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.
1.28 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.71 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
37 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.
1.40 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.
1.71 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 sDThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BPage Weight Budget1.0 MB transferred, 56 requestsREVIEW
BImage Optimization11 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 CostAction1065ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.bpb.de/sites/default/files/js/js_dK60XH05EgZeeV86BHWie9c_QkiB_X-RkN2cqHjQhEM.js | 895ms | 486ms | 31ms | 3rd |
| https://www.bpb.de/ | 111ms | 1ms | 1ms | 3rd |
| Unattributable | 59ms | 1ms | 0ms | 3rd |
CJS BundlesAction34 scripts, 223 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.bpb.de/sites/default/files/js/js_dK60XH05EgZeeV86BHWie9c_QkiB_X-RkN2cqHjQhEM.js | 362 KB | 223 KB (62%) | ✓ | 3rd |
| https://www.bpb.de/themes/custom/bpbtheme/assets/js/5152.d2bc131c5434b589ea2b.js | 1 KB | — | ✓ | 3rd |
| https://www.bpb.de/themes/custom/bpbtheme/assets/js/111.8610825ddabe5a1fd657.js | 1 KB | — | ✓ | 3rd |
| https://www.bpb.de/themes/custom/bpbtheme/assets/js/5699.b14c8d9e5cf114836046.js | 1 KB | — | ✓ | 3rd |
| https://www.bpb.de/themes/custom/bpbtheme/assets/js/4441.b5d7c383ff0c1da8e793.js | 1 KB | — | ✓ | 3rd |
| https://www.bpb.de/themes/custom/bpbtheme/assets/js/2161.2e35aa4dc46abec1931b.js | 1 KB | — | ✓ | 3rd |
| https://www.bpb.de/themes/custom/bpbtheme/assets/js/5837.bc045cdbddd43d194e5b.js | 1 KB | — | ✓ | 3rd |
| https://www.bpb.de/themes/custom/bpbtheme/assets/js/1954.37773c7c7645891f91ce.js | 1 KB | — | ✓ | 3rd |
| https://www.bpb.de/themes/custom/bpbtheme/assets/js/129.2533cf01e4e8d78ff238.js | 10 KB | — | ✓ | 3rd |
| https://www.bpb.de/themes/custom/bpbtheme/assets/js/2817.975bdf87031920e7f3fa.js | 4 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
BPage Weight Inventory56 resources · 1.0 MB · 223 KB savings availableREVIEW
~222.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 56 resources | 1.0 MiB | ||||||
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (107 KB)PASS
Web fonts
5
107 KB total
Render-blocking
0
of 5
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: noris network AG
Network Waterfall56 requests over 1856msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.bpb.de www.bpb.de | Other | 895ms | 362 KB | 62% | €2/mo | Costly |
www.bpb.de www.bpb.de | Other | 111ms | 48 KB | — | €0/mo | Optional |
Unattributable Unattributable | Other | 59ms | 0 KB | — | €0/mo | Optional |
These scripts may cost more than they're worth
- www.bpb.de adds 895ms and costs ~€2/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.bpb.de takes 895ms 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 www.bpb.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