.googleapis.com ajax.googleapis.com | Other | 73ms | 34 KB | 68% | ¥101/mo | Costly |
/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads-contributor.ContributorServingResponseClientJs.en_US.DsKGN-qqfrQ.es5.O/d=1/rs=AJlcJMz2YRLcgcQw7bN4By8dD3CBlNJULw/m=kernel_loader,loader_js_executable /_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads-contributor.ContributorServingResponseClientJs.en_US.DsKGN-qqfrQ.es5.O/d=1/rs=AJlcJMz2YRLcgcQw7bN4By8dD3CBlNJULw/m=kernel_loader,loader_js_executable | Other | 55ms | 0 KB | — | ¥76/mo | Costly |
These scripts may cost more than they're worth
- blog.seesaa.jp adds 1481ms and costs ~¥2046/month
- Unattributable adds 724ms and costs ~¥1000/month
- Google Tag Manager adds 351ms and costs ~¥485/month
- fundingchoicesmessages.google.com adds 340ms and costs ~¥469/month
- securepubads.g.doubleclick.net adds 284ms and costs ~¥393/month
- www.googletagservices.com adds 114ms and costs ~¥158/month
- ajax.googleapis.com adds 73ms and costs ~¥101/month
- /_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads-contributor.ContributorServingResponseClientJs.en_US.DsKGN-qqfrQ.es5.O/d=1/rs=AJlcJMz2YRLcgcQw7bN4By8dD3CBlNJULw/m=kernel_loader,loader_js_executable adds 55ms and costs ~¥76/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
blog.seesaa.jp takes 1481ms 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 724ms 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 351ms 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
fundingchoicesmessages.google.com takes 340ms 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
53% of fundingchoicesmessages.google.com'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
securepubads.g.doubleclick.net takes 284ms 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
73% 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.googletagservices.com takes 114ms 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
ajax.googleapis.com 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
68% of ajax.googleapis.com'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
/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads-contributor.ContributorServingResponseClientJs.en_US.DsKGN-qqfrQ.es5.O/d=1/rs=AJlcJMz2YRLcgcQw7bN4By8dD3CBlNJULw/m=kernel_loader,loader_js_executable takes 55ms 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