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.
3.84 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
7.71 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
176 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.964
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.84 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.
10.67 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction5284ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.welt.de/ | 2744ms | 88ms | 16ms | 3rd |
| https://www.welt.de/assets/bff-section/scripts/section.module.BkCq1DgY.js | 878ms | 493ms | 2ms | 3rd |
| Unattributable | 596ms | 34ms | 0ms | 3rd |
| https://www.asadcdn.com/adlib/pages/welt.js?1 | 256ms | 160ms | 8ms | 3rd |
| https://ast.welt.de/welt/prod/utag.js | 231ms | 201ms | 18ms | 3rd |
| https://rosetta.prod.ps.welt.de/ps-rosetta.js | 227ms | 205ms | 4ms | 3rd |
| https://consent.up.welt.de/unified/wrapperMessagingWithoutDetection.js | 171ms | 137ms | 10ms | 3rd |
| https://ast.welt.de/welt/prod/utag.155.js?utv=ut4.46.202604091316 | 128ms | 112ms | 10ms | 3rd |
| https://consent.up.welt.de/unified/4.40.1/gdpr-tcf.27718c8cb9d29947d2c1.bundle.js | 53ms | 37ms | 16ms | 3rd |
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BPage Weight Budget1.3 MB transferred, 100 requestsREVIEW
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
BImage Optimization12 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
Set explicit width and height to prevent CLS.
Performance issues directly impact user engagement and conversion rates.
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
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 Bundles59 scripts, 101 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.welt.de/assets/bff-section/scripts/section.module.BkCq1DgY.js | 115 KB | 50 KB (44%) | ✓ | 3rd |
| https://jnt.welt.de/get/live/web/_/6pzfc2.js | 36 KB | 29 KB (82%) | ✓ | 3rd |
| https://ast.welt.de/welt/prod/utag.js | 60 KB | 22 KB (37%) | ✓ | 3rd |
| https://consent.up.welt.de/unified/wrapperMessagingWithoutDetection.js | 42 KB | — | ✓ | 3rd |
| https://www.asadcdn.com/adlib/pages/welt.js?1 | 29 KB | — | ✓ | 3rd |
| https://rosetta.prod.ps.welt.de/ps-rosetta.js | 16 KB | — | ✓ | 3rd |
| https://www.asadcdn.com/pec/currency.js | 2 KB | — | ✓ | 3rd |
| https://www.asadcdn.com/adlib/libmodules/mew/init.c73e2ca3.js | 1 KB | — | ✓ | 3rd |
| https://www.asadcdn.com/adlib/libmodules/mew/sendEvent.5e638723.js | 0 KB | — | ✓ | 3rd |
| https://www.asadcdn.com/adlib/libmodules/mew/addCSS.52213e56.js | 0 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
CPage Weight InventoryAction100 resources · 1.3 MB · 101 KB savings availableREVIEW
~101.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 100 resources | 1.3 MiB | ||||||
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 (92 KB)PASS
Web fonts
4
92 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 Hints6 hints, 0 missing preconnectsPASS
Current Resource Hints
6 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall100 requests over 2707msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.welt.de www.welt.de | Other | 2744ms | 169 KB | — | €13/mo | Costly |
www.welt.de www.welt.de | Other | 878ms | 115 KB | 44% | €4/mo | Costly |
Unattributable Unattributable | Other | 596ms | 0 KB | — | €3/mo | Costly |
www.asadcdn.com www.asadcdn.com | Other | 256ms | 29 KB | — | €1/mo | Costly |
ast.welt.de ast.welt.de | Other | 231ms | 60 KB | 37% | €1/mo | Costly |
rosetta.prod.ps.welt.de rosetta.prod.ps.welt.de | Other | 227ms | 16 KB | — | €1/mo | Costly |
consent.up.welt.de consent.up.welt.de | Other | 171ms | 42 KB | — | €1/mo | Optional |
ast.welt.de ast.welt.de | Other | 128ms | 29 KB | — | €1/mo | Optional |
consent.up.welt.de consent.up.welt.de | Other | 53ms | 24 KB | — | €0/mo | Optional |
These scripts may cost more than they're worth
- www.welt.de adds 2744ms and costs ~€13/month
- www.welt.de adds 878ms and costs ~€4/month
- Unattributable adds 596ms and costs ~€3/month
- www.asadcdn.com adds 256ms and costs ~€1/month
- ast.welt.de adds 231ms and costs ~€1/month
- rosetta.prod.ps.welt.de adds 227ms and costs ~€1/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.welt.de takes 2744ms 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.welt.de takes 878ms 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 596ms 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.asadcdn.com takes 256ms 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
ast.welt.de takes 231ms 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
rosetta.prod.ps.welt.de takes 227ms 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