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
54 images, 0 KB saveable
REVIEW
54 images, 0 KB saveable
Warning::
!
https://www.appsflyer.com/wp-content/uploads/2025/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.appsflyer.com/wp-content/uploads/2025/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.appsflyer.com/wp-content/uploads/2025/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.appsflyer.com/wp-content/uploads/2025/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.appsflyer.com/wp-content/uploads/2025/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.appsflyer.com/wp-content/uploads/2025/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.appsflyer.com/wp-content/uploads/2025/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.appsflyer.com/wp-content/uploads/2025/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.appsflyer.com/wp-content/uploads/2020/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.appsflyer.com/wp-content/uploads/2025/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.appsflyer.com/wp-content/uploads/2025/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.appsflyer.com/wp-content/uploads/2020/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
54images5.9 MB
0oversized-0 KB
25legacy format
12missing 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
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
4 fonts (993 KB)
PASS
4 fonts (993 KB)
Info::
i
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
993 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
Inter-VariableFont_opsz...ttfswap
Size855 KB
Load time100 ms
Start1.4 s
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
PPFormula-SemiExtendedS...woff2swap
Size46 KB
Load time101 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
PPFormula-SemiExtendedR...woff2swap
Size46 KB
Load time102 ms
Start1.4 s
RiskFOUT — text flashes from fallback to web font
PPFormula-SemiExtendedM...woff2swap
Size46 KB
Load time104 ms
Start1.4 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)
Fixing the unchecked items could save ~684 KB and ~1368 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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
✓
Page uses 4 resource hint(s)
Current Resource Hints
preconnect—
preload—
dns-prefetch
4
prefetch—
4 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
143 requests over 2936ms
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-party4998ms · 1085KB · $86/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
Unattributable
Unattributable
Other
2188ms
0 KB
—
$38/mo
Costly
www.appsflyer.com
www.appsflyer.com
Other
424ms
0 KB
—
$7/mo
Costly
fast.wistia.com
fast.wistia.com
Other
391ms
162 KB
75%
$7/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
327ms
181 KB
33%
$6/mo
Costly
www.appsflyer.com
www.appsflyer.com
Other
296ms
9 KB
—
$5/mo
Costly
www.appsflyer.com
www.appsflyer.com
Other
260ms
25 KB
—
$4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
235ms
166 KB
39%
$4/mo
Costly
OneTrust
cdn.cookielaw.org
Consent
205ms
105 KB
53%
$4/mo
Essential
Google Tag Manager
www.googletagmanager.com
Tag Manager
197ms
145 KB
42%
$3/mo
Optional
www.appsflyer.com
www.appsflyer.com
Other
93ms
58 KB
82%
$2/mo
Optional
go.appsflyer.com
go.appsflyer.com
Other
88ms
68 KB
76%
$2/mo
Optional
OneTrust
cdn.cookielaw.org
Consent
73ms
9 KB
—
$1/mo
Essential
www.appsflyer.com
www.appsflyer.com
Other
64ms
3 KB
—
$1/mo
Optional
www.appsflyer.com
www.appsflyer.com
Other
54ms
2 KB
—
$1/mo
Optional
www.appsflyer.com
www.appsflyer.com
Other
53ms
31 KB
69%
$1/mo
Optional
www.appsflyer.com
www.appsflyer.com
Other
50ms
122 KB
—
$1/mo
Optional
Unattributable
Other
Costly
Execution2188ms
Transfer0 KB
Monthly Cost$38/mo
www.appsflyer.com
Other
Costly
Execution424ms
Transfer0 KB
Monthly Cost$7/mo
fast.wistia.com
Other
Costly
Execution391ms
Transfer162 KB
Unused75%
Monthly Cost$7/mo
Google Tag Manager
Tag Manager
Costly
Execution327ms
Transfer181 KB
Unused33%
Monthly Cost$6/mo
www.appsflyer.com
Other
Costly
Execution296ms
Transfer9 KB
Monthly Cost$5/mo
www.appsflyer.com
Other
Costly
Execution260ms
Transfer25 KB
Monthly Cost$4/mo
Google Tag Manager
Tag Manager
Costly
Execution235ms
Transfer166 KB
Unused39%
Monthly Cost$4/mo
OneTrust
Consent
Essential
Execution205ms
Transfer105 KB
Unused53%
Monthly Cost$4/mo
Google Tag Manager
Tag Manager
Optional
Execution197ms
Transfer145 KB
Unused42%
Monthly Cost$3/mo
www.appsflyer.com
Other
Optional
Execution93ms
Transfer58 KB
Unused82%
Monthly Cost$2/mo
go.appsflyer.com
Other
Optional
Execution88ms
Transfer68 KB
Unused76%
Monthly Cost$2/mo
OneTrust
Consent
Essential
Execution73ms
Transfer9 KB
Monthly Cost$1/mo
www.appsflyer.com
Other
Optional
Execution64ms
Transfer3 KB
Monthly Cost$1/mo
www.appsflyer.com
Other
Optional
Execution54ms
Transfer2 KB
Monthly Cost$1/mo
www.appsflyer.com
Other
Optional
Execution53ms
Transfer31 KB
Unused69%
Monthly Cost$1/mo
www.appsflyer.com
Other
Optional
Execution50ms
Transfer122 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
Unattributable adds 2188ms and costs ~$38/month
www.appsflyer.com adds 424ms and costs ~$7/month
fast.wistia.com adds 391ms and costs ~$7/month
Google Tag Manager adds 327ms and costs ~$6/month
www.appsflyer.com adds 296ms and costs ~$5/month
www.appsflyer.com adds 260ms and costs ~$4/month
Google Tag Manager adds 235ms and costs ~$4/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
Unattributable takes 2188ms 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.appsflyer.com takes 424ms 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 391ms 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
75% of fast.wistia.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 327ms 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.appsflyer.com takes 296ms 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.appsflyer.com takes 260ms 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 235ms 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
82% of www.appsflyer.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
76% of go.appsflyer.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
69% of www.appsflyer.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.