Consider code splitting or tree shaking to reduce unused code.
Why this matters
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.
Why this matters
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.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
✓
All text resources are compressed
All text resources are properly compressed.
A
Image Optimization
33 images, 0 KB saveable
PASS
33 images, 0 KB saveable
Info::
✓
All images are well-optimized
33images226 KB
0oversized-0 KB
2legacy format
0missing dimensionsCLS risk
A+
Font Loading
12 fonts (399 KB)
PASS
12 fonts (399 KB)
Info::
i
12 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
12
399 KB total
Render-blocking
0
of 12
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
SpiegelSlab4UICd-ExtraB...woff2swap
Size32 KB
Load time81 ms
Start256 ms
RiskFOUT — text flashes from fallback to web font
SpiegelSerifTextUI-Regu...woff2swap
Size40 KB
Load time67 ms
Start256 ms
RiskFOUT — text flashes from fallback to web font
SpiegelSerifTextUI-Ital...woff2swap
Size33 KB
Load time69 ms
Start256 ms
RiskFOUT — text flashes from fallback to web font
SpiegelSerifTextUI-Bold...woff2swap
Size31 KB
Load time70 ms
Start256 ms
RiskFOUT — text flashes from fallback to web font
SpiegelSerifTextUI-Bold...woff2swap
Size33 KB
Load time76 ms
Start257 ms
RiskFOUT — text flashes from fallback to web font
SpiegelSerifDisplayUI-B...woff2swap
Size34 KB
Load time72 ms
Start257 ms
RiskFOUT — text flashes from fallback to web font
SpiegelSans4UI-Regular....woff2swap
Size38 KB
Load time73 ms
Start259 ms
RiskFOUT — text flashes from fallback to web font
SpiegelSans4UI-Bold.woff2woff2swap
Size39 KB
Load time77 ms
Start259 ms
RiskFOUT — text flashes from fallback to web font
SpiegelSans4-6SemiBold....woff2swap
Size11 KB
Load time75 ms
Start259 ms
RiskFOUT — text flashes from fallback to web font
woff2;base64,d09GMk9UVE...woff2swap
Size32 KB
Load time41 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
woff2;base64,d09GMk9UVE...woff2swap
Size38 KB
Load time43 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
woff2;base64,d09GMk9UVE...woff2swap
Size39 KB
Load time44 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
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)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
✓
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
✓
No render-blocking resources detected
A+
Resource Hints
18 hints, 0 missing preconnects
PASS
18 hints, 0 missing preconnects
Info::
✓
Page uses 18 resource hint(s)
Current Resource Hints
preconnect
2
preload
+4
14
dns-prefetch
2
prefetch—
18 resource hints configured
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
✓
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Link11 GmbH
Network Waterfall
74 requests over 2994ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100%of JavaScript execution is third-party
First-party Third-party3768ms · 597KB · €18/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.spiegel.de
www.spiegel.de
Other
1594ms
224 KB
—
€7/mo
Costly
sp-spiegel-de.spiegel.de
sp-spiegel-de.spiegel.de
Other
525ms
42 KB
—
€2/mo
Costly
sp-spiegel-de.spiegel.de
sp-spiegel-de.spiegel.de
Other
506ms
91 KB
69%
€2/mo
Costly
Unattributable
Unattributable
Other
433ms
0 KB
—
€2/mo
Costly
cdn.prod.www.spiegel.de
cdn.prod.www.spiegel.de
Other
245ms
55 KB
77%
€1/mo
Costly
assets.adobedtm.com
assets.adobedtm.com
Other
210ms
119 KB
20%
€1/mo
Costly
cdn.prod.www.spiegel.de
cdn.prod.www.spiegel.de
Other
150ms
29 KB
—
€1/mo
Optional
cdn.prod.www.spiegel.de
cdn.prod.www.spiegel.de
Other
55ms
4 KB
—
€0/mo
Optional
cdn.prod.www.spiegel.de
cdn.prod.www.spiegel.de
Other
50ms
33 KB
—
€0/mo
Optional
www.spiegel.de
Other
Costly
Execution1594ms
Transfer224 KB
Monthly Cost€7/mo
sp-spiegel-de.spiegel.de
Other
Costly
Execution525ms
Transfer42 KB
Monthly Cost€2/mo
sp-spiegel-de.spiegel.de
Other
Costly
Execution506ms
Transfer91 KB
Unused69%
Monthly Cost€2/mo
Unattributable
Other
Costly
Execution433ms
Transfer0 KB
Monthly Cost€2/mo
cdn.prod.www.spiegel.de
Other
Costly
Execution245ms
Transfer55 KB
Unused77%
Monthly Cost€1/mo
assets.adobedtm.com
Other
Costly
Execution210ms
Transfer119 KB
Unused20%
Monthly Cost€1/mo
cdn.prod.www.spiegel.de
Other
Optional
Execution150ms
Transfer29 KB
Monthly Cost€1/mo
cdn.prod.www.spiegel.de
Other
Optional
Execution55ms
Transfer4 KB
Monthly Cost€0/mo
cdn.prod.www.spiegel.de
Other
Optional
Execution50ms
Transfer33 KB
Monthly Cost€0/mo
These scripts may cost more than they're worth
www.spiegel.de adds 1594ms and costs ~€7/month
sp-spiegel-de.spiegel.de adds 525ms and costs ~€2/month
sp-spiegel-de.spiegel.de adds 506ms and costs ~€2/month
Unattributable adds 433ms and costs ~€2/month
cdn.prod.www.spiegel.de adds 245ms and costs ~€1/month
assets.adobedtm.com adds 210ms and costs ~€1/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
Why this matters
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.spiegel.de takes 1594ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
Why this matters
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
sp-spiegel-de.spiegel.de takes 525ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
Why this matters
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
sp-spiegel-de.spiegel.de takes 506ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
Why this matters
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
69% of sp-spiegel-de.spiegel.de's code is unused. The script may be loading features you don't use.
Why this matters
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
Unattributable takes 433ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
Why this matters
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
cdn.prod.www.spiegel.de takes 245ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
Why this matters
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
77% of cdn.prod.www.spiegel.de's code is unused. The script may be loading features you don't use.
Why this matters
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
assets.adobedtm.com takes 210ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
Why this matters
This script has high main-thread execution time — optimize hot paths or defer.