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.
5.25 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
11.88 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.66 s
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.
6.17 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.
13.13 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction10645ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://privacy-proxy.usercentrics.eu/latest/uc-block.bundle.js | 2496ms | 2096ms | 18ms | 3rd |
| https://www.goethe.de/i97lSv/o/J/D4ixQlngzmt-/bpi1XSV3/Hj9UbhhbAQ/Sk5gchJ0/djAPAg?v=5e0fd135-6266-02e0-0554-e67caa7e0210 | 2145ms | 1951ms | 78ms | 3rd |
| Unattributable | 1666ms | 432ms | 0ms | 3rd |
| https://app.usercentrics.eu/browser-ui/3.98.1/index.module.js | 870ms | 570ms | 3ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-W3QG49 | 815ms | 667ms | 111ms | 3rd |
| https://www.goethe.de/de/index.html | 698ms | 311ms | 17ms | 3rd |
| https://www.goethe.de/resources/js/jquery-3.6.3.min.js | 433ms | 203ms | 15ms | 3rd |
| https://www.goethe.de/resources/js/goethe.support.gimin.js | 374ms | 222ms | 5ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-1045675900&cx=c>m=4e64h1 | 366ms | 288ms | 74ms | 3rd |
| https://www.goethe.de/resources/relaunch/js/combobox-autocomplete.gimin.js | 207ms | 128ms | 3ms | 3rd |
Showing top 10 of 15 scripts
DJS BundlesAction34 scripts, 302 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-W3QG49 | 175 KB | 69 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-1045675900&cx=c>m=4e64h1 | 137 KB | 64 KB (47%) | ✓ | 3rd |
| https://app.usercentrics.eu/browser-ui/3.98.1/index.module.js | 121 KB | 54 KB (44%) | ✓ | 3rd |
| https://www.goethe.de/i97lSv/o/J/D4ixQlngzmt-/bpi1XSV3/Hj9UbhhbAQ/Sk5gchJ0/djAPAg?v=5e0fd135-6266-02e0-0554-e67caa7e0210 | 0 KB | 31 KB (20%) | ✓ | 3rd |
| https://www.goethe.de/i97lSv/o/J/D4ixQlngzmt-/bpi1XSV3/Hj9UbhhbAQ/Sk5gchJ0/djAPAg?v=5e0fd135-6266-02e0-0554-e67caa7e0210 | 150 KB | 31 KB (20%) | ✓ | 3rd |
| https://www.goethe.de/resources/relaunch/js/swiper/swiper-bundle.min.js | 42 KB | 27 KB (65%) | ✓ | 3rd |
| https://app.usercentrics.eu/browser-ui/3.98.1/VirtualServiceItem-b82c2a99.js | 49 KB | 26 KB (54%) | ✓ | 3rd |
| https://app.usercentrics.eu/browser-ui/3.98.1/DefaultData-c6c622cd-09bb7067.js | 1 KB | — | ✓ | 3rd |
| https://app.usercentrics.eu/browser-ui/3.98.1/ButtonsCustomization-6135b8b0-75588c21.js | 0 KB | — | ✓ | 3rd |
| https://www.goethe.de/resources/relaunch/js/responsive-header-v3.gimin.js | 3 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
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
DPage Weight InventoryAction89 resources · 1.4 MB · 302 KB savings availableFIX
~301.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 89 resources | 1.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BPage Weight Budget1.4 MB transferred, 89 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
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
BImage Optimization21 images, 0 KB saveableREVIEW
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 (214 KB)PASS
Web fonts
4
214 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 Waterfall89 requests over 5039msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
privacy-proxy.usercentrics.eu privacy-proxy.usercentrics.eu | Other | 2496ms | 30 KB | — | €27/mo | Costly |
www.goethe.de www.goethe.de | Other | 2145ms | 0 KB | 20% | €23/mo | Costly |
Unattributable Unattributable | Other | 1666ms | 0 KB | — | €18/mo | Costly |
app.usercentrics.eu app.usercentrics.eu | Other | 870ms | 121 KB | 44% | €9/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 815ms | 175 KB | 40% | €9/mo | Costly |
www.goethe.de www.goethe.de | Other | 698ms | 43 KB | — | €8/mo | Costly |
www.goethe.de www.goethe.de | Other | 433ms | 31 KB | — | €5/mo | Costly |
www.goethe.de www.goethe.de | Other | 374ms | 9 KB | — | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 366ms | 137 KB | 47% | €4/mo | Costly |
www.goethe.de www.goethe.de | Other | 207ms | 3 KB | — | €2/mo | Costly |
www.goethe.de www.goethe.de | Other | 186ms | 1 KB | — | €2/mo | Optional |
app.usercentrics.eu app.usercentrics.eu | Other | 109ms | 11 KB | — | €1/mo | Optional |
www.goethe.de www.goethe.de | Other | 98ms | 42 KB | 65% | €1/mo | Optional |
www.goethe.de www.goethe.de | Other | 97ms | 9 KB | — | €1/mo | Optional |
www.goethe.de www.goethe.de | Other | 85ms | 3 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- privacy-proxy.usercentrics.eu adds 2496ms and costs ~€27/month
- www.goethe.de adds 2145ms and costs ~€23/month
- Unattributable adds 1666ms and costs ~€18/month
- app.usercentrics.eu adds 870ms and costs ~€9/month
- Google Tag Manager adds 815ms and costs ~€9/month
- www.goethe.de adds 698ms and costs ~€8/month
- www.goethe.de adds 433ms and costs ~€5/month
- www.goethe.de adds 374ms and costs ~€4/month
- Google Tag Manager adds 366ms and costs ~€4/month
- www.goethe.de adds 207ms 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
privacy-proxy.usercentrics.eu takes 2496ms 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.goethe.de takes 2145ms 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 1666ms 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
app.usercentrics.eu takes 870ms 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
Google Tag Manager takes 815ms 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.goethe.de takes 698ms 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.goethe.de takes 433ms 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.goethe.de takes 374ms 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
Google Tag Manager takes 366ms 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.goethe.de takes 207ms 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
65% of www.goethe.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