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.
B
Image Optimization
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Info::
✓
All images are well-optimized
20images231 KB
0oversized-0 KB
17legacy format
0missing dimensionsCLS risk
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
1 fonts (8 KB)
PASS
1 fonts (8 KB)
Info::
i
1 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
1
8 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
gAA8AAAAAT7QAAB+CAAEAAA...woff2swap
Size8 KB
Load time389 ms
Start1.0 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—
preload
2
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
93 requests over 8658ms
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-party24203ms · 2675KB · €128/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.uniqlo.com
www.uniqlo.com
Other
5189ms
164 KB
—
€28/mo
Costly
www.uniqlo.com
www.uniqlo.com
Other
3562ms
226 KB
78%
€19/mo
Costly
www.uniqlo.com
www.uniqlo.com
Other
2399ms
229 KB
61%
€13/mo
Costly
www.uniqlo.com
www.uniqlo.com
Other
2014ms
223 KB
—
€11/mo
Costly
www.uniqlo.com
www.uniqlo.com
Other
1933ms
155 KB
21%
€10/mo
Costly
Unattributable
Unattributable
Other
1903ms
0 KB
—
€10/mo
Costly
www.uniqlo.com
www.uniqlo.com
Other
1428ms
1 KB
21%
€8/mo
Costly
www.uniqlo.com
www.uniqlo.com
Other
1073ms
65 KB
33%
€6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
609ms
172 KB
40%
€3/mo
Costly
OneTrust
cdn.cookielaw.org
Consent
582ms
111 KB
54%
€3/mo
Essential
s.go-mpulse.net
s.go-mpulse.net
Other
522ms
60 KB
38%
€3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
498ms
136 KB
50%
€3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
433ms
180 KB
30%
€2/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
263ms
129 KB
50%
€1/mo
Costly
beacon.riskified.com
beacon.riskified.com
Other
257ms
18 KB
—
€1/mo
Costly
www.uniqlo.com
www.uniqlo.com
Other
213ms
226 KB
75%
€1/mo
Costly
www.uniqlo.com
www.uniqlo.com
Other
185ms
207 KB
80%
€1/mo
Optional
www.uniqlo.com
www.uniqlo.com
Other
171ms
9 KB
—
€1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
153ms
84 KB
63%
€1/mo
Optional
www.uniqlo.com
www.uniqlo.com
Other
150ms
56 KB
60%
€1/mo
Optional
www.uniqlo.com
www.uniqlo.com
Other
138ms
16 KB
—
€1/mo
Optional
www.uniqlo.com
www.uniqlo.com
Other
122ms
2 KB
—
€1/mo
Optional
www.uniqlo.com
www.uniqlo.com
Other
98ms
54 KB
40%
€1/mo
Optional
www.uniqlo.com
www.uniqlo.com
Other
96ms
8 KB
—
€1/mo
Optional
www.uniqlo.com
www.uniqlo.com
Other
77ms
101 KB
—
€0/mo
Optional
OneTrust
cdn.cookielaw.org
Consent
70ms
9 KB
—
€0/mo
Essential
www.uniqlo.com
www.uniqlo.com
Other
64ms
34 KB
—
€0/mo
Optional
www.uniqlo.com
Other
Costly
Execution5189ms
Transfer164 KB
Monthly Cost€28/mo
www.uniqlo.com
Other
Costly
Execution3562ms
Transfer226 KB
Unused78%
Monthly Cost€19/mo
www.uniqlo.com
Other
Costly
Execution2399ms
Transfer229 KB
Unused61%
Monthly Cost€13/mo
www.uniqlo.com
Other
Costly
Execution2014ms
Transfer223 KB
Monthly Cost€11/mo
www.uniqlo.com
Other
Costly
Execution1933ms
Transfer155 KB
Unused21%
Monthly Cost€10/mo
Unattributable
Other
Costly
Execution1903ms
Transfer0 KB
Monthly Cost€10/mo
www.uniqlo.com
Other
Costly
Execution1428ms
Transfer1 KB
Unused21%
Monthly Cost€8/mo
www.uniqlo.com
Other
Costly
Execution1073ms
Transfer65 KB
Unused33%
Monthly Cost€6/mo
Google Tag Manager
Tag Manager
Costly
Execution609ms
Transfer172 KB
Unused40%
Monthly Cost€3/mo
OneTrust
Consent
Essential
Execution582ms
Transfer111 KB
Unused54%
Monthly Cost€3/mo
s.go-mpulse.net
Other
Costly
Execution522ms
Transfer60 KB
Unused38%
Monthly Cost€3/mo
Google Tag Manager
Tag Manager
Costly
Execution498ms
Transfer136 KB
Unused50%
Monthly Cost€3/mo
Google Tag Manager
Tag Manager
Costly
Execution433ms
Transfer180 KB
Unused30%
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Costly
Execution263ms
Transfer129 KB
Unused50%
Monthly Cost€1/mo
beacon.riskified.com
Other
Costly
Execution257ms
Transfer18 KB
Monthly Cost€1/mo
www.uniqlo.com
Other
Costly
Execution213ms
Transfer226 KB
Unused75%
Monthly Cost€1/mo
www.uniqlo.com
Other
Optional
Execution185ms
Transfer207 KB
Unused80%
Monthly Cost€1/mo
www.uniqlo.com
Other
Optional
Execution171ms
Transfer9 KB
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution153ms
Transfer84 KB
Unused63%
Monthly Cost€1/mo
www.uniqlo.com
Other
Optional
Execution150ms
Transfer56 KB
Unused60%
Monthly Cost€1/mo
www.uniqlo.com
Other
Optional
Execution138ms
Transfer16 KB
Monthly Cost€1/mo
www.uniqlo.com
Other
Optional
Execution122ms
Transfer2 KB
Monthly Cost€1/mo
www.uniqlo.com
Other
Optional
Execution98ms
Transfer54 KB
Unused40%
Monthly Cost€1/mo
www.uniqlo.com
Other
Optional
Execution96ms
Transfer8 KB
Monthly Cost€1/mo
www.uniqlo.com
Other
Optional
Execution77ms
Transfer101 KB
Monthly Cost€0/mo
OneTrust
Consent
Essential
Execution70ms
Transfer9 KB
Monthly Cost€0/mo
www.uniqlo.com
Other
Optional
Execution64ms
Transfer34 KB
Monthly Cost€0/mo
These scripts may cost more than they're worth
www.uniqlo.com adds 5189ms and costs ~€28/month
www.uniqlo.com adds 3562ms and costs ~€19/month
www.uniqlo.com adds 2399ms and costs ~€13/month
www.uniqlo.com adds 2014ms and costs ~€11/month
www.uniqlo.com adds 1933ms and costs ~€10/month
Unattributable adds 1903ms and costs ~€10/month
www.uniqlo.com adds 1428ms and costs ~€8/month
www.uniqlo.com adds 1073ms and costs ~€6/month
Google Tag Manager adds 609ms and costs ~€3/month
s.go-mpulse.net adds 522ms and costs ~€3/month
Google Tag Manager adds 498ms and costs ~€3/month
Google Tag Manager adds 433ms and costs ~€2/month
Google Tag Manager adds 263ms and costs ~€1/month
beacon.riskified.com adds 257ms and costs ~€1/month
www.uniqlo.com adds 213ms and costs ~€1/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.uniqlo.com takes 5189ms 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.uniqlo.com takes 3562ms 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
78% of www.uniqlo.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.uniqlo.com takes 2399ms 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.uniqlo.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.uniqlo.com takes 2014ms 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.uniqlo.com takes 1933ms 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 1903ms 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.uniqlo.com takes 1428ms 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.uniqlo.com takes 1073ms 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 609ms 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
54% 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
s.go-mpulse.net takes 522ms 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 498ms 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
50% 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
Google Tag Manager takes 433ms 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 263ms 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
beacon.riskified.com 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
www.uniqlo.com takes 213ms 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 www.uniqlo.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
80% of www.uniqlo.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
63% 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 www.uniqlo.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.