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.
1.97 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
5.26 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 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.
4.80 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.
5.27 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.
BJS Execution Cost521ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.hu-berlin.de/ | 253ms | 15ms | 3ms | 3rd |
| Unattributable | 197ms | 11ms | 0ms | 3rd |
| https://www.hu-berlin.de/typo3temp/assets/compressed/merged-de569302615261e7e75ace4e072e3cca-609549ee28eff9a5403fc0f698826cfc.js.gz?1775722608 | 71ms | 33ms | 13ms | 3rd |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
APage Weight Budget850 KB transferred, 30 requestsPASS
A+Text CompressionAll text resources are compressedPASS
AImage Optimization8 images, 0 KB saveablePASS
A+Font Loading6 fonts (118 KB)PASS
Web fonts
6
118 KB total
Render-blocking
0
of 6
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 Bundles3 scripts, 25 KB unusedPASS
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.hu-berlin.de/typo3temp/assets/compressed/merged-de569302615261e7e75ace4e072e3cca-609549ee28eff9a5403fc0f698826cfc.js.gz?1775722608 | 31 KB | 25 KB (80%) | ✓ | 3rd |
| https://www.hu-berlin.de/_assets/3434b65bcd82b8523edd2faff33a8c0c/Build/JavaScript/header-search.js?1775722496 | 8 KB | — | ✓ | 3rd |
| https://www3.hu-berlin.de/piwik/js/container_1Va9x6Kt.js | 33 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 Hints3 hints, 0 missing preconnectsPASS
Current Resource Hints
3 resource hints configured
APage Weight Inventory30 resources · 850 KB · 25 KB savings availablePASS
~25.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 30 resources | 850.0 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall30 requests over 1645msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.hu-berlin.de www.hu-berlin.de | Other | 253ms | 22 KB | — | €3/mo | Costly |
Unattributable Unattributable | Other | 197ms | 0 KB | — | €2/mo | Optional |
www.hu-berlin.de www.hu-berlin.de | Other | 71ms | 31 KB | 80% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.hu-berlin.de adds 253ms and costs ~€3/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.hu-berlin.de takes 253ms 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
80% of www.hu-berlin.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