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.
666 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.43 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
4 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.003
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.72 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.
2.63 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 sFPage Weight BudgetAction3.8 MB transferred, 51 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction15 scripts, 772 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.fraunhofer.de/static/js/thirdparty/node_modules/resources/videojs/core/alt/video.novtt.min.js | 630 KB | 556 KB (89%) | ✓ | 3rd |
| https://www.fraunhofer.de/etc.clientlibs/fraunhofer/ui/website/js/fraunhofer.min.js | 227 KB | 183 KB (81%) | ✗ | 3rd |
| https://www.fraunhofer.de/static/js/thirdparty/bower_components/resources/25.1.1.0/jquery/dist/jquery.min.js | 88 KB | 34 KB (39%) | ✓ | 3rd |
| https://www.fraunhofer.de/static/js/thirdparty/bower_components/resources/25.1.1.0/jquery-bridget/jquery.bridget.min.js | 2 KB | — | ✓ | 3rd |
| https://www.fraunhofer.de/static/js/thirdparty/bower_components/resources/25.1.1.0/jquery-placeholder/jquery.placeholder.min.js | 3 KB | — | ✓ | 3rd |
| https://www.fraunhofer.de/static/js/thirdparty/bower_components/resources/25.1.1.0/masonry/dist/masonry.pkgd.min.js | 24 KB | — | ✓ | 3rd |
| https://www.fraunhofer.de/etc.clientlibs/fraunhofer/ui/website/js/thirdparty/requirejs.min.js | 15 KB | — | ✓ | 3rd |
| https://www.fraunhofer.de/static/js/thirdparty/validatejs.min.js | 8 KB | — | ✓ | 3rd |
| https://www.fraunhofer.de/static/js/thirdparty/bower_components/resources/25.1.1.0/picturefill/dist/picturefill.min.js | 8 KB | — | ✓ | 3rd |
| https://www.fraunhofer.de/static/js/thirdparty/bower_components/resources/25.1.1.0/jQuery.dotdotdot/src/jquery.dotdotdot.min.js | 7 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
FPage Weight InventoryAction51 resources · 3.8 MB · 772 KB savings availableFIX
~772.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 51 resources | 3.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization27 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
BJS Execution Cost514ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.fraunhofer.de/etc.clientlibs/fraunhofer/ui/website/js/thirdparty/requirejs.min.js | 293ms | 176ms | 1ms | 3rd |
| https://www.fraunhofer.de/ | 152ms | 2ms | 0ms | 3rd |
| Unattributable | 69ms | 1ms | 0ms | 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 Loading3 fonts (115 KB)PASS
Web fonts
3
115 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
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 ~3 KB and ~6 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall51 requests over 893msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.fraunhofer.de www.fraunhofer.de | Other | 293ms | 15 KB | — | €3/mo | Costly |
www.fraunhofer.de www.fraunhofer.de | Other | 152ms | 19 KB | — | €2/mo | Optional |
Unattributable Unattributable | Other | 69ms | 0 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.fraunhofer.de adds 293ms 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.fraunhofer.de takes 293ms 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