Consider code splitting or tree shaking to reduce unused code.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
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
3 fonts (21 KB)
PASS
3 fonts (21 KB)
Info::
i
3 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
3
21 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
marvelfont.woffwoffswap
Size5 KB
Load time340 ms
Start9.4 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
iconfont.78eb594e.ttfttfswap
Size13 KB
Load time87 ms
Start9.7 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
wAAAfgAAA…unknownswap
Size3 KB
Load time167 ms
Start10.9 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 ~6 KB and ~12 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
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
97 requests over 12618ms
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-party5152ms · 407KB · ¥254/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
m.weibo.cn
m.weibo.cn
Other
1922ms
3 KB
—
¥95/mo
Costly
h5.sinaimg.cn
h5.sinaimg.cn
Other
1347ms
35 KB
72%
¥66/mo
Costly
Unattributable
Unattributable
Other
933ms
0 KB
—
¥46/mo
Costly
h5.sinaimg.cn
h5.sinaimg.cn
Other
455ms
23 KB
—
¥22/mo
Costly
visitor.passport.weibo.cn
visitor.passport.weibo.cn
Other
269ms
16 KB
—
¥13/mo
Costly
h5.sinaimg.cn
h5.sinaimg.cn
Other
226ms
330 KB
67%
¥11/mo
Costly
m.weibo.cn
Other
Costly
Execution1922ms
Transfer3 KB
Monthly Cost¥95/mo
h5.sinaimg.cn
Other
Costly
Execution1347ms
Transfer35 KB
Unused72%
Monthly Cost¥66/mo
Unattributable
Other
Costly
Execution933ms
Transfer0 KB
Monthly Cost¥46/mo
h5.sinaimg.cn
Other
Costly
Execution455ms
Transfer23 KB
Monthly Cost¥22/mo
visitor.passport.weibo.cn
Other
Costly
Execution269ms
Transfer16 KB
Monthly Cost¥13/mo
h5.sinaimg.cn
Other
Costly
Execution226ms
Transfer330 KB
Unused67%
Monthly Cost¥11/mo
These scripts may cost more than they're worth
m.weibo.cn adds 1922ms and costs ~¥95/month
h5.sinaimg.cn adds 1347ms and costs ~¥66/month
Unattributable adds 933ms and costs ~¥46/month
h5.sinaimg.cn adds 455ms and costs ~¥22/month
visitor.passport.weibo.cn adds 269ms and costs ~¥13/month
h5.sinaimg.cn adds 226ms and costs ~¥11/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
m.weibo.cn takes 1922ms 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
h5.sinaimg.cn takes 1347ms 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
72% of h5.sinaimg.cn'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
Unattributable takes 933ms 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
h5.sinaimg.cn takes 455ms 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
visitor.passport.weibo.cn 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
h5.sinaimg.cn takes 226ms 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 h5.sinaimg.cn'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.