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.
2.61 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.65 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
33 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.
3.27 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.
3.69 s
Page Load Progression
452 ms 904 ms
1.4 s
1.8 s 2.3 s
2.7 s 3.2 s
3.6 sFPage Weight BudgetAction13.6 MB transferred, 44 requestsFIX
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction44 resources · 13.6 MB · 21 KB savings availableFIX
~20.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 44 resources | 13.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction24 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.
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
CJS Execution CostAction1541ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 745ms | 11ms | 0ms | 3rd |
| https://www.denic.de/ | 513ms | 7ms | 1ms | 3rd |
| https://www.denic.de/_assets/d0d26efed57d317ec4497ad160eb1a56/Vite/assets/@tailwindplus-b_xrnD8n.js | 124ms | 115ms | 0ms | 3rd |
| https://www.denic.de/_assets/d0d26efed57d317ec4497ad160eb1a56/Vite/assets/app-DJNQvi-L.js | 82ms | 6ms | 0ms | 3rd |
| https://www.denic.de/fileadmin/_static/assets/cookie-optin/siteroot-1/cookieOptin.js?1764788132 | 77ms | 18ms | 8ms | 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 Loading7 fonts (86 KB)PASS
Web fonts
7
86 KB total
Render-blocking
0
of 7
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+JS Bundles5 scripts, 21 KB unusedPASS
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.denic.de/_assets/d0d26efed57d317ec4497ad160eb1a56/Vite/assets/@tailwindplus-b_xrnD8n.js | 24 KB | 21 KB (87%) | ✓ | 3rd |
| https://www.denic.de/_assets/d0d26efed57d317ec4497ad160eb1a56/Vite/assets/app-DJNQvi-L.js | 9 KB | — | ✓ | 3rd |
| https://www.denic.de/fileadmin/_static/assets/cookie-optin/siteroot-1/cookieOptin.js?1764788132 | 14 KB | — | ✓ | 3rd |
| https://www.denic.de/_assets/d0d26efed57d317ec4497ad160eb1a56/Vite/assets/alpinejs-BkKOMYu4.js | 16 KB | — | ✓ | 3rd |
| https://www.denic.de/_assets/d0d26efed57d317ec4497ad160eb1a56/Vite/assets/@alpinejs-DUd3sQ38.js | 1 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
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall44 requests over 884msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 745ms | 0 KB | — | €8/mo | Costly |
www.denic.de www.denic.de | Other | 513ms | 43 KB | — | €6/mo | Costly |
www.denic.de www.denic.de | Other | 124ms | 24 KB | 87% | €1/mo | Optional |
www.denic.de www.denic.de | Other | 82ms | 9 KB | — | €1/mo | Optional |
www.denic.de www.denic.de | Other | 77ms | 14 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 745ms and costs ~€8/month
- www.denic.de adds 513ms 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
Unattributable takes 745ms 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.denic.de takes 513ms 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
87% of www.denic.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