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.
1.53 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.93 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
36 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.012
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.02 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.
3.04 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS BundlesAction67 scripts, 333 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://code.piano.io/api/tinypass.min.js | 132 KB | 82 KB (63%) | ✓ | 3rd |
| https://consent-cdn.zeit.de/Notice.8f529.js | 91 KB | 63 KB (69%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MH96D5 | 180 KB | 62 KB (40%) | ✓ | 3rd |
| https://sp.zon.zeit.de/4.6.6/rl9os54c.js | 80 KB | 39 KB (49%) | ✓ | 3rd |
| https://interactive.zeit.de/g/wiegehtesihnen/app.5b89d5abbb910dab2c6e.cached.js | 45 KB | 22 KB (49%) | ✓ | 3rd |
| https://consent-cdn.zeit.de/wrapperMessagingWithoutDetection.js | 51 KB | 22 KB (43%) | ✓ | 3rd |
| https://cdn.cxense.com/cx.js | 38 KB | 21 KB (57%) | ✓ | 3rd |
| https://cdn.cxense.com/cx.js | 38 KB | 21 KB (57%) | ✓ | 3rd |
| https://static.zeit.de/p/zeit.web/js/2638.54757e17384f0478.js | 1 KB | — | ✓ | 3rd |
| https://static.zeit.de/p/zeit.web/js/9398.7e9a0cc8a9f889a7.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 InventoryAction130 resources · 1.9 MB · 333 KB savings availableFIX
~332.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 130 resources | 1.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.9 MB transferred, 130 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
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
BImage Optimization8 images, 0 KB saveableREVIEW
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
CJS Execution CostAction1717ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.zeit.de/index | 730ms | 48ms | 6ms | 3rd |
| Unattributable | 238ms | 25ms | 0ms | 3rd |
| https://consent-cdn.zeit.de/Notice.8f529.js | 184ms | 137ms | 12ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MH96D5 | 130ms | 108ms | 20ms | 3rd |
| https://code.piano.io/api/tinypass.min.js | 114ms | 87ms | 15ms | 3rd |
| https://consent-cdn.zeit.de/wrapperMessagingWithoutDetection.js | 99ms | 56ms | 8ms | 3rd |
| https://static.zeit.de/iqd/cdn_iqdzeit/live/iqadcontroller.js | 88ms | 35ms | 27ms | 3rd |
| https://cdn.storifyme.xyz/static/web-components/storifyme-elements-v2.min.js | 70ms | 38ms | 5ms | 3rd |
| https://interactive.zeit.de/g/wiegehtesihnen/app.5b89d5abbb910dab2c6e.cached.js | 65ms | 46ms | 5ms | 3rd |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading7 fonts (191 KB)PASS
Web fonts
7
191 KB total
Render-blocking
0
of 7
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 ~10 KB and ~20 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Google Cloud
Network Waterfall130 requests over 5910msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.zeit.de www.zeit.de | Other | 730ms | 326 KB | — | €8/mo | Costly |
Unattributable Unattributable | Other | 238ms | 0 KB | — | €3/mo | Costly |
consent-cdn.zeit.de consent-cdn.zeit.de | Other | 184ms | 91 KB | 69% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 130ms | 180 KB | 40% | €1/mo | Optional |
code.piano.io code.piano.io | Other | 114ms | 132 KB | 63% | €1/mo | Optional |
consent-cdn.zeit.de consent-cdn.zeit.de | Other | 99ms | 51 KB | 43% | €1/mo | Optional |
static.zeit.de static.zeit.de | Other | 88ms | 70 KB | — | €1/mo | Optional |
cdn.storifyme.xyz cdn.storifyme.xyz | Other | 70ms | 32 KB | — | €1/mo | Optional |
interactive.zeit.de interactive.zeit.de | Other | 65ms | 45 KB | 49% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.zeit.de adds 730ms and costs ~€8/month
- Unattributable adds 238ms 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.zeit.de takes 730ms 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 238ms 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
69% of consent-cdn.zeit.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
63% of code.piano.io'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