Performance
· 15 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.
706 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.98 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
97 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.
2.17 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.
3.38 s
Page Load Progression
375 ms
750 ms 1.1 s
1.5 s
1.9 s 2.2 s 2.6 s 3.0 sFPage Weight BudgetAction7.6 MB transferred, 267 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
DJS BundlesAction34 scripts, 215 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.justwatch.com/appassets/js/1776857142622_app.d118834e.js | 206 KB | 78 KB (38%) | ✓ | 3rd |
| https://www.justwatch.com/appassets/js/1776857142622_npm.sentry-internal.e50f9ed8.js | 52 KB | 43 KB (83%) | ✓ | 3rd |
| https://www.justwatch.com/appassets/js/1776857142622_npm.sentry.7ab7f5b8.js | 58 KB | 41 KB (70%) | ✓ | 3rd |
| https://web.cmp.usercentrics.eu/ui/v/3.117.0/WebSdk.lib.4c6726a9.js | 56 KB | 30 KB (54%) | ✓ | 3rd |
| https://www.justwatch.com/appassets/js/1776857142622_npm.firebase.05d26338.js | 41 KB | 23 KB (57%) | ✗ | 3rd |
| https://www.justwatch.com/appassets/js/1776857142622_chunk-2d0aa928.05a935dd.js | 1 KB | — | ✓ | 3rd |
| https://www.justwatch.com/appassets/js/1776857142622_chunk-2d0c9573.6d87e91b.js | 1 KB | — | ✓ | 3rd |
| https://www.justwatch.com/appassets/js/1776857142622_npm.fortawesome.26f14267.js | 25 KB | — | ✓ | 3rd |
| https://www.justwatch.com/appassets/js/1776857142622_european-banner-footer.6042eb7d.js | 2 KB | — | ✓ | 3rd |
| https://www.justwatch.com/appassets/js/1776857142622_npm.graphql.0fdb0149.js | 10 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
DPage Weight InventoryAction267 resources · 7.6 MB · 215 KB savings availableFIX
~214.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 267 resources | 7.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction205 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
CJS Execution CostAction1139ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 377ms | 52ms | 0ms | 3rd |
| https://www.justwatch.com/appassets/js/1776857142622_chunk-2d21061a.04852039.js | 329ms | 311ms | 0ms | 3rd |
| https://www.justwatch.com/ | 299ms | 13ms | 38ms | 3rd |
| https://www.justwatch.com/appassets/js/1776857142622_app.d118834e.js | 134ms | 107ms | 24ms | 3rd |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (112 KB)PASS
Web fonts
4
112 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 HintsNo optimization neededPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Google Cloud
Network Waterfall267 requests over 1838msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 377ms | 0 KB | — | $5/mo | Costly |
www.justwatch.com www.justwatch.com | Other | 329ms | 1 KB | — | $4/mo | Costly |
www.justwatch.com www.justwatch.com | Other | 299ms | 187 KB | — | $4/mo | Costly |
www.justwatch.com www.justwatch.com | Other | 134ms | 206 KB | 38% | $2/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 377ms and costs ~$5/month
- www.justwatch.com adds 329ms and costs ~$4/month
- www.justwatch.com adds 299ms 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
Unattributable takes 377ms 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.justwatch.com takes 329ms 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.justwatch.com takes 299ms 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