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.
6.87 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
13.75 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
7.39 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.191
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
17.88 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.
32.82 s
Page Load Progression
FPage Weight BudgetAction4.6 MB transferred, 282 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 CostAction55709ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://static.rakuten.com/assets/ac/_next/static/chunks/1468-fe0964eaede6b580.js | 16246ms | 7939ms | 16ms | 3rd |
| https://static.rakuten.com/assets/ac/_next/static/chunks/framework.da11f85a3fded98a.js | 7867ms | 7142ms | 13ms | 3rd |
| https://wsv3cdn.audioeye.com/static-scripts/m/audioeye-scanner-esm/v11.0.43/audioeye-scanner-esm.js | 5481ms | 5295ms | 1ms | 3rd |
| Unattributable | 3806ms | 418ms | 0ms | 3rd |
| https://www.redditstatic.com/ads/pixel.js | 3321ms | 3160ms | 18ms | 3rd |
| https://cdn.sprig.com/dependencies/record.min.js | 3265ms | 3113ms | 1ms | 3rd |
| https://www.rakuten.com/ | 2694ms | 5ms | 3ms | 3rd |
| https://static.rakuten.com/assets/ac/_next/static/chunks/3424-745a98fafda91817.js | 2469ms | 2010ms | 36ms | 3rd |
| https://scripts.clarity.ms/0.8.60-beta/clarity.js | 1278ms | 1241ms | 7ms | 3rd |
| https://cdn.sprig.com/shim.js?id=kgEKxiY_4yxQ | 1160ms | 927ms | 23ms | 3rd |
Showing top 10 of 43 scripts
FJS BundlesAction89 scripts, 1.1 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://static.rakuten.com/assets/ac/_next/static/chunks/pages/_app-3d08c9ea0cf0791c.js | 324 KB | 183 KB (57%) | ✓ | 3rd |
| https://static.rakuten.com/assets/ac/_next/static/chunks/3323.e2f0e0a4f02cb517.js | 241 KB | 166 KB (69%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 96 KB | 71 KB (75%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-EYM541FD0J&cx=c&_slc=1 | 164 KB | 71 KB (43%) | ✓ | 3rd |
| https://wsv3cdn.audioeye.com/static-scripts/v2/2026-04-08/startup.bundle.js | 0 KB | 64 KB (52%) | ✓ | 3rd |
| https://wsv3cdn.audioeye.com/static-scripts/v2/2026-04-08/startup.bundle.js | 124 KB | 64 KB (52%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-11382473&cx=c>m=4e64f0 | 129 KB | 62 KB (48%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NDCS3F | 177 KB | 60 KB (34%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-1TWBFMXGYQ&cx=c>m=4e64f0 | 174 KB | 58 KB (33%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/bundle/sdk.js/ | 78 KB | 50 KB (64%) | ✓ | 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 InventoryAction282 resources · 4.6 MB · 1.1 MB savings availableFIX
~1.1 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 282 resources | 4.6 MiB | ||||||
BImage Optimization56 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
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 Loading9 fonts (208 KB)PASS
Web fonts
9
208 KB total
Render-blocking
0
of 9
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 ~1 KB and ~2 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints10 hints, 0 missing preconnectsPASS
Current Resource Hints
10 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
AHTTP Cachingmax-age=86400 (1 day)PASS
max-age=86400
| Directive | Value | Meaning |
|---|---|---|
| max-age | 86400 | Cache for 1 day |
Network Waterfall282 requests over 41253msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
static.rakuten.com static.rakuten.com | Other | 16246ms | 38 KB | 55% | ¥241/mo | Costly |
static.rakuten.com static.rakuten.com | Other | 7867ms | 45 KB | — | ¥116/mo | Costly |
wsv3cdn.audioeye.com wsv3cdn.audioeye.com | Other | 5481ms | 0 KB | 45% | ¥81/mo | Costly |
Unattributable Unattributable | Other | 3806ms | 0 KB | — | ¥56/mo | Costly |
www.redditstatic.com www.redditstatic.com | Other | 3321ms | 19 KB | — | ¥49/mo | Costly |
cdn.sprig.com cdn.sprig.com | Other | 3265ms | 57 KB | 66% | ¥48/mo | Costly |
www.rakuten.com www.rakuten.com | Other | 2694ms | 120 KB | — | ¥40/mo | Costly |
static.rakuten.com static.rakuten.com | Other | 2469ms | 39 KB | 99% | ¥37/mo | Costly |
Microsoft Clarity scripts.clarity.ms | Session Replay | 1278ms | 25 KB | — | ¥19/mo | Costly |
cdn.sprig.com cdn.sprig.com | Other | 1160ms | 29 KB | — | ¥17/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 972ms | 177 KB | 34% | ¥14/mo | Costly |
www.datadoghq-browser-agent.com www.datadoghq-browser-agent.com | Other | 886ms | 13 KB | — | ¥13/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 727ms | 174 KB | 33% | ¥11/mo | Costly |
wsv3cdn.audioeye.com wsv3cdn.audioeye.com | Other | 717ms | 0 KB | 52% | ¥11/mo | Costly |
static.rakuten.com static.rakuten.com | Other | 714ms | 241 KB | 69% | ¥11/mo | Costly |
static.rakuten.com static.rakuten.com | Other | 502ms | 324 KB | 57% | ¥7/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 334ms | 164 KB | 43% | ¥5/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 286ms | 46 KB | — | ¥4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 258ms | 129 KB | 48% | ¥4/mo | Costly |
static.rakuten.com static.rakuten.com | Other | 227ms | 42 KB | 56% | ¥3/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 218ms | 96 KB | 33% | ¥3/mo | Costly |
wsv3cdn.audioeye.com wsv3cdn.audioeye.com | Other | 203ms | 0 KB | — | ¥3/mo | Costly |
wsv3cdn.audioeye.com wsv3cdn.audioeye.com | Other | 186ms | 0 KB | — | ¥3/mo | Optional |
static.rakuten.com static.rakuten.com | Other | 172ms | 3 KB | — | ¥3/mo | Optional |
Google Ads Conversion www.googleadservices.com | Advertising | 160ms | 24 KB | — | ¥2/mo | Optional |
static.rakuten.com static.rakuten.com | Other | 142ms | 35 KB | — | ¥2/mo | Optional |
s.pinimg.com s.pinimg.com | Other | 137ms | 28 KB | — | ¥2/mo | Optional |
static.rakuten.com static.rakuten.com | Other | 119ms | 1 KB | — | ¥2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 115ms | 78 KB | 64% | ¥2/mo | Optional |
intl.rakuten-static.com intl.rakuten-static.com | Other | 111ms | 12 KB | — | ¥2/mo | Optional |
wsv3cdn.audioeye.com wsv3cdn.audioeye.com | Other | 103ms | 0 KB | — | ¥2/mo | Optional |
js.rmtag.com js.rmtag.com | Other | 103ms | 14 KB | — | ¥2/mo | Optional |
login-ds.dotomi.com login-ds.dotomi.com | Other | 81ms | 14 KB | — | ¥1/mo | Optional |
wsv3cdn.audioeye.com wsv3cdn.audioeye.com | Other | 79ms | 0 KB | — | ¥1/mo | Optional |
static.rakuten.com static.rakuten.com | Other | 77ms | 24 KB | — | ¥1/mo | Optional |
Google Analytics www.google-analytics.com | Analytics | 72ms | 21 KB | — | ¥1/mo | Optional |
static.rakuten.com static.rakuten.com | Other | 65ms | 36 KB | — | ¥1/mo | Optional |
accounts.google.com accounts.google.com | Other | 65ms | 96 KB | 75% | ¥1/mo | Optional |
wsv3cdn.audioeye.com wsv3cdn.audioeye.com | Other | 63ms | 0 KB | — | ¥1/mo | Optional |
Twitter/X Pixel static.ads-twitter.com | Advertising | 60ms | 13 KB | — | ¥1/mo | Optional |
static.rakuten.com static.rakuten.com | Other | 57ms | 23 KB | — | ¥1/mo | Optional |
app.link app.link | Other | 55ms | 1 KB | — | ¥1/mo | Optional |
cdn.sprig.com cdn.sprig.com | Other | 54ms | 45 KB | — | ¥1/mo | Optional |
These scripts may cost more than they're worth
- static.rakuten.com adds 16246ms and costs ~¥241/month
- static.rakuten.com adds 7867ms and costs ~¥116/month
- wsv3cdn.audioeye.com adds 5481ms and costs ~¥81/month
- Unattributable adds 3806ms and costs ~¥56/month
- www.redditstatic.com adds 3321ms and costs ~¥49/month
- cdn.sprig.com adds 3265ms and costs ~¥48/month
- www.rakuten.com adds 2694ms and costs ~¥40/month
- static.rakuten.com adds 2469ms and costs ~¥37/month
- Microsoft Clarity adds 1278ms and costs ~¥19/month
- cdn.sprig.com adds 1160ms and costs ~¥17/month
- Google Tag Manager adds 972ms and costs ~¥14/month
- www.datadoghq-browser-agent.com adds 886ms and costs ~¥13/month
- Google Tag Manager adds 727ms and costs ~¥11/month
- wsv3cdn.audioeye.com adds 717ms and costs ~¥11/month
- static.rakuten.com adds 714ms and costs ~¥11/month
- static.rakuten.com adds 502ms and costs ~¥7/month
- Google Tag Manager adds 334ms and costs ~¥5/month
- Facebook Pixel adds 286ms and costs ~¥4/month
- Google Tag Manager adds 258ms and costs ~¥4/month
- static.rakuten.com adds 227ms and costs ~¥3/month
- Facebook Pixel adds 218ms and costs ~¥3/month
- wsv3cdn.audioeye.com adds 203ms and costs ~¥3/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
static.rakuten.com takes 16246ms 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
55% of static.rakuten.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
static.rakuten.com takes 7867ms 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
wsv3cdn.audioeye.com takes 5481ms 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 3806ms 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.redditstatic.com takes 3321ms 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.sprig.com takes 3265ms 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
66% of cdn.sprig.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
www.rakuten.com takes 2694ms 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
static.rakuten.com takes 2469ms 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
99% of static.rakuten.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
Microsoft Clarity takes 1278ms 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.sprig.com takes 1160ms 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 972ms 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.datadoghq-browser-agent.com takes 886ms 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 727ms 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
wsv3cdn.audioeye.com takes 717ms 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 wsv3cdn.audioeye.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
static.rakuten.com takes 714ms 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
69% of static.rakuten.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
static.rakuten.com takes 502ms 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
57% of static.rakuten.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 334ms 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 286ms 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 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
static.rakuten.com takes 227ms 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 static.rakuten.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
Facebook Pixel 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
wsv3cdn.audioeye.com takes 203ms 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
64% of Facebook Pixel'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
75% of accounts.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