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.
756 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.28 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
247 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.321
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.50 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.
2.50 s
Page Load Progression
DPage Weight BudgetAction2.5 MB transferred, 98 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction3576ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.bundestag.de/ | 1393ms | 8ms | 3ms | 3rd |
| https://www.bundestag.de/resource/themes/bundestag/js/jquery.min-826978-30.js | 1089ms | 452ms | 3ms | 3rd |
| https://www.bundestag.de/resource/themes/bundestag/js/vue-859624-56.js | 453ms | 252ms | 39ms | 3rd |
| Unattributable | 169ms | 5ms | 0ms | 3rd |
| https://webtv.bundestag.de/statics/tplayer/latest/production/lib/tv1hlsplayer.js | 166ms | 114ms | 50ms | 3rd |
| https://www.bundestag.de/resource/themes/bundestag/js/libs_wojq-596282-119.js | 135ms | 54ms | 34ms | 3rd |
| https://www.bundestag.de/resource/themes/bundestag/js/scripts-596300-130.js | 112ms | 45ms | 3ms | 3rd |
| https://www.bundestag.de/resource/themes/bundestag/js/bt.ts-1031834-16.js | 58ms | 46ms | 12ms | 3rd |
FJS BundlesAction29 scripts, 615 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://webtv.bundestag.de/statics/tplayer/latest/production/lib/tv1hlsplayer.js | 363 KB | 209 KB (58%) | ✓ | 3rd |
| https://www.bundestag.de/resource/themes/bundestag/js/libs_wojq-596282-119.js | 263 KB | 207 KB (79%) | ✓ | 3rd |
| https://www.bundestag.de/resource/themes/bundestag/js/vue-859624-56.js | 199 KB | 86 KB (44%) | ✓ | 3rd |
| https://www.bundestag.de/resource/themes/bundestag/js/bt.ts-1031834-16.js | 89 KB | 76 KB (86%) | ✓ | 3rd |
| https://statistik.bundestag.de/matomo.js | 67 KB | 37 KB (55%) | ✓ | 3rd |
| https://www.bundestag.de/resource/themes/bundestag/js/Transformator-596314-69.js | 6 KB | — | ✓ | 3rd |
| https://www.bundestag.de/resource/themes/bundestag/js/Suche-596306-62.js | 2 KB | — | ✓ | 3rd |
| https://www.bundestag.de/resource/themes/bundestag/js/Modules-596288-113.js | 22 KB | — | ✓ | 3rd |
| https://www.bundestag.de/resource/themes/bundestag/js/Countdown-850232-25.js | 2 KB | — | ✓ | 3rd |
| https://www.bundestag.de/resource/themes/bundestag/js/DataLoader-596260-64.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
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 InventoryAction98 resources · 2.5 MB · 615 KB savings availableFIX
~615.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 98 resources | 2.5 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization46 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 Loading7 fonts (554 KB)PASS
Web fonts
7
554 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~227 KB and ~454 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall98 requests over 3032msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.bundestag.de www.bundestag.de | Other | 1393ms | 41 KB | — | €15/mo | Costly |
www.bundestag.de www.bundestag.de | Other | 1089ms | 31 KB | — | €12/mo | Costly |
www.bundestag.de www.bundestag.de | Other | 453ms | 199 KB | 44% | €5/mo | Costly |
Unattributable Unattributable | Other | 169ms | 0 KB | — | €2/mo | Optional |
webtv.bundestag.de webtv.bundestag.de | Other | 166ms | 363 KB | 58% | €2/mo | Optional |
www.bundestag.de www.bundestag.de | Other | 135ms | 263 KB | 79% | €1/mo | Optional |
www.bundestag.de www.bundestag.de | Other | 112ms | 21 KB | — | €1/mo | Optional |
www.bundestag.de www.bundestag.de | Other | 58ms | 89 KB | 86% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.bundestag.de adds 1393ms and costs ~€15/month
- www.bundestag.de adds 1089ms and costs ~€12/month
- www.bundestag.de adds 453ms and costs ~€5/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.bundestag.de takes 1393ms 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.bundestag.de takes 1089ms 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.bundestag.de takes 453ms 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
58% of webtv.bundestag.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
79% of www.bundestag.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
86% of www.bundestag.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