https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/09/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2026/02/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/04/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/themes/criteo201... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://tree-nation.com/images/tracking/label-co2-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2024/05/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2024/01/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.criteo.com/wp-content/uploads/2025/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
67images2.0 MB
0oversized-0 KB
56legacy format
22missing 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
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
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
10 fonts (768 KB)
PASS
10 fonts (768 KB)
Info::
i
10 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
10
768 KB total
Render-blocking
0
of 10
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
Mona-Sans-RegularWide.woffwoffswap
Size22 KB
Load time12 ms
Start45 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Graphik-Regular-Cy-Web....woff2swap
Size43 KB
Load time10 ms
Start46 ms
RiskFOUT — text flashes from fallback to web font
Graphik-Medium-Cy-Web.w...woff2swap
Size47 KB
Load time39 ms
Start47 ms
RiskFOUT — text flashes from fallback to web font
Graphik-Semibold-Cy-Web...woff2swap
Size48 KB
Load time16 ms
Start47 ms
RiskFOUT — text flashes from fallback to web font
fa-solid-900.woff2woff2swap
Size139 KB
Load time50 ms
Start48 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
fa-brands-400.woff2woff2swap
Size137 KB
Load time35 ms
Start49 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
fa-brands-400.woffwoffswap
Size160 KB
Load time28 ms
Start269 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-brands-400.ttfttfswap
Size90 KB
Load time17 ms
Start347 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
fa-brands-400.woff2woff2swap
Size76 KB
Load time68 ms
Start473 ms
RiskFOUT — text flashes from fallback to web font
x-font-woff;charset=utf...woffswap
Size8 KB
Load time42 ms
Start2.5 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
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 ~302 KB and ~604 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
9 hints, 0 missing preconnects
PASS
9 hints, 0 missing preconnects
Info::
✓
Page uses 9 resource hint(s)
Current Resource Hints
preconnect—
preload
7
dns-prefetch
2
prefetch—
9 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
A
HTTP Caching
max-age=86400 (1 day)
PASS
max-age=86400 (1 day)
Info::
✓
Cache-Control header is set
Got: public, max-age=86400
Info::
✓
Effective TTL: 1 day (max-age=86400)
Info::
i
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
public, max-age=86400
Directive
Value
Meaning
public
—
Any cache may store this response
max-age
86400
Cache for 1 day
Effective TTL: 86400 seconds
Network Waterfall
183 requests over 4051ms
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-party21104ms · 1549KB · $280/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.criteo.com
www.criteo.com
Other
9053ms
19 KB
—
$120/mo
Costly
www.criteo.com
www.criteo.com
Other
2167ms
85 KB
—
$29/mo
Costly
Unattributable
Unattributable
Other
1942ms
0 KB
—
$26/mo
Costly
www.criteo.com
www.criteo.com
Other
1918ms
31 KB
—
$25/mo
Costly
fast.wistia.com
fast.wistia.com
Other
1263ms
147 KB
46%
$17/mo
Costly
fast.wistia.net
fast.wistia.net
Other
1027ms
159 KB
52%
$14/mo
Costly
www.criteo.com
www.criteo.com
Other
626ms
35 KB
—
$8/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
536ms
176 KB
38%
$7/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
480ms
194 KB
38%
$6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
379ms
146 KB
44%
$5/mo
Costly
fast.wistia.com
fast.wistia.com
Other
378ms
55 KB
—
$5/mo
Costly
web.cmp.usercentrics.eu
web.cmp.usercentrics.eu
Other
269ms
56 KB
64%
$4/mo
Costly
www.criteo.com
www.criteo.com
Other
246ms
54 KB
55%
$3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
236ms
129 KB
48%
$3/mo
Costly
js-agent.newrelic.com
js-agent.newrelic.com
Other
181ms
27 KB
—
$2/mo
Optional
cdn.drda.io
cdn.drda.io
Other
151ms
35 KB
—
$2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
108ms
175 KB
64%
$1/mo
Optional
www.criteo.com
www.criteo.com
Other
72ms
6 KB
—
$1/mo
Optional
web.cmp.usercentrics.eu
web.cmp.usercentrics.eu
Other
70ms
18 KB
—
$1/mo
Optional
www.criteo.com
Other
Costly
Execution9053ms
Transfer19 KB
Monthly Cost$120/mo
www.criteo.com
Other
Costly
Execution2167ms
Transfer85 KB
Monthly Cost$29/mo
Unattributable
Other
Costly
Execution1942ms
Transfer0 KB
Monthly Cost$26/mo
www.criteo.com
Other
Costly
Execution1918ms
Transfer31 KB
Monthly Cost$25/mo
fast.wistia.com
Other
Costly
Execution1263ms
Transfer147 KB
Unused46%
Monthly Cost$17/mo
fast.wistia.net
Other
Costly
Execution1027ms
Transfer159 KB
Unused52%
Monthly Cost$14/mo
www.criteo.com
Other
Costly
Execution626ms
Transfer35 KB
Monthly Cost$8/mo
Google Tag Manager
Tag Manager
Costly
Execution536ms
Transfer176 KB
Unused38%
Monthly Cost$7/mo
Google Tag Manager
Tag Manager
Costly
Execution480ms
Transfer194 KB
Unused38%
Monthly Cost$6/mo
Google Tag Manager
Tag Manager
Costly
Execution379ms
Transfer146 KB
Unused44%
Monthly Cost$5/mo
fast.wistia.com
Other
Costly
Execution378ms
Transfer55 KB
Monthly Cost$5/mo
web.cmp.usercentrics.eu
Other
Costly
Execution269ms
Transfer56 KB
Unused64%
Monthly Cost$4/mo
www.criteo.com
Other
Costly
Execution246ms
Transfer54 KB
Unused55%
Monthly Cost$3/mo
Google Tag Manager
Tag Manager
Costly
Execution236ms
Transfer129 KB
Unused48%
Monthly Cost$3/mo
js-agent.newrelic.com
Other
Optional
Execution181ms
Transfer27 KB
Monthly Cost$2/mo
cdn.drda.io
Other
Optional
Execution151ms
Transfer35 KB
Monthly Cost$2/mo
Google Tag Manager
Tag Manager
Optional
Execution108ms
Transfer175 KB
Unused64%
Monthly Cost$1/mo
www.criteo.com
Other
Optional
Execution72ms
Transfer6 KB
Monthly Cost$1/mo
web.cmp.usercentrics.eu
Other
Optional
Execution70ms
Transfer18 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
www.criteo.com adds 9053ms and costs ~$120/month
www.criteo.com adds 2167ms and costs ~$29/month
Unattributable adds 1942ms and costs ~$26/month
www.criteo.com adds 1918ms and costs ~$25/month
fast.wistia.com adds 1263ms and costs ~$17/month
fast.wistia.net adds 1027ms and costs ~$14/month
www.criteo.com adds 626ms and costs ~$8/month
Google Tag Manager adds 536ms and costs ~$7/month
Google Tag Manager adds 480ms and costs ~$6/month
Google Tag Manager adds 379ms and costs ~$5/month
fast.wistia.com adds 378ms and costs ~$5/month
web.cmp.usercentrics.eu adds 269ms and costs ~$4/month
www.criteo.com adds 246ms and costs ~$3/month
Google Tag Manager adds 236ms 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.criteo.com takes 9053ms 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.criteo.com takes 2167ms 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 1942ms 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.criteo.com takes 1918ms 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
fast.wistia.com takes 1263ms 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
fast.wistia.net takes 1027ms 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 fast.wistia.net'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.criteo.com takes 626ms 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 536ms 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 480ms 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 379ms 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
fast.wistia.com takes 378ms 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
web.cmp.usercentrics.eu takes 269ms 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
64% of web.cmp.usercentrics.eu'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.criteo.com takes 246ms 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
55% of www.criteo.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
Google Tag Manager takes 236ms 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
64% 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.