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
14 images, 0 KB saveable
PASS
14 images, 0 KB saveable
Warning::
!
https://www.gambleaware.org/media/3wslw2i4/gamble-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
14images448 KB
0oversized-0 KB
1legacy 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
A+
Font Loading
4 fonts (110 KB)
PASS
4 fonts (110 KB)
Info::
i
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
110 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size37 KB
Load time35 ms
Start366 ms
RiskFOUT — text flashes from fallback to web font
iconfont.woff2woff2swap
Size20 KB
Load time119 ms
Start366 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size28 KB
Load time17 ms
Start366 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size25 KB
Load time18 ms
Start367 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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
✓
Page uses 7 resource hint(s)
Current Resource Hints
preconnect
6
preload
1
dns-prefetch—
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
55 requests over 752ms
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-party1345ms · 358KB · €15/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
consent.cookiebot.com
consent.cookiebot.com
Other
364ms
36 KB
64%
€4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
233ms
162 KB
44%
€3/mo
Costly
Unattributable
Unattributable
Other
224ms
0 KB
—
€2/mo
Costly
www.gambleaware.org
www.gambleaware.org
Other
204ms
15 KB
—
€2/mo
Costly
www.gambleaware.org
www.gambleaware.org
Other
171ms
131 KB
63%
€2/mo
Optional
www.gambleaware.org
www.gambleaware.org
Other
78ms
2 KB
—
€1/mo
Optional
www.gambleaware.org
www.gambleaware.org
Other
71ms
13 KB
—
€1/mo
Optional
consent.cookiebot.com
Other
Costly
Execution364ms
Transfer36 KB
Unused64%
Monthly Cost€4/mo
Google Tag Manager
Tag Manager
Costly
Execution233ms
Transfer162 KB
Unused44%
Monthly Cost€3/mo
Unattributable
Other
Costly
Execution224ms
Transfer0 KB
Monthly Cost€2/mo
www.gambleaware.org
Other
Costly
Execution204ms
Transfer15 KB
Monthly Cost€2/mo
www.gambleaware.org
Other
Optional
Execution171ms
Transfer131 KB
Unused63%
Monthly Cost€2/mo
www.gambleaware.org
Other
Optional
Execution78ms
Transfer2 KB
Monthly Cost€1/mo
www.gambleaware.org
Other
Optional
Execution71ms
Transfer13 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
consent.cookiebot.com adds 364ms and costs ~€4/month
Google Tag Manager adds 233ms and costs ~€3/month
Unattributable adds 224ms and costs ~€2/month
www.gambleaware.org adds 204ms 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
consent.cookiebot.com takes 364ms 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 consent.cookiebot.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 233ms 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 224ms 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.gambleaware.org takes 204ms 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
63% of www.gambleaware.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.