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.
839 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.69 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
146 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.005
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.63 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.
2.43 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
BImage Optimization22 images, 0 KB saveableREVIEW
BJS Execution Cost954ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.ndr.de/resources/assets/main-ndr-1f956549396e0b20d0542c6e587ab1ddfcbbfa8c.js | 426ms | 64ms | 5ms | 3rd |
| https://www.ndr.de/ | 249ms | 2ms | 0ms | 3rd |
| https://www.ndr.de/resources/assets/resources/js/vendor/ardplayer/ardplayer-ndr-unified-7.12.0.7658f2f8.js | 177ms | 139ms | 38ms | 3rd |
| Unattributable | 101ms | 6ms | 0ms | 3rd |
CJS BundlesAction6 scripts, 218 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.ndr.de/resources/assets/resources/js/vendor/ardplayer/ardplayer-ndr-unified-7.12.0.7658f2f8.js | 276 KB | 218 KB (79%) | ✓ | 3rd |
| https://www.ndr.de/resources/assets/main-ndr-1f956549396e0b20d0542c6e587ab1ddfcbbfa8c.js | 43 KB | — | ✓ | 3rd |
| https://www.ndr.de/resources/assets/ardplayerstyles-1f956549396e0b20d0542c6e587ab1ddfcbbfa8c.chunk.js | 0 KB | — | ✓ | 3rd |
| https://www.ndr.de/resources/assets/datacardcss-1f956549396e0b20d0542c6e587ab1ddfcbbfa8c.chunk.js | 0 KB | — | ✓ | 3rd |
| https://www.ndr.de/resources/assets/datacards-1f956549396e0b20d0542c6e587ab1ddfcbbfa8c.chunk.js | 1 KB | — | ✓ | 3rd |
| https://www.ndr.de/resources/assets/ardplayer-1f956549396e0b20d0542c6e587ab1ddfcbbfa8c.chunk.js | 2 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
BPage Weight Inventory45 resources · 1019 KB · 218 KB savings availableREVIEW
~217.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 45 resources | 1018.7 KiB | ||||||
BHTTP CachingprivateREVIEW
private
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
APage Weight Budget1019 KB transferred, 45 requestsPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (194 KB)PASS
Web fonts
5
194 KB total
Render-blocking
0
of 5
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 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 Waterfall45 requests over 6171msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.ndr.de www.ndr.de | Other | 426ms | 43 KB | — | €5/mo | Costly |
www.ndr.de www.ndr.de | Other | 249ms | 52 KB | — | €3/mo | Costly |
www.ndr.de www.ndr.de | Other | 177ms | 276 KB | 79% | €2/mo | Optional |
Unattributable Unattributable | Other | 101ms | 0 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.ndr.de adds 426ms and costs ~€5/month
- www.ndr.de adds 249ms 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.ndr.de takes 426ms 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.ndr.de takes 249ms 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
79% of www.ndr.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