Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
C
Image Optimization
Action
34 images, 0 KB saveable
REVIEW
34 images, 0 KB saveable
Warning::
!
https://www.sueddeutsche.de/2026/04/15/99f259ca-36... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/04/15/7c266ecd-6f... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/04/11/272538bc-4c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/04/12/83746620-10... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/04/15/1ef8ac6e-2e... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/04/14/2e99fe44-6c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/04/15/0ec9d627-09... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/04/15/76fb5863-96... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/04/15/d03ec730-71... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2024/08/28/28a90721-84... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/04/15/74a16270-08... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2023/04/04/709b8f19-36... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/04/15/ef605795-66... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/03/26/2ea65c58-41... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/04/15/ce854963-d4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
34images484 KB
0oversized-0 KB
13legacy format
16missing dimensionsCLS risk
Set explicit width and height to prevent CLS.
Why this matters
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.
Why this matters
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.
Why this matters
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.
Why this matters
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.
Why this matters
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.
Why this matters
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.
Why this matters
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.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Set explicit width and height to prevent CLS.
Why this matters
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.
Why this matters
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.
Why this matters
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.
Why this matters
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.
Why this matters
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.
Why this matters
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.
Why this matters
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.
Why this matters
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW
Green Hosting
No green hosting detected
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+
Font Loading
13 fonts (244 KB)
PASS
13 fonts (244 KB)
Info::
i
13 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
13
244 KB total
Render-blocking
0
of 13
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
c8c2bcbcf9b2beb9ab68949...woff2swap
Size16 KB
Load time26 ms
Start269 ms
RiskFOUT — text flashes from fallback to web font
d202b291ffe3c074c83b3e6...woff2swap
Size23 KB
Load time28 ms
Start270 ms
RiskFOUT — text flashes from fallback to web font
217e1fa86dcffb1f4f0ce5b...woff2swap
Size23 KB
Load time28 ms
Start270 ms
RiskFOUT — text flashes from fallback to web font
e117a79bf09a4a75acc1f98...woff2swap
Size23 KB
Load time30 ms
Start270 ms
RiskFOUT — text flashes from fallback to web font
67b8a55e7fdd6808a987472...woff2swap
Size22 KB
Load time30 ms
Start270 ms
RiskFOUT — text flashes from fallback to web font
b1f05a6d991bac01f7b690a...woff2swap
Size31 KB
Load time20 ms
Start316 ms
RiskFOUT — text flashes from fallback to web font
2c7636c98303f1059d2e553...woff2swap
Size30 KB
Load time19 ms
Start321 ms
RiskFOUT — text flashes from fallback to web font
5f43676094b26f440591ad7...woff2swap
Size31 KB
Load time20 ms
Start462 ms
RiskFOUT — text flashes from fallback to web font
b8cc1746c0a8538cd47c135...woff2swap
Size15 KB
Load time21 ms
Start538 ms
RiskFOUT — text flashes from fallback to web font
b5e0e178c2959ba0ed0e3a5...woff2swap
Size14 KB
Load time20 ms
Start538 ms
RiskFOUT — text flashes from fallback to web font
4e10fe1ffaa4436c37f6c45...woff2swap
Size15 KB
Load time22 ms
Start1.9 s
RiskFOUT — text flashes from fallback to web font
b5e0e178c2959ba0ed0e3a5...woff2swap
Size0 KB
Load time22 ms
Start1.9 s
RiskFOUT — text flashes from fallback to web font
b8cc1746c0a8538cd47c135...woff2swap
Size0 KB
Load time22 ms
Start1.9 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
No optimization needed
PASS
No optimization needed
Info::
✓
No resource hint issues
Network Waterfall
120 requests over 6150ms
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-party3171ms · 1128KB · €34/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.sueddeutsche.de
www.sueddeutsche.de
Other
1235ms
293 KB
—
€13/mo
Costly
www.sueddeutsche.de
www.sueddeutsche.de
Other
879ms
171 KB
52%
€10/mo
Costly
wni4spsbqo.kameleoon.eu
wni4spsbqo.kameleoon.eu
Other
266ms
45 KB
—
€3/mo
Costly
Unattributable
Unattributable
Other
220ms
0 KB
—
€2/mo
Costly
consent-cdn.sueddeutsche.de
consent-cdn.sueddeutsche.de
Other
142ms
91 KB
68%
€2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
132ms
179 KB
39%
€1/mo
Optional
cdn.sueddeutsche.de
cdn.sueddeutsche.de
Other
89ms
132 KB
61%
€1/mo
Optional
www.sueddeutsche.de
www.sueddeutsche.de
Other
82ms
120 KB
48%
€1/mo
Optional
consent-cdn.sueddeutsche.de
consent-cdn.sueddeutsche.de
Other
71ms
42 KB
—
€1/mo
Optional
s.hs-data.com
s.hs-data.com
Other
56ms
54 KB
67%
€1/mo
Optional
www.sueddeutsche.de
Other
Costly
Execution1235ms
Transfer293 KB
Monthly Cost€13/mo
www.sueddeutsche.de
Other
Costly
Execution879ms
Transfer171 KB
Unused52%
Monthly Cost€10/mo
wni4spsbqo.kameleoon.eu
Other
Costly
Execution266ms
Transfer45 KB
Monthly Cost€3/mo
Unattributable
Other
Costly
Execution220ms
Transfer0 KB
Monthly Cost€2/mo
consent-cdn.sueddeutsche.de
Other
Optional
Execution142ms
Transfer91 KB
Unused68%
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution132ms
Transfer179 KB
Unused39%
Monthly Cost€1/mo
cdn.sueddeutsche.de
Other
Optional
Execution89ms
Transfer132 KB
Unused61%
Monthly Cost€1/mo
www.sueddeutsche.de
Other
Optional
Execution82ms
Transfer120 KB
Unused48%
Monthly Cost€1/mo
consent-cdn.sueddeutsche.de
Other
Optional
Execution71ms
Transfer42 KB
Monthly Cost€1/mo
s.hs-data.com
Other
Optional
Execution56ms
Transfer54 KB
Unused67%
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.sueddeutsche.de adds 1235ms and costs ~€13/month
www.sueddeutsche.de adds 879ms and costs ~€10/month
wni4spsbqo.kameleoon.eu adds 266ms and costs ~€3/month
Unattributable adds 220ms and costs ~€2/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.sueddeutsche.de takes 1235ms 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
www.sueddeutsche.de takes 879ms 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
52% of www.sueddeutsche.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
wni4spsbqo.kameleoon.eu takes 266ms 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
Unattributable takes 220ms 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
68% of consent-cdn.sueddeutsche.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
61% of cdn.sueddeutsche.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
67% of s.hs-data.com'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.