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.
609 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.
12 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
647 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
2.28 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 sDPage Weight BudgetAction2.3 MB transferred, 79 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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS BundlesAction25 scripts, 188 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://exporte.wdr.de/player/current/v-6.9.4/ardplayer-wdr.js?t=20564 | 207 KB | 163 KB (79%) | ✓ | 3rd |
| https://www1.wdr.de/assets-v5.174.4/js/external/jquery-3.7.1.min.js | 38 KB | 25 KB (65%) | ✗ | 3rd |
| https://www1.wdr.de/assets-v5.174.4/js/Header-B7vevfZP.js | 29 KB | — | ✓ | 3rd |
| https://www1.wdr.de/assets/js/Base-BouCSPYx.js | 1 KB | — | ✓ | 3rd |
| https://www1.wdr.de/resizer-kw-25-dimap-iframe100.js | 0 KB | — | ✓ | 3rd |
| https://www1.wdr.de/wahlembed-fix100.js | 0 KB | — | ✓ | 3rd |
| https://www1.wdr.de/searchFormBugFix100.js | 2 KB | — | ✓ | 3rd |
| https://www1.wdr.de/iframeresizer102.js | 6 KB | — | ✓ | 3rd |
| https://www1.wdr.de/assets-v5.174.4/js/main.js | 0 KB | — | ✓ | 3rd |
| https://www1.wdr.de/assets-v5.174.4/js/TeaserNormal-Al0UQ5Sy.js | 0 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
DPage Weight InventoryAction79 resources · 2.3 MB · 188 KB savings availableFIX
~187.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 79 resources | 2.3 MiB | ||||||
CImage OptimizationAction30 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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+JS Execution Cost353ms total JS executionPASS
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www1.wdr.de/index.html | 186ms | 9ms | 7ms | 3rd |
| Unattributable | 93ms | 4ms | 0ms | 3rd |
| https://exporte.wdr.de/player/current/v-6.9.4/ardplayer-wdr.js?t=20564 | 74ms | 55ms | 18ms | 3rd |
A+Font Loading4 fonts (387 KB)PASS
Web fonts
4
387 KB total
Render-blocking
0
of 4
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
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 ~171 KB and ~342 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
AHTTP Cachingmax-age=120 (2 minutes)PASS
max-age=120
| Directive | Value | Meaning |
|---|---|---|
| max-age | 120 | Cache for 2 minutes |
Network Waterfall79 requests over 959msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www1.wdr.de www1.wdr.de | Other | 186ms | 34 KB | — | €2/mo | Optional |
Unattributable Unattributable | Other | 93ms | 0 KB | — | €1/mo | Optional |
exporte.wdr.de exporte.wdr.de | Other | 74ms | 207 KB | 79% | €1/mo | Optional |
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
79% of exporte.wdr.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