Performance
· 26 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.
3.94 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.24 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
249 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.
5.13 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.
6.48 s
Page Load Progression
DPage Weight BudgetAction2.2 MB transferred, 108 requestsFIX
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction3905ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.webnetz.de/build/assets/site-128f0841.js | 1614ms | 653ms | 0ms | 3rd |
| https://privacy-proxy.usercentrics.eu/latest/uc-block.bundle.js | 744ms | 632ms | 11ms | 3rd |
| Unattributable | 686ms | 14ms | 0ms | 3rd |
| https://www.webnetz.de/ | 675ms | 7ms | 4ms | 3rd |
| https://web.cmp.usercentrics.eu/ui/v/3.119.0/WebSdk.lib.5ddd9ff8.js | 121ms | 96ms | 21ms | 3rd |
| https://web.cmp.usercentrics.eu/ui/v/3.119.0/UcGdprCmpView.b05dbc41.js | 66ms | 2ms | 7ms | 3rd |
DPage Weight InventoryAction108 resources · 2.2 MB · 131 KB savings availableFIX
~131.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 108 resources | 2.2 MiB | ||||||
BImage Optimization72 images, 0 KB saveableREVIEW
BJS Bundles15 scripts, 131 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.webnetz.de/build/assets/site-128f0841.js | 152 KB | 96 KB (63%) | ✓ | 3rd |
| https://web.cmp.usercentrics.eu/ui/v/3.119.0/WebSdk.lib.5ddd9ff8.js | 56 KB | 35 KB (63%) | ✓ | 3rd |
| https://web.cmp.usercentrics.eu/ui/loader.js | 16 KB | — | ✓ | 3rd |
| https://www.webnetz.de/build/assets/barlow-v12-latin-600-4ed993c7.js | 0 KB | — | ✓ | 3rd |
| https://www.webnetz.de/build/assets/barlow-v12-latin-500-4ed993c7.js | 0 KB | — | ✓ | 3rd |
| https://privacy-proxy.usercentrics.eu/latest/uc-block.bundle.js | 30 KB | — | ✓ | 3rd |
| https://www.webnetz.de/build/assets/barlow-v12-latin-300-4ed993c7.js | 0 KB | — | ✓ | 3rd |
| https://crm.zoho.eu/crm/javascript/zcga.js | 3 KB | — | ✓ | 3rd |
| https://www.webnetz.de/build/assets/barlow-v12-latin-regular-4ed993c7.js | 0 KB | — | ✓ | 3rd |
| https://web.cmp.usercentrics.eu/ui/v/3.119.0/GdprCmpController.597ef4e9.js | 9 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
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
CCompression AlgorithmActionMain response served uncompressedREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
BJavaScript Blocking2 JS blocking issue(s) detectedREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingmax-age=0REVIEW
max-age=0
| Directive | Value | Meaning |
|---|---|---|
| max-age | 0 | Cache for 0 seconds |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading9 fonts (133 KB)PASS
Web fonts
9
133 KB total
Render-blocking
0
of 9
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 ~15 KB and ~30 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
AResource Hints15 hints, 0 missing preconnectsPASS
Current Resource Hints
15 resource hints configured
Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: https://www.webnetz.de/build/assets/barlow-v12-latin-300-4ed993c7.js, https://www.webnetz.de/build/assets/barlow-v12-latin-regular-4ed993c7.js, https://www.webnetz.de/build/assets/barlow-v12-latin-500-4ed993c7.js (+1 more). Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
Performance issues directly impact user engagement and conversion rates.
A+LCP Image PreloadLCP preload audit not availablePASS
A+Main HTML Cache-ControlMain HTML max-age=0 (≤ 5min) is appropriatePASS
A+Server Response Intelligence1 server-response signal(s) detectedPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+CSS Performance DepthNo CSS performance depth issues detectedPASS
Network Waterfall108 requests over 2590msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.webnetz.de www.webnetz.de | Other | 1614ms | 152 KB | 63% | €8/mo | Costly |
privacy-proxy.usercentrics.eu privacy-proxy.usercentrics.eu | Other | 744ms | 30 KB | — | €3/mo | Costly |
Unattributable Unattributable | Other | 686ms | 0 KB | — | €3/mo | Costly |
www.webnetz.de www.webnetz.de | Other | 675ms | 54 KB | — | €3/mo | Costly |
web.cmp.usercentrics.eu web.cmp.usercentrics.eu | Other | 121ms | 56 KB | 63% | €1/mo | Optional |
web.cmp.usercentrics.eu web.cmp.usercentrics.eu | Other | 66ms | 18 KB | — | €0/mo | Optional |
These scripts may cost more than they're worth
- www.webnetz.de adds 1614ms and costs ~€8/month
- privacy-proxy.usercentrics.eu adds 744ms and costs ~€3/month
- Unattributable adds 686ms and costs ~€3/month
- www.webnetz.de adds 675ms 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.webnetz.de takes 1614ms 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
63% of www.webnetz.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
privacy-proxy.usercentrics.eu takes 744ms 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 686ms 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.webnetz.de takes 675ms 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
63% of web.cmp.usercentrics.eu'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
Image Optimization129 images, 249 KB total, 38 KB wastedINFO
Image Optimization Audit
Total Images
129
Total Size
249 KB
Oversized
9
Wasted
38 KB