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
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
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/2026/04/15/76fb5863-96... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/04/15/7c266ecd-6f... 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/2026/04/15/99f259ca-36... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/04/09/16f50901-2f... 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/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/2026/04/15/6ab82db5-05... 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/2026/04/15/74a16270-08... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sueddeutsche.de/2026/04/15/ce854963-d4... 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/2026/04/15/0ec9d627-09... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
33images506 KB
0oversized-0 KB
13legacy format
15missing 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
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
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)
67b8a55e7fdd6808a987472...woff2swap
Size22 KB
Load time53 ms
Start281 ms
RiskFOUT — text flashes from fallback to web font
e117a79bf09a4a75acc1f98...woff2swap
Size23 KB
Load time58 ms
Start281 ms
RiskFOUT — text flashes from fallback to web font
217e1fa86dcffb1f4f0ce5b...woff2swap
Size23 KB
Load time57 ms
Start281 ms
RiskFOUT — text flashes from fallback to web font
c8c2bcbcf9b2beb9ab68949...woff2swap
Size16 KB
Load time51 ms
Start284 ms
RiskFOUT — text flashes from fallback to web font
d202b291ffe3c074c83b3e6...woff2swap
Size23 KB
Load time54 ms
Start285 ms
RiskFOUT — text flashes from fallback to web font
b1f05a6d991bac01f7b690a...woff2swap
Size31 KB
Load time20 ms
Start343 ms
RiskFOUT — text flashes from fallback to web font
2c7636c98303f1059d2e553...woff2swap
Size30 KB
Load time20 ms
Start346 ms
RiskFOUT — text flashes from fallback to web font
5f43676094b26f440591ad7...woff2swap
Size31 KB
Load time21 ms
Start497 ms
RiskFOUT — text flashes from fallback to web font
b8cc1746c0a8538cd47c135...woff2swap
Size15 KB
Load time20 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
b5e0e178c2959ba0ed0e3a5...woff2swap
Size14 KB
Load time20 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
4e10fe1ffaa4436c37f6c45...woff2swap
Size15 KB
Load time20 ms
Start1.9 s
RiskFOUT — text flashes from fallback to web font
b8cc1746c0a8538cd47c135...woff2swap
Size0 KB
Load time21 ms
Start1.9 s
RiskFOUT — text flashes from fallback to web font
b5e0e178c2959ba0ed0e3a5...woff2swap
Size0 KB
Load time21 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
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
Network Waterfall
115 requests over 6122ms
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-party12202ms · 1492KB · €132/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.sueddeutsche.de
www.sueddeutsche.de
Other
4683ms
294 KB
—
€51/mo
Costly
www.sueddeutsche.de
www.sueddeutsche.de
Other
2896ms
171 KB
52%
€31/mo
Costly
Unattributable
Unattributable
Other
869ms
0 KB
—
€9/mo
Costly
wni4spsbqo.kameleoon.eu
wni4spsbqo.kameleoon.eu
Other
779ms
45 KB
—
€8/mo
Costly
consent-cdn.sueddeutsche.de
consent-cdn.sueddeutsche.de
Other
584ms
91 KB
68%
€6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
560ms
179 KB
39%
€6/mo
Costly
www.sueddeutsche.de
www.sueddeutsche.de
Other
324ms
121 KB
48%
€4/mo
Costly
cdn.sueddeutsche.de
cdn.sueddeutsche.de
Other
310ms
132 KB
61%
€3/mo
Costly
consent-cdn.sueddeutsche.de
consent-cdn.sueddeutsche.de
Other
281ms
42 KB
—
€3/mo
Costly
s.hs-data.com
s.hs-data.com
Other
178ms
54 KB
67%
€2/mo
Optional
www.sueddeutsche.de
www.sueddeutsche.de
Other
143ms
65 KB
58%
€2/mo
Optional
www.sueddeutsche.de
www.sueddeutsche.de
Other
137ms
76 KB
—
€1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
126ms
116 KB
56%
€1/mo
Optional
btloader.com
btloader.com
Other
108ms
31 KB
—
€1/mo
Optional
www.sueddeutsche.de
www.sueddeutsche.de
Other
61ms
30 KB
88%
€1/mo
Optional
www.sueddeutsche.de
www.sueddeutsche.de
Other
59ms
4 KB
—
€1/mo
Optional
consent-cdn.sueddeutsche.de
consent-cdn.sueddeutsche.de
Other
53ms
2 KB
—
€1/mo
Optional
cdn.cxense.com
cdn.cxense.com
Other
51ms
38 KB
65%
€1/mo
Optional
www.sueddeutsche.de
Other
Costly
Execution4683ms
Transfer294 KB
Monthly Cost€51/mo
www.sueddeutsche.de
Other
Costly
Execution2896ms
Transfer171 KB
Unused52%
Monthly Cost€31/mo
Unattributable
Other
Costly
Execution869ms
Transfer0 KB
Monthly Cost€9/mo
wni4spsbqo.kameleoon.eu
Other
Costly
Execution779ms
Transfer45 KB
Monthly Cost€8/mo
consent-cdn.sueddeutsche.de
Other
Costly
Execution584ms
Transfer91 KB
Unused68%
Monthly Cost€6/mo
Google Tag Manager
Tag Manager
Costly
Execution560ms
Transfer179 KB
Unused39%
Monthly Cost€6/mo
www.sueddeutsche.de
Other
Costly
Execution324ms
Transfer121 KB
Unused48%
Monthly Cost€4/mo
cdn.sueddeutsche.de
Other
Costly
Execution310ms
Transfer132 KB
Unused61%
Monthly Cost€3/mo
consent-cdn.sueddeutsche.de
Other
Costly
Execution281ms
Transfer42 KB
Monthly Cost€3/mo
s.hs-data.com
Other
Optional
Execution178ms
Transfer54 KB
Unused67%
Monthly Cost€2/mo
www.sueddeutsche.de
Other
Optional
Execution143ms
Transfer65 KB
Unused58%
Monthly Cost€2/mo
www.sueddeutsche.de
Other
Optional
Execution137ms
Transfer76 KB
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution126ms
Transfer116 KB
Unused56%
Monthly Cost€1/mo
btloader.com
Other
Optional
Execution108ms
Transfer31 KB
Monthly Cost€1/mo
www.sueddeutsche.de
Other
Optional
Execution61ms
Transfer30 KB
Unused88%
Monthly Cost€1/mo
www.sueddeutsche.de
Other
Optional
Execution59ms
Transfer4 KB
Monthly Cost€1/mo
consent-cdn.sueddeutsche.de
Other
Optional
Execution53ms
Transfer2 KB
Monthly Cost€1/mo
cdn.cxense.com
Other
Optional
Execution51ms
Transfer38 KB
Unused65%
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.sueddeutsche.de adds 4683ms and costs ~€51/month
www.sueddeutsche.de adds 2896ms and costs ~€31/month
Unattributable adds 869ms and costs ~€9/month
wni4spsbqo.kameleoon.eu adds 779ms and costs ~€8/month
consent-cdn.sueddeutsche.de adds 584ms and costs ~€6/month
Google Tag Manager adds 560ms and costs ~€6/month
www.sueddeutsche.de adds 324ms and costs ~€4/month
cdn.sueddeutsche.de adds 310ms and costs ~€3/month
consent-cdn.sueddeutsche.de adds 281ms and costs ~€3/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 4683ms 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 2896ms 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
Unattributable takes 869ms 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
wni4spsbqo.kameleoon.eu takes 779ms 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
consent-cdn.sueddeutsche.de takes 584ms 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
Google Tag Manager takes 560ms 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 324ms 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.sueddeutsche.de takes 310ms 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
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
consent-cdn.sueddeutsche.de takes 281ms 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
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.
Source: web.dev
58% 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
56% of Google Tag Manager'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
88% 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
65% of cdn.cxense.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.