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
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
Image Optimization
16 images, 0 KB saveable
PASS
16 images, 0 KB saveable
Info::
✓
All images are well-optimized
16images1.5 MB
0oversized-0 KB
3legacy format
0missing dimensionsCLS risk
A+
Font Loading
1 fonts (47 KB)
PASS
1 fonts (47 KB)
Info::
i
1 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
1
47 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
UcC73FwrK3iLTeHuS_nVMrM...woff2swap
Size47 KB
Load time15 ms
Start721 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)
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
10 hints, 0 missing preconnects
PASS
10 hints, 0 missing preconnects
Info::
✓
Page uses 10 resource hint(s)
Current Resource Hints
preconnect—
preload
6
dns-prefetch
4
prefetch—
10 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
61 requests over 2745ms
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-party11777ms · 973KB · $156/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.nielsen.com
www.nielsen.com
Other
5881ms
154 KB
51%
$78/mo
Costly
www.nielsen.com
www.nielsen.com
Other
1181ms
61 KB
—
$16/mo
Costly
Unattributable
Unattributable
Other
1087ms
0 KB
—
$14/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
1000ms
200 KB
33%
$13/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
600ms
171 KB
41%
$8/mo
Costly
OneTrust
cdn.cookielaw.org
Consent
575ms
129 KB
53%
$8/mo
Essential
jsDelivr
cdn.jsdelivr.net
CDN
553ms
17 KB
—
$7/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
238ms
117 KB
53%
$3/mo
Costly
unpkg
unpkg.com
CDN
165ms
5 KB
—
$2/mo
Optional
cdn.weglot.com
cdn.weglot.com
Other
143ms
71 KB
60%
$2/mo
Optional
OneTrust
cdn.cookielaw.org
Consent
140ms
6 KB
—
$2/mo
Essential
cdnjs
cdnjs.cloudflare.com
CDN
86ms
28 KB
—
$1/mo
Optional
s0.wp.com
s0.wp.com
Other
68ms
6 KB
—
$1/mo
Optional
OneTrust
cdn.cookielaw.org
Consent
61ms
9 KB
—
$1/mo
Essential
www.nielsen.com
Other
Costly
Execution5881ms
Transfer154 KB
Unused51%
Monthly Cost$78/mo
www.nielsen.com
Other
Costly
Execution1181ms
Transfer61 KB
Monthly Cost$16/mo
Unattributable
Other
Costly
Execution1087ms
Transfer0 KB
Monthly Cost$14/mo
Google Tag Manager
Tag Manager
Costly
Execution1000ms
Transfer200 KB
Unused33%
Monthly Cost$13/mo
Google Tag Manager
Tag Manager
Costly
Execution600ms
Transfer171 KB
Unused41%
Monthly Cost$8/mo
OneTrust
Consent
Essential
Execution575ms
Transfer129 KB
Unused53%
Monthly Cost$8/mo
jsDelivr
CDN
Costly
Execution553ms
Transfer17 KB
Monthly Cost$7/mo
Google Tag Manager
Tag Manager
Costly
Execution238ms
Transfer117 KB
Unused53%
Monthly Cost$3/mo
unpkg
CDN
Optional
Execution165ms
Transfer5 KB
Monthly Cost$2/mo
cdn.weglot.com
Other
Optional
Execution143ms
Transfer71 KB
Unused60%
Monthly Cost$2/mo
OneTrust
Consent
Essential
Execution140ms
Transfer6 KB
Monthly Cost$2/mo
cdnjs
CDN
Optional
Execution86ms
Transfer28 KB
Monthly Cost$1/mo
s0.wp.com
Other
Optional
Execution68ms
Transfer6 KB
Monthly Cost$1/mo
OneTrust
Consent
Essential
Execution61ms
Transfer9 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
www.nielsen.com adds 5881ms and costs ~$78/month
www.nielsen.com adds 1181ms and costs ~$16/month
Unattributable adds 1087ms and costs ~$14/month
Google Tag Manager adds 1000ms and costs ~$13/month
Google Tag Manager adds 600ms and costs ~$8/month
jsDelivr adds 553ms and costs ~$7/month
Google Tag Manager adds 238ms 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.nielsen.com takes 5881ms 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
51% of www.nielsen.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
www.nielsen.com takes 1181ms 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 1087ms 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 1000ms 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 600ms 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
jsDelivr takes 553ms 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 238ms 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
60% of cdn.weglot.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.