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.
6.99 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
27.57 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.21 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.365
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
9.78 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.
48.89 s
Page Load Progression
FPage Weight BudgetAction9.7 MB transferred, 277 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
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 CostAction9148ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.so-net.ne.jp/ | 2271ms | 63ms | 3ms | 3rd |
| Unattributable | 1593ms | 198ms | 0ms | 3rd |
| https://assets.adobedtm.com/17361013af29ef6ae83ffd4113ce414f44be89b8/satelliteLib-ea3bae92bad6869bca2ee96094be75c242840f35.js | 693ms | 537ms | 115ms | 3rd |
| https://www.so-net.ne.jp/assets/scripts/common.js | 530ms | 174ms | 9ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5QL4TN8 | 435ms | 335ms | 60ms | 3rd |
| https://www.so-net.ne.jp/assets/scripts/emergency.js | 398ms | 385ms | 3ms | 3rd |
| https://bs.karte.io/action/__script-action/latest/index.js | 284ms | 255ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-FFF2L11TTY&cx=c>m=4e64h1 | 268ms | 217ms | 38ms | 3rd |
| https://connect.facebook.net/signals/config/1288877828691592?v=2.9.303&r=stable&domain=www.so-net.ne.jp&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168 | 258ms | 216ms | 31ms | 3rd |
| https://cdn-edge.karte.io/__edge_plugins/context_event/index.js | 244ms | 237ms | 1ms | 3rd |
Showing top 10 of 28 scripts
FJS BundlesAction64 scripts, 869 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/destination?id=AW-1056115045&cx=c>m=4e64k0h2 | 145 KB | 69 KB (48%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-11036283457&cx=c>m=4e64k0h2 | 145 KB | 69 KB (47%) | ✓ | 3rd |
| https://assets.adobedtm.com/17361013af29ef6ae83ffd4113ce414f44be89b8/satelliteLib-ea3bae92bad6869bca2ee96094be75c242840f35.js | 275 KB | 67 KB (25%) | ✓ | 3rd |
| https://www.so-net.ne.jp/assets/scripts/emergency.js | 191 KB | 66 KB (35%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=UA-35505952-6 | 125 KB | 64 KB (51%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-FFF2L11TTY&cx=c>m=4e64h1 | 158 KB | 63 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-LFLR66P29B&cx=c>m=4e64k0h2 | 146 KB | 62 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-9591676 | 129 KB | 60 KB (47%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-17958994411&cx=c>m=4e64h1 | 137 KB | 60 KB (44%) | ✓ | 3rd |
| https://ce.mf.marsflag.com/v1/js/mf-search.js | 110 KB | 57 KB (52%) | ✓ | 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
FPage Weight InventoryAction277 resources · 9.7 MB · 869 KB savings availableFIX
~869.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 277 resources | 9.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction131 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
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 (71 KB)PASS
Web fonts
1
71 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)
Fixing the unchecked items could save ~21 KB and ~42 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints1 hints, 0 missing preconnectsPASS
Current Resource Hints
1 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall277 requests over 8428msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.so-net.ne.jp www.so-net.ne.jp | Other | 2271ms | 15 KB | — | ¥3138/mo | Costly |
Unattributable Unattributable | Other | 1593ms | 0 KB | — | ¥2201/mo | Costly |
assets.adobedtm.com assets.adobedtm.com | Other | 693ms | 275 KB | 25% | ¥958/mo | Costly |
www.so-net.ne.jp www.so-net.ne.jp | Other | 530ms | 33 KB | — | ¥732/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 435ms | 166 KB | 32% | ¥601/mo | Costly |
www.so-net.ne.jp www.so-net.ne.jp | Other | 398ms | 191 KB | 35% | ¥550/mo | Costly |
bs.karte.io bs.karte.io | Other | 284ms | 4 KB | — | ¥393/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 268ms | 158 KB | 40% | ¥371/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 258ms | 125 KB | 29% | ¥356/mo | Costly |
cdn-edge.karte.io cdn-edge.karte.io | Other | 244ms | 28 KB | — | ¥337/mo | Costly |
analytics.tiktok.com analytics.tiktok.com | Other | 201ms | 106 KB | 54% | ¥278/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 194ms | 146 KB | 42% | ¥268/mo | Costly |
ce.mf.marsflag.com ce.mf.marsflag.com | Other | 193ms | 110 KB | 52% | ¥267/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 188ms | 137 KB | 44% | ¥260/mo | Costly |
dynamic.criteo.com dynamic.criteo.com | Other | 161ms | 25 KB | 89% | ¥223/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 159ms | 145 KB | 47% | ¥220/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 141ms | 145 KB | 48% | ¥195/mo | Costly |
cdn-edge.karte.io cdn-edge.karte.io | Other | 130ms | 17 KB | — | ¥180/mo | Costly |
bs.karte.io bs.karte.io | Other | 121ms | 77 KB | 42% | ¥167/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 113ms | 97 KB | 34% | ¥156/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 92ms | 125 KB | 51% | ¥127/mo | Costly |
cdn.d2-apps.net cdn.d2-apps.net | Other | 91ms | 3 KB | — | ¥126/mo | Costly |
Twitter/X Pixel static.ads-twitter.com | Advertising | 86ms | 13 KB | — | ¥119/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 79ms | 129 KB | 47% | ¥109/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 62ms | 17 KB | — | ¥85/mo | Costly |
cdn.id5-sync.com cdn.id5-sync.com | Other | 59ms | 35 KB | — | ¥81/mo | Costly |
Google Analytics www.google-analytics.com | Analytics | 52ms | 21 KB | — | ¥72/mo | Costly |
sslwidget.criteo.com sslwidget.criteo.com | Other | 51ms | 1 KB | — | ¥70/mo | Costly |
These scripts may cost more than they're worth
- www.so-net.ne.jp adds 2271ms and costs ~¥3138/month
- Unattributable adds 1593ms and costs ~¥2201/month
- assets.adobedtm.com adds 693ms and costs ~¥958/month
- www.so-net.ne.jp adds 530ms and costs ~¥732/month
- Google Tag Manager adds 435ms and costs ~¥601/month
- www.so-net.ne.jp adds 398ms and costs ~¥550/month
- bs.karte.io adds 284ms and costs ~¥393/month
- Google Tag Manager adds 268ms and costs ~¥371/month
- Facebook Pixel adds 258ms and costs ~¥356/month
- cdn-edge.karte.io adds 244ms and costs ~¥337/month
- analytics.tiktok.com adds 201ms and costs ~¥278/month
- Google Tag Manager adds 194ms and costs ~¥268/month
- ce.mf.marsflag.com adds 193ms and costs ~¥267/month
- Google Tag Manager adds 188ms and costs ~¥260/month
- dynamic.criteo.com adds 161ms and costs ~¥223/month
- Google Tag Manager adds 159ms and costs ~¥220/month
- Google Tag Manager adds 141ms and costs ~¥195/month
- cdn-edge.karte.io adds 130ms and costs ~¥180/month
- bs.karte.io adds 121ms and costs ~¥167/month
- Facebook Pixel adds 113ms and costs ~¥156/month
- Google Tag Manager adds 92ms and costs ~¥127/month
- cdn.d2-apps.net adds 91ms and costs ~¥126/month
- Twitter/X Pixel adds 86ms and costs ~¥119/month
- Google Tag Manager adds 79ms and costs ~¥109/month
- Facebook Pixel adds 62ms and costs ~¥85/month
- cdn.id5-sync.com adds 59ms and costs ~¥81/month
- Google Analytics adds 52ms and costs ~¥72/month
- sslwidget.criteo.com adds 51ms 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.so-net.ne.jp takes 2271ms 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 1593ms 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
assets.adobedtm.com takes 693ms 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.so-net.ne.jp takes 530ms 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 435ms 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.so-net.ne.jp takes 398ms 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
bs.karte.io 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
Google Tag Manager takes 268ms 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
Facebook Pixel takes 258ms 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-edge.karte.io takes 244ms 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
analytics.tiktok.com takes 201ms 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
54% of analytics.tiktok.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
Google Tag Manager takes 194ms 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
ce.mf.marsflag.com takes 193ms 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 ce.mf.marsflag.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
Google Tag Manager takes 188ms 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
dynamic.criteo.com takes 161ms 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
89% of dynamic.criteo.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
Google Tag Manager takes 159ms 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 141ms 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-edge.karte.io takes 130ms 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
bs.karte.io takes 121ms 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
Facebook Pixel takes 113ms 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 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
51% 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
cdn.d2-apps.net 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
Twitter/X Pixel takes 86ms 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 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
Facebook Pixel takes 62ms 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.id5-sync.com 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
Google Analytics takes 52ms 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
sslwidget.criteo.com 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