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
93 images, 0 KB saveable
REVIEW
93 images, 0 KB saveable
Warning::
!
https://img.alicdn.com/imgextra/i3/O1CN019ZD9nr1qO... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN01mBlmbJ1Od... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i2/O1CN01xQ9oJD1lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN018R1AKX21v... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i2/O1CN01o1uRkw1ZE... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN01MzSU641q5... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i3/O1CN015zeYu41Qt... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN01f6uz8d1zT... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN01fUkHqg1iY... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i2/O1CN014dBjIj1pN... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN0105rDyH1oQ... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN015cn3181my... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN01nLNLmY1Vt... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i3/O1CN01ZwiPEP1Kp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN01OFWNjm1bs... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i4/O1CN01kDJjqA1IQ... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://privacy-policy.truste.com/privacy-seal/sea... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i2/O1CN01fga8xn1e7... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN01HeC9oP28U... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i2/O1CN01O2L5Uq26x... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN01rQhAt925N... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i2/O1CN01bYc1m81Rr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i4/O1CN01pfTwUd1oU... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i3/O1CN01AQCWuH27i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i4/O1CN01CF3pCf1qF... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i4/O1CN01yNBFZK1Go... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i2/O1CN01KMyvUS1df... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i2/O1CN01clzba61Pi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i4/O1CN01tF0TPd21W... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i2/O1CN01YuYoVp20L... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://privacy-policy.truste.com/privacy-seal/sea... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i2/O1CN01ovdv0A26w... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN01xjRku11xR... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
93images1.6 MB
0oversized-0 KB
22legacy format
33missing 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
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
9 fonts (161 KB)
PASS
9 fonts (161 KB)
Info::
i
9 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
9
161 KB total
Render-blocking
0
of 9
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
KFOlCnqEu92Fr1MmEU9fBBc...woff2swap
Size11 KB
Load time32 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
oMMgfZMQthOryQo9n22dcuv...woff2swap
Size10 KB
Load time84 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
font_263210_j0iclb5xrye...woff2swap
Size9 KB
Load time98 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
d-6IYplOFocCacKzxwXSOFt...woff2swap
Size15 KB
Load time71 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
Hgo13k-tfSpn0qi1SFdUfZB...woff2swap
Size11 KB
Load time77 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
font_4165067_1fvq2c6mks...woff2swap
Size5 KB
Load time89 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
Ks_cVxiCiwUWVsFWFA3Bjn-...woff2swap
Size8 KB
Load time11 ms
Start4.1 s
RiskFOUT — text flashes from fallback to web font
NJ4vxlgWwWbEsv18dAhqnn-...woff2swap
Size3 KB
Load time10 ms
Start4.2 s
RiskFOUT — text flashes from fallback to web font
getttfswap
Size89 KB
Load time11 ms
Start4.5 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 ~27 KB and ~54 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
No optimization needed
PASS
No optimization needed
Info::
✓
No resource hint issues
Network Waterfall
226 requests over 8073ms
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-party4285ms · 2933KB · ¥211/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
g.alicdn.com
g.alicdn.com
Other
1093ms
1352 KB
59%
¥54/mo
Costly
www.alibabacloud.com
www.alibabacloud.com
Other
657ms
24 KB
—
¥32/mo
Costly
Unattributable
Unattributable
Other
569ms
0 KB
—
¥28/mo
Costly
g.alicdn.com
g.alicdn.com
Other
347ms
690 KB
67%
¥17/mo
Costly
g.alicdn.com
g.alicdn.com
Other
209ms
63 KB
39%
¥10/mo
Costly
g.alicdn.com
g.alicdn.com
Other
196ms
109 KB
—
¥10/mo
Optional
website.alcasset.com
website.alcasset.com
Other
192ms
11 KB
—
¥9/mo
Optional
cloud-assets.alicdn.com
cloud-assets.alicdn.com
Other
162ms
117 KB
53%
¥8/mo
Optional
website.alcasset.com
website.alcasset.com
Other
133ms
29 KB
—
¥7/mo
Optional
g.alicdn.com
g.alicdn.com
Other
120ms
78 KB
49%
¥6/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
112ms
145 KB
38%
¥6/mo
Optional
consent.trustarc.com
consent.trustarc.com
Other
107ms
14 KB
—
¥5/mo
Optional
g.alicdn.com
g.alicdn.com
Other
78ms
31 KB
—
¥4/mo
Optional
g.alicdn.com
g.alicdn.com
Other
70ms
6 KB
—
¥3/mo
Optional
website.alcasset.com
website.alcasset.com
Other
69ms
157 KB
49%
¥3/mo
Optional
accounts.google.com
accounts.google.com
Other
63ms
96 KB
73%
¥3/mo
Optional
website.alcasset.com
website.alcasset.com
Other
57ms
0 KB
40%
¥3/mo
Optional
assets.alicdn.com
assets.alicdn.com
Other
51ms
10 KB
—
¥3/mo
Optional
g.alicdn.com
Other
Costly
Execution1093ms
Transfer1352 KB
Unused59%
Monthly Cost¥54/mo
www.alibabacloud.com
Other
Costly
Execution657ms
Transfer24 KB
Monthly Cost¥32/mo
Unattributable
Other
Costly
Execution569ms
Transfer0 KB
Monthly Cost¥28/mo
g.alicdn.com
Other
Costly
Execution347ms
Transfer690 KB
Unused67%
Monthly Cost¥17/mo
g.alicdn.com
Other
Costly
Execution209ms
Transfer63 KB
Unused39%
Monthly Cost¥10/mo
g.alicdn.com
Other
Optional
Execution196ms
Transfer109 KB
Monthly Cost¥10/mo
website.alcasset.com
Other
Optional
Execution192ms
Transfer11 KB
Monthly Cost¥9/mo
cloud-assets.alicdn.com
Other
Optional
Execution162ms
Transfer117 KB
Unused53%
Monthly Cost¥8/mo
website.alcasset.com
Other
Optional
Execution133ms
Transfer29 KB
Monthly Cost¥7/mo
g.alicdn.com
Other
Optional
Execution120ms
Transfer78 KB
Unused49%
Monthly Cost¥6/mo
Google Tag Manager
Tag Manager
Optional
Execution112ms
Transfer145 KB
Unused38%
Monthly Cost¥6/mo
consent.trustarc.com
Other
Optional
Execution107ms
Transfer14 KB
Monthly Cost¥5/mo
g.alicdn.com
Other
Optional
Execution78ms
Transfer31 KB
Monthly Cost¥4/mo
g.alicdn.com
Other
Optional
Execution70ms
Transfer6 KB
Monthly Cost¥3/mo
website.alcasset.com
Other
Optional
Execution69ms
Transfer157 KB
Unused49%
Monthly Cost¥3/mo
accounts.google.com
Other
Optional
Execution63ms
Transfer96 KB
Unused73%
Monthly Cost¥3/mo
website.alcasset.com
Other
Optional
Execution57ms
Transfer0 KB
Unused40%
Monthly Cost¥3/mo
assets.alicdn.com
Other
Optional
Execution51ms
Transfer10 KB
Monthly Cost¥3/mo
These scripts may cost more than they're worth
g.alicdn.com adds 1093ms and costs ~¥54/month
www.alibabacloud.com adds 657ms and costs ~¥32/month
Unattributable adds 569ms and costs ~¥28/month
g.alicdn.com adds 347ms and costs ~¥17/month
g.alicdn.com adds 209ms and costs ~¥10/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
g.alicdn.com takes 1093ms 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
59% of g.alicdn.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.alibabacloud.com takes 657ms 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 569ms 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
g.alicdn.com takes 347ms 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
67% of g.alicdn.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
g.alicdn.com takes 209ms 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 cloud-assets.alicdn.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
73% of accounts.google.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.
1.2 s
3.5 s
4.6 s
5.8 s
6.9 s
8.1 s
9.3 s