Performance
· 14 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.
1.76 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.60 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.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.76 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.
2.60 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction90 resources · 1.8 MB · 23 KB savings availableFIX
~23.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 90 resources | 1.8 MiB | ||||||
CPage Weight BudgetAction1.8 MB transferred, 90 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 OptimizationAction4 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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingno-cacheREVIEW
no-cache
| Directive | Value | Meaning |
|---|---|---|
| no-cache | — | Cache but always revalidate first |
A+Text CompressionAll text resources are compressedPASS
A+JS Execution CostNo JS execution dataPASS
A+Font Loading6 fonts (460 KB)PASS
Web fonts
6
460 KB total
Render-blocking
0
of 6
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 ~29 KB and ~58 ms
A+JS Bundles62 scripts, 23 KB unusedPASS
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.myfritz.net/devices/assets/extra-app-config.js?v=4.6.120 | 4 KB | 23 KB (81%) | ✓ | 3rd |
| https://sso.myfritz.net/static/js/reporting-bundle.js | 2 KB | — | ✓ | 3rd |
| https://sso.myfritz.net/static/js/jquery.slim.min.js?v=4.6.120 | 38 KB | — | ✓ | 3rd |
| https://sso.myfritz.net/static/js/popper.min.js?v=4.6.120 | 12 KB | — | ✓ | 3rd |
| https://sso.myfritz.net/static/js/bootstrap.min.js?v=4.6.120 | 27 KB | — | ✓ | 3rd |
| https://www.myfritz.net/devices/chunk-N5UCCROT.js | 4 KB | — | ✓ | 3rd |
| https://www.myfritz.net/devices/chunk-V3YLUSRR.js | 23 KB | — | ✗ | 3rd |
| https://www.myfritz.net/devices/chunk-2LZ4GHLU.js | 21 KB | — | ✓ | 3rd |
| https://www.myfritz.net/devices/chunk-JQRWJSS2.js | 18 KB | — | ✗ | 3rd |
| https://www.myfritz.net/devices/chunk-IHXFO6QB.js | 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