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.
B
Image Optimization
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
!
https://webapi.project-syndicate.org/library/a6fde... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19images1.2 MB
0oversized-0 KB
19legacy format
1missing 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
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
5 fonts (302 KB)
PASS
5 fonts (302 KB)
Info::
i
5 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
5
302 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
bold.woff2woff2swap
Size20 KB
Load time46 ms
Start293 ms
RiskFOUT — text flashes from fallback to web font
o-0bIpQlx3QUlC5A4PNB6Ry...woff2swap
Size35 KB
Load time73 ms
Start594 ms
RiskFOUT — text flashes from fallback to web font
ga6daw1J5X9T9RW6j9bNVls...woff2swap
Size36 KB
Load time65 ms
Start595 ms
RiskFOUT — text flashes from fallback to web font
o-0bIpQlx3QUlC5A4PNB6Ry...woff2swap
Size164 KB
Load time95 ms
Start595 ms
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
ga6faw1J5X9T9RW6j9bNfFI...woff2swap
Size47 KB
Load time77 ms
Start595 ms
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)
Fixing the unchecked items could save ~82 KB and ~164 ms
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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
✓
Page uses 7 resource hint(s)
Current Resource Hints
preconnect
3
preload
1
dns-prefetch
3
prefetch—
7 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
Network Waterfall
72 requests over 2635ms
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-party2708ms · 985KB · €14/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.project-syndicate.org
www.project-syndicate.org
Other
655ms
55 KB
—
€3/mo
Costly
Unattributable
Unattributable
Other
305ms
0 KB
—
€2/mo
Costly
ajax.googleapis.com
ajax.googleapis.com
Other
300ms
30 KB
—
€2/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
226ms
157 KB
41%
€1/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
222ms
171 KB
42%
€1/mo
Costly
Microsoft Clarity
scripts.clarity.ms
Session Replay
207ms
26 KB
—
€1/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
189ms
159 KB
53%
€1/mo
Optional
cc.cdn.civiccomputing.com
cc.cdn.civiccomputing.com
Other
188ms
123 KB
47%
€1/mo
Optional
www.project-syndicate.org
www.project-syndicate.org
Other
164ms
160 KB
75%
€1/mo
Optional
Hotjar
script.hotjar.com
Session Replay
147ms
57 KB
67%
€1/mo
Optional
js.monitor.azure.com
js.monitor.azure.com
Other
107ms
46 KB
—
€1/mo
Optional
www.project-syndicate.org
Other
Costly
Execution655ms
Transfer55 KB
Monthly Cost€3/mo
Unattributable
Other
Costly
Execution305ms
Transfer0 KB
Monthly Cost€2/mo
ajax.googleapis.com
Other
Costly
Execution300ms
Transfer30 KB
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Costly
Execution226ms
Transfer157 KB
Unused41%
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Costly
Execution222ms
Transfer171 KB
Unused42%
Monthly Cost€1/mo
Microsoft Clarity
Session Replay
Costly
Execution207ms
Transfer26 KB
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution189ms
Transfer159 KB
Unused53%
Monthly Cost€1/mo
cc.cdn.civiccomputing.com
Other
Optional
Execution188ms
Transfer123 KB
Unused47%
Monthly Cost€1/mo
www.project-syndicate.org
Other
Optional
Execution164ms
Transfer160 KB
Unused75%
Monthly Cost€1/mo
Hotjar
Session Replay
Optional
Execution147ms
Transfer57 KB
Unused67%
Monthly Cost€1/mo
js.monitor.azure.com
Other
Optional
Execution107ms
Transfer46 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.project-syndicate.org adds 655ms and costs ~€3/month
Unattributable adds 305ms and costs ~€2/month
ajax.googleapis.com adds 300ms and costs ~€2/month
Google Tag Manager adds 226ms and costs ~€1/month
Google Tag Manager adds 222ms and costs ~€1/month
Microsoft Clarity adds 207ms 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.project-syndicate.org takes 655ms 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 305ms 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
ajax.googleapis.com takes 300ms 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
Google Tag Manager takes 226ms 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
Google Tag Manager takes 222ms 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
Microsoft Clarity takes 207ms 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
53% 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
75% of www.project-syndicate.org'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 Hotjar'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.