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.
657 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.49 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
24 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.
1.22 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.
2.12 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS BundlesAction30 scripts, 436 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://player.h-cdn.com/loader.js?customer=ard_de&no_conf=true&md5=933738-0acf1ad1 | 244 KB | 169 KB (70%) | ✓ | 3rd |
| https://www.tagesschau.de/resources/assets/9860-04797034dec49ec10d84.chunk.bundle.js | 255 KB | 156 KB (61%) | ✓ | 3rd |
| https://www.tagesschau.de/resources/assets/modern-20c517e20810c30c1af7.bundle.js | 176 KB | 88 KB (50%) | ✓ | 3rd |
| https://www.tagesschau.de/resources/assets/8354-f0ee7055d7d9e2ac857f.chunk.bundle.js | 28 KB | 22 KB (80%) | ✓ | 3rd |
| https://www.tagesschau.de/resources/assets/8953-cf738b89233a310b4e23.chunk.bundle.js | 2 KB | — | ✓ | 3rd |
| https://www.tagesschau.de/resources/assets/4812-0abfdc3d9a383d3baaca.chunk.bundle.js | 8 KB | — | ✓ | 3rd |
| https://www.tagesschau.de/resources/assets/5778-1035c48dfbff11a45f47.chunk.bundle.js | 2 KB | — | ✓ | 3rd |
| https://www.tagesschau.de/resources/assets/2164-8d4cece496f91f0fddc9.chunk.bundle.js | 2 KB | — | ✓ | 3rd |
| https://www.tagesschau.de/resources/assets/4050-7224dc61b031deda6400.chunk.bundle.js | 5 KB | — | ✓ | 3rd |
| https://www.tagesschau.de/resources/assets/6163-84d0ae7ea8baee3a9502.chunk.bundle.js | 4 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
FPage Weight InventoryAction65 resources · 1.9 MB · 436 KB savings availableFIX
~436.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 65 resources | 1.9 MiB | ||||||
CPage Weight BudgetAction1.9 MB transferred, 65 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
CImage OptimizationAction19 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
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
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.
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
CJS Execution CostAction1306ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.tagesschau.de/resources/assets/modern-20c517e20810c30c1af7.bundle.js | 512ms | 349ms | 12ms | 3rd |
| https://www.tagesschau.de/ | 269ms | 3ms | 0ms | 3rd |
| Unattributable | 215ms | 3ms | 0ms | 3rd |
| https://player.h-cdn.com/loader.js?customer=ard_de&no_conf=true&md5=933738-0acf1ad1 | 209ms | 170ms | 18ms | 3rd |
| https://www.tagesschau.de/resources/assets/9860-04797034dec49ec10d84.chunk.bundle.js | 100ms | 66ms | 29ms | 3rd |
BHTTP CachingprivateREVIEW
private
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading6 fonts (477 KB)PASS
Web fonts
6
477 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- 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 ~232 KB and ~464 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 Waterfall65 requests over 15566msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.tagesschau.de www.tagesschau.de | Other | 512ms | 176 KB | 50% | €6/mo | Costly |
www.tagesschau.de www.tagesschau.de | Other | 269ms | 128 KB | — | €3/mo | Costly |
Unattributable Unattributable | Other | 215ms | 0 KB | — | €2/mo | Costly |
player.h-cdn.com player.h-cdn.com | Other | 209ms | 244 KB | 70% | €2/mo | Costly |
www.tagesschau.de www.tagesschau.de | Other | 100ms | 255 KB | 61% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.tagesschau.de adds 512ms and costs ~€6/month
- www.tagesschau.de adds 269ms and costs ~€3/month
- Unattributable adds 215ms and costs ~€2/month
- player.h-cdn.com adds 209ms 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
www.tagesschau.de takes 512ms 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
50% of www.tagesschau.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
www.tagesschau.de takes 269ms 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 215ms 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
player.h-cdn.com takes 209ms 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
70% of player.h-cdn.com'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
61% of www.tagesschau.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