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.
732 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.30 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
251 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.274
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.26 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.
2.74 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 sDPage Weight BudgetAction2.2 MB transferred, 32 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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction4 scripts, 582 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.bundesregierung.de/resource/themes/relaunch/js/relaunch-1562518-106.js | 580 KB | 419 KB (73%) | ✓ | 3rd |
| https://dashboard.stage.bio/static/bundle.js | 159 KB | 99 KB (62%) | ✓ | 3rd |
| https://analytics.bundesregierung.de/piwik.js | 103 KB | 64 KB (63%) | ✓ | 3rd |
| https://www.bundesregierung.de/resource/themes/relaunch/js/commons-2243502-6.js | 34 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
FPage Weight InventoryAction32 resources · 2.2 MB · 582 KB savings availableFIX
~581.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 32 resources | 2.2 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization19 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
CJS Execution CostAction1545ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.bundesregierung.de/resource/themes/relaunch/js/relaunch-1562518-106.js | 726ms | 428ms | 92ms | 3rd |
| https://www.bundesregierung.de/breg-de | 577ms | 16ms | 4ms | 3rd |
| Unattributable | 88ms | 3ms | 0ms | 3rd |
| https://dashboard.stage.bio/static/bundle.js | 83ms | 53ms | 25ms | 3rd |
| https://www.bundesregierung.de/resource/themes/relaunch/css/relaunch-1562520-111.css | 71ms | 0ms | 0ms | 3rd |
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 Loading3 fonts (120 KB)PASS
Web fonts
3
120 KB total
Render-blocking
0
of 3
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
Network Waterfall32 requests over 1434msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.bundesregierung.de www.bundesregierung.de | Other | 726ms | 580 KB | 73% | €8/mo | Costly |
www.bundesregierung.de www.bundesregierung.de | Other | 577ms | 24 KB | — | €6/mo | Costly |
Unattributable Unattributable | Other | 88ms | 0 KB | — | €1/mo | Optional |
dashboard.stage.bio dashboard.stage.bio | Other | 83ms | 159 KB | 62% | €1/mo | Optional |
www.bundesregierung.de www.bundesregierung.de | Other | 71ms | 236 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.bundesregierung.de adds 726ms and costs ~€8/month
- www.bundesregierung.de adds 577ms and costs ~€6/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.bundesregierung.de takes 726ms 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
73% of www.bundesregierung.de'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.bundesregierung.de takes 577ms 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
62% of dashboard.stage.bio'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