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.
11.16 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
38.47 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
448 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.725
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
11.16 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.
39.06 s
Page Load Progression
550 ms
1.1 s
1.6 s
2.2 s
2.7 s 3.3 s 3.8 s
4.4 sFPage Weight BudgetAction9.9 MB transferred, 97 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
FJS Execution CostAction4744ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.nintendo.com/es-es/ | 2262ms | 175ms | 2ms | 3rd |
| Unattributable | 1687ms | 829ms | 0ms | 3rd |
| https://alps.cdn.nintendo.net/v1/js/account_es_EUR.js | 394ms | 325ms | 14ms | 3rd |
| https://cdn.accounts.nintendo.com/jssdk/nintendo-jssdk-client.3.0.2.js | 296ms | 271ms | 18ms | 3rd |
| https://www.nintendo.com/eu/app_static/assets/jE0zBmnv.js | 104ms | 70ms | 4ms | 3rd |
DPage Weight InventoryAction97 resources · 9.9 MB · 51 KB savings availableFIX
~50.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 97 resources | 9.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction21 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
BJS Bundles51 scripts, 51 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.nintendo.com/eu/app_static/assets/CqnbhlbB.js | 123 KB | 51 KB (41%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/otSDKStub.js | 0 KB | — | ✓ | 3rd |
| https://alps.cdn.nintendo.net/v1/js/account_es_EUR.js | 37 KB | — | ✓ | 3rd |
| https://www.nintendo.com/eu/app_static/assets/CPWWdYs0.js | 5 KB | — | ✓ | 3rd |
| https://www.nintendo.com/eu/app_static/assets/DIMaRtX9.js | 1 KB | — | ✓ | 3rd |
| https://www.nintendo.com/eu/app_static/assets/BCqGhHQZ.js | 11 KB | — | ✓ | 3rd |
| https://www.nintendo.com/eu/app_static/assets/BLhGjMxX.js | 2 KB | — | ✓ | 3rd |
| https://www.nintendo.com/eu/app_static/assets/jE0zBmnv.js | 647 KB | — | ✓ | 3rd |
| https://www.nintendo.com/eu/app_static/assets/CobVX0U6.js | 2 KB | — | ✓ | 3rd |
| https://www.nintendo.com/eu/app_static/assets/CelaCMx_.js | 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
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 Loading4 fonts (124 KB)PASS
Web fonts
4
124 KB total
Render-blocking
0
of 4
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 Hints3 hints, 0 missing preconnectsPASS
Current Resource Hints
3 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall97 requests over 2125msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.nintendo.com www.nintendo.com | Other | 2262ms | 824 KB | — | $30/mo | Costly |
Unattributable Unattributable | Other | 1687ms | 0 KB | — | $22/mo | Costly |
alps.cdn.nintendo.net alps.cdn.nintendo.net | Other | 394ms | 37 KB | — | $5/mo | Costly |
cdn.accounts.nintendo.com cdn.accounts.nintendo.com | Other | 296ms | 28 KB | — | $4/mo | Costly |
www.nintendo.com www.nintendo.com | Other | 104ms | 647 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.nintendo.com adds 2262ms and costs ~$30/month
- Unattributable adds 1687ms and costs ~$22/month
- alps.cdn.nintendo.net adds 394ms and costs ~$5/month
- cdn.accounts.nintendo.com adds 296ms and costs ~$4/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.nintendo.com takes 2262ms 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 1687ms 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
alps.cdn.nintendo.net takes 394ms 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.accounts.nintendo.com takes 296ms 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