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.
840 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.28 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.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.00 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.
2.35 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
DJS BundlesAction26 scripts, 417 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.swr.de/assets/ardplayer/7.11.0/ardplayer.js | 254 KB | 197 KB (78%) | ✓ | 3rd |
| https://www.swr.de/assets/firebasejs/12.1.0/firebase-firestore.js | 116 KB | 107 KB (93%) | ✓ | 3rd |
| https://www.swr.de/assets/js/swr-neu.min.js?b61c2ce6f39bccbba3d10a5ede0c7dc6 | 75 KB | 43 KB (57%) | ✓ | 3rd |
| https://www.swr.de/assets/js/common.min.js?685b9087d003e71fa2d41f9baa8ccad9 | 74 KB | 38 KB (52%) | ✓ | 3rd |
| https://www.swr.de/assets/firebasejs/12.1.0/firebase-auth.js | 42 KB | 32 KB (77%) | ✓ | 3rd |
| https://www.swr.de/assets/js/swr-neu-personalisierung.min.js?19851154ef75f3f29db512f8b52cf3f6 | 20 KB | — | ✓ | 3rd |
| https://www.swr.de/assets/js/swr-neu-videoplayer.min.js?d6eb0584ccf60c167d622ddb3da6d1cc | 6 KB | — | ✓ | 3rd |
| https://www.swr.de/assets/js/swr-neu-prefetch.min.js?6b30191b78729da2cbe7144ba62a0b60 | 2 KB | — | ✓ | 3rd |
| https://www.swr.de/assets/js/swr-neu-modules.min.js?fc8ec1a29f45eee212d81c1b0ebd031d | 1 KB | — | ✓ | 3rd |
| https://www.swr.de/assets/js/swr-neu-firebase-connector.min.js?d79c3013e4ffb0d7418e34bc7740bab3 | 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
FPage Weight InventoryAction86 resources · 1.9 MB · 417 KB savings availableFIX
~417.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 86 resources | 1.9 MiB | ||||||
CPage Weight BudgetAction1.9 MB transferred, 86 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
BImage Optimization28 images, 0 KB saveableREVIEW
BJS Execution Cost507ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.swr.de/ | 170ms | 16ms | 1ms | 3rd |
| https://www.swr.de/assets/ardplayer/7.11.0/ardplayer.js | 121ms | 100ms | 20ms | 3rd |
| Unattributable | 117ms | 3ms | 0ms | 3rd |
| https://www.swr.de/assets/js/swr-neu.min.js?b61c2ce6f39bccbba3d10a5ede0c7dc6 | 100ms | 52ms | 5ms | 3rd |
BHTTP CachingprivateREVIEW
private
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (361 KB)PASS
Web fonts
5
361 KB total
Render-blocking
0
of 5
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
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 ~115 KB and ~230 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 Waterfall86 requests over 881msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.swr.de www.swr.de | Other | 170ms | 40 KB | — | €2/mo | Optional |
www.swr.de www.swr.de | Other | 121ms | 254 KB | 78% | €1/mo | Optional |
Unattributable Unattributable | Other | 117ms | 0 KB | — | €1/mo | Optional |
www.swr.de www.swr.de | Other | 100ms | 75 KB | 57% | €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
78% of www.swr.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
57% of www.swr.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