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.
4.38 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
15.81 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.30 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.451
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
9.21 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.
17.25 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction4974ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.xrea.com/ | 1308ms | 12ms | 2ms | 3rd |
| Unattributable | 733ms | 11ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-J8YE7Q8ZQD&cx=c>m=4e64h1 | 513ms | 382ms | 66ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MX3Z3RD | 510ms | 395ms | 98ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 376ms | 337ms | 11ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-964065619&cx=c>m=4e64h1 | 363ms | 300ms | 58ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-4BPL9F4S2N&cx=c>m=4e64h1 | 331ms | 269ms | 58ms | 3rd |
| https://www.google-analytics.com/analytics.js | 232ms | 168ms | 11ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WF6CJZ8 | 172ms | 126ms | 45ms | 3rd |
| https://cache.img.gmo.jp/gmo/header/script.min.js | 132ms | 22ms | 5ms | 3rd |
Showing top 10 of 14 scripts
DPage Weight InventoryAction119 resources · 2.0 MB · 295 KB savings availableFIX
~294.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 119 resources | 2.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction2.0 MB transferred, 119 requestsREVIEW
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
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
CImage OptimizationAction62 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
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
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
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
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
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
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 BundlesAction26 scripts, 295 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-J8YE7Q8ZQD&cx=c>m=4e64h1 | 174 KB | 65 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WF6CJZ8 | 113 KB | 63 KB (56%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-4BPL9F4S2N&cx=c>m=4e64h1 | 155 KB | 61 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-964065619&cx=c>m=4e64h1 | 146 KB | 56 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MX3Z3RD | 175 KB | 50 KB (29%) | ✓ | 3rd |
| https://cache.img.gmo.jp/gmo/header/script.min.js | 11 KB | — | ✓ | 3rd |
| https://static.ads-twitter.com/uwt.js | 13 KB | — | ✓ | 3rd |
| https://cache.img.gmo.jp/gmo/security/script.min.js | 3 KB | — | ✓ | 3rd |
| https://gmo-cybersecurity.com/siteseal/siteseal.js | 3 KB | — | ✓ | 3rd |
| https://cache.img.gmo.jp/gmo/footer/script.min.js | 6 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
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 LoadingNo web fonts (system fonts)PASS
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 Waterfall119 requests over 7598msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.xrea.com www.xrea.com | Other | 1308ms | 10 KB | — | ¥1808/mo | Costly |
Unattributable Unattributable | Other | 733ms | 0 KB | — | ¥1013/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 513ms | 174 KB | 38% | ¥709/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 510ms | 175 KB | 29% | ¥705/mo | Costly |
Microsoft Clarity scripts.clarity.ms | Session Replay | 376ms | 26 KB | — | ¥520/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 363ms | 146 KB | 38% | ¥501/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 331ms | 155 KB | 39% | ¥458/mo | Costly |
Google Analytics www.google-analytics.com | Analytics | 232ms | 21 KB | — | ¥320/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 172ms | 113 KB | 56% | ¥238/mo | Costly |
cache.img.gmo.jp cache.img.gmo.jp | Other | 132ms | 11 KB | — | ¥182/mo | Costly |
code.jquery.com code.jquery.com | Other | 92ms | 31 KB | — | ¥127/mo | Costly |
www.xrea.com www.xrea.com | Other | 80ms | 0 KB | — | ¥110/mo | Costly |
Twitter/X Pixel static.ads-twitter.com | Advertising | 72ms | 13 KB | — | ¥99/mo | Costly |
cache.img.gmo.jp cache.img.gmo.jp | Other | 59ms | 6 KB | — | ¥81/mo | Costly |
These scripts may cost more than they're worth
- www.xrea.com adds 1308ms and costs ~¥1808/month
- Unattributable adds 733ms and costs ~¥1013/month
- Google Tag Manager adds 513ms and costs ~¥709/month
- Google Tag Manager adds 510ms and costs ~¥705/month
- Microsoft Clarity adds 376ms and costs ~¥520/month
- Google Tag Manager adds 363ms and costs ~¥501/month
- Google Tag Manager adds 331ms and costs ~¥458/month
- Google Analytics adds 232ms and costs ~¥320/month
- Google Tag Manager adds 172ms and costs ~¥238/month
- cache.img.gmo.jp adds 132ms and costs ~¥182/month
- code.jquery.com adds 92ms and costs ~¥127/month
- www.xrea.com adds 80ms and costs ~¥110/month
- Twitter/X Pixel adds 72ms and costs ~¥99/month
- cache.img.gmo.jp adds 59ms and costs ~¥81/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.xrea.com takes 1308ms 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 733ms 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 513ms 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 510ms 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
Microsoft Clarity takes 376ms 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 363ms 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 331ms 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 232ms 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 172ms 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
56% of Google Tag Manager'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
cache.img.gmo.jp takes 132ms 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
code.jquery.com takes 92ms 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.xrea.com takes 80ms 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
Twitter/X Pixel takes 72ms 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
cache.img.gmo.jp takes 59ms 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