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
28 images, 0 KB saveable
REVIEW
28 images, 0 KB saveable
Warning::
!
https://cdn.wfp.org/guides/ui/assets/v0.0.1/logos/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.wfp.org/guides/ui/assets/v0.0.1/logos/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
28images1.2 MB
0oversized-0 KB
24legacy format
2missing 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
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
2 fonts (80 KB)
PASS
2 fonts (80 KB)
Info::
i
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
80 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
woff2;base64,d09GMgABAA...woff2swap
Size38 KB
Load time70 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX...woff2swap
Size42 KB
Load time6 ms
Start1.3 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
✓
Page uses 2 resource hint(s)
Current Resource Hints
preconnect
2
preload—
dns-prefetch—
prefetch—
2 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
76 requests over 3279ms
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-party9375ms · 1603KB · €102/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
Google Tag Manager
www.googletagmanager.com
Tag Manager
2397ms
184 KB
33%
€26/mo
Costly
www.wfp.org
www.wfp.org
Other
1729ms
107 KB
61%
€19/mo
Costly
Unattributable
Unattributable
Other
1236ms
0 KB
—
€13/mo
Costly
www.wfp.org
www.wfp.org
Other
867ms
16 KB
—
€9/mo
Costly
OneTrust
cdn.cookielaw.org
Consent
567ms
124 KB
53%
€6/mo
Essential
Google Tag Manager
www.googletagmanager.com
Tag Manager
394ms
173 KB
41%
€4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
387ms
174 KB
41%
€4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
348ms
137 KB
43%
€4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
272ms
138 KB
43%
€3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
266ms
137 KB
47%
€3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
257ms
129 KB
48%
€3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
234ms
134 KB
48%
€3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
220ms
126 KB
48%
€2/mo
Costly
OneTrust
cdn.cookielaw.org
Consent
151ms
9 KB
—
€2/mo
Essential
Bing UET
bat.bing.com
Advertising
51ms
15 KB
—
€1/mo
Optional
Google Tag Manager
Tag Manager
Costly
Execution2397ms
Transfer184 KB
Unused33%
Monthly Cost€26/mo
www.wfp.org
Other
Costly
Execution1729ms
Transfer107 KB
Unused61%
Monthly Cost€19/mo
Unattributable
Other
Costly
Execution1236ms
Transfer0 KB
Monthly Cost€13/mo
www.wfp.org
Other
Costly
Execution867ms
Transfer16 KB
Monthly Cost€9/mo
OneTrust
Consent
Essential
Execution567ms
Transfer124 KB
Unused53%
Monthly Cost€6/mo
Google Tag Manager
Tag Manager
Costly
Execution394ms
Transfer173 KB
Unused41%
Monthly Cost€4/mo
Google Tag Manager
Tag Manager
Costly
Execution387ms
Transfer174 KB
Unused41%
Monthly Cost€4/mo
Google Tag Manager
Tag Manager
Costly
Execution348ms
Transfer137 KB
Unused43%
Monthly Cost€4/mo
Google Tag Manager
Tag Manager
Costly
Execution272ms
Transfer138 KB
Unused43%
Monthly Cost€3/mo
Google Tag Manager
Tag Manager
Costly
Execution266ms
Transfer137 KB
Unused47%
Monthly Cost€3/mo
Google Tag Manager
Tag Manager
Costly
Execution257ms
Transfer129 KB
Unused48%
Monthly Cost€3/mo
Google Tag Manager
Tag Manager
Costly
Execution234ms
Transfer134 KB
Unused48%
Monthly Cost€3/mo
Google Tag Manager
Tag Manager
Costly
Execution220ms
Transfer126 KB
Unused48%
Monthly Cost€2/mo
OneTrust
Consent
Essential
Execution151ms
Transfer9 KB
Monthly Cost€2/mo
Bing UET
Advertising
Optional
Execution51ms
Transfer15 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
Google Tag Manager adds 2397ms and costs ~€26/month
www.wfp.org adds 1729ms and costs ~€19/month
Unattributable adds 1236ms and costs ~€13/month
www.wfp.org adds 867ms and costs ~€9/month
Google Tag Manager adds 394ms and costs ~€4/month
Google Tag Manager adds 387ms and costs ~€4/month
Google Tag Manager adds 348ms and costs ~€4/month
Google Tag Manager adds 272ms and costs ~€3/month
Google Tag Manager adds 266ms and costs ~€3/month
Google Tag Manager adds 257ms and costs ~€3/month
Google Tag Manager adds 234ms and costs ~€3/month
Google Tag Manager 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
Google Tag Manager takes 2397ms 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.wfp.org takes 1729ms 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 www.wfp.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
Unattributable takes 1236ms 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.wfp.org takes 867ms 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 OneTrust'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 394ms 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 387ms 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 348ms 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 272ms 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 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
Google Tag Manager takes 257ms 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 234ms 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 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.