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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
31
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
71
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

4.09 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

15.12 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

2.00 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.003

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

9.08 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

20.64 s

Page Load Progression

522 ms
1.0 s
1.6 s
2.1 s
2.6 s
3.1 s
3.7 s
4.2 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.3 MB transferred, 120 requests
FIX
3.3 MB transferred, 120 requests
Warning::
Page weighs 9.3 MB (3.3 MB transferred)
Warning::
JavaScript is 2.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.1 MB
Warning::
120 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.69 g CO2 per page load
3.3 MB / 2.4 MB budget
3.3 MB transferred
120 requests
0.69 g CO2 per page load
JavaScript 2.1 MiB 65%
Images 983.2 KiB 29%
CSS 83.1 KiB 2%
Other 52.3 KiB 2%
HTML 28.0 KiB 1%
Fonts 17.7 KiB 1%
Other 2.1 KiB 0%
Other 421 B 0%
Other 89 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.3 MiB of 3.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
7180ms total JS execution
FIX
7180ms total JS execution
Warning::
https://static.zhihu.com/heifetz/mobile.app.b35ba6...: 1662ms CPU time
Warning::
https://static.zhihu.com/event/wza/4633_1/aria.js?...: 1023ms CPU time
Warning::
https://static.zhihu.com/event/react-dom@17.0.2/um...: 862ms CPU time
Warning::
Unattributable: 813ms CPU time
Warning::
https://www.zhihu.com/: 656ms CPU time
Warning::
Third-party scripts: 7180ms (100% of total)

Main Thread Breakdown

Script Evaluation 65% Script Parsing & Compilation 10% Other 10% Style & Layout 10%
ScriptTotalScriptingParse/CompileParty
https://static.zhihu.com/heifetz/mobile.app.b35ba6660342576655af.js1662ms1242ms155ms3rd
https://static.zhihu.com/event/wza/4633_1/aria.js?appid=c5ddb58ead4528987249d96fb27246ab1023ms930ms40ms3rd
https://static.zhihu.com/event/react-dom@17.0.2/umd/react-dom.production.min.js862ms750ms13ms3rd
Unattributable813ms244ms0ms3rd
https://www.zhihu.com/656ms27ms3ms3rd
https://unpkg.zhimg.com/@cfe/assets@1.5.1/dist/third-party/gtoneid-h5-simple-min.js601ms538ms16ms3rd
https://unpkg.zhimg.com/za-js-sdk@5.6.0/dist/zap.js576ms527ms33ms3rd
https://static.zhihu.com/heifetz/682.app.858f080ce596fa634bde.js421ms67ms333ms3rd
https://unpkg.zhimg.com/@cfe/sentry-script@1.3.1/dist/init.js381ms200ms4ms3rd
https://static.zhihu.com/heifetz/chunks/zswsdid.993bf3e63383befd3ad6.js184ms166ms8ms3rd
F
JS Bundles
Action
69 scripts, 1.0 MB unused
FIX
69 scripts, 1.0 MB unused
Warning::
https://static.zhihu.com/heifetz/682.app.858f080ce...: 551 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.zhihu.com/heifetz/mobile.app.b35ba6...: 234 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.zhihu.com/heifetz/chunks/shared-a7a...: 115 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.zhihu.com/event/wza/4633_1/aria.js?...: 85 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.zhihu.com/heifetz/chunks/shared-826...: 38 KB unused (93%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.0 MB
1056 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.zhihu.com/heifetz/682.app.858f080ce596fa634bde.js787 KB551 KB (71%)✓3rd
https://static.zhihu.com/heifetz/mobile.app.b35ba6660342576655af.js361 KB234 KB (66%)✓3rd
https://static.zhihu.com/heifetz/chunks/shared-a7a4a2d0093164b9d10e43fa748708c97cbfd9fe.68756e8818a7d751fad3.js144 KB115 KB (83%)✓3rd
https://static.zhihu.com/event/wza/4633_1/aria.js?appid=c5ddb58ead4528987249d96fb27246ab118 KB85 KB (73%)✓3rd
https://static.zhihu.com/heifetz/chunks/shared-826b84a0e8ebf4ad4125f3058df7b8d7c0b5bca4.9172b81f5ec9e991f398.js43 KB38 KB (93%)✓3rd
https://static.zhihu.com/heifetz/vendor.007c46aa2a2931497960.js67 KB32 KB (48%)✓3rd
https://unpkg.zhimg.com/za-js-sdk@5.6.0/dist/zap.js74 KB—✓3rd
https://static.zhihu.com/heifetz/chunks/lib-c4d1bd12.e06df5e16f45e5f90ed9.js9 KB—✓3rd
https://static.zhihu.com/event/react-dom@17.0.2/umd/react-dom-server.browser.production.min.js8 KB—✓3rd
https://static.zhihu.com/heifetz/runtime.app.cafe2cbeb5405865917a.js9 KB—✓3rd

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

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

F
Page Weight Inventory
Action
120 resources · 3.3 MB · 1.0 MB savings available
FIX
120 resources · 3.3 MB · 1.0 MB savings available
Warning::
Page weight 2.3 MB over 1MB target
Got: 3.3 MB Expected: ≤ 1 MB
Info::
~1.0 MB of savings available
Warning::
119 third-party resources (100% of weight)
Info::
4 resources over 200KB
120 resources · 3.3 MiB · 119 third-party 2.3 MiB over 1MB target
JavaScript 65% · 2.1 MiB
Image 29% · 985.1 KiB
CSS 2% · 83.1 KiB
Other 2% · 52.1 KiB
Document 1% · 28.9 KiB
Font 1% · 17.7 KiB

~1.0 MiB of savings available

Remove unused JavaScript: 1.0 MiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
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
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Info::
All images are well-optimized
11 images 983 KB
0 oversized -0 KB
10 legacy format
0 missing dimensions CLS 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 (18 KB)
PASS
1 fonts (18 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

18 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 4.1 s LCP 15.1 shttps://unpkg.zhimg.com/@cfe/font-misans@1.1.1/dist/fonts/subset-0.woff2subset-0.woff2 https://unpkg.zhimg.com/@cfe/font-misans@1.1.1/dist/fonts/subset-0.woff2 — 17.7 KiB — 7 ms — font-display: swap
subset-0.woff2 woff2 swap
Size 18 KB
Load time 7 ms
Start 2.5 s
Risk FOUT — 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
8 hints, 0 missing preconnects
PASS
8 hints, 0 missing preconnects
Info::
Page uses 8 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
8
prefetch
—

8 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
120 requests over 6003ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 4.1 s LCP 15.1 shttps://zhihu.com// https://zhihu.com/ — 301 — 266 B — 924 ms — h2https://www.zhihu.com/www.zhihu.com/ https://www.zhihu.com/ — 200 — 28.0 KiB — 463 ms — h2https://static.zhihu.com/heifetz/682.216a26f4.f353c954d14d936b0e49.cssstatic.zhihu.com/heifetz/682.216a26... https://static.zhihu.com/heifetz/682.216a26f4.f353c954d14d936b0e49.css — 200 — 27.0 KiB — 167 ms — h2https://static.zhihu.com/heifetz/mobile.216a26f4.de2862ffb5492dbe0149.cssstatic.zhihu.com/heifetz/mobile.216... https://static.zhihu.com/heifetz/mobile.216a26f4.de2862ffb5492dbe0149.css — 200 — 27.7 KiB — 156 ms — h2https://static.zhihu.com/heifetz/3064.216a26f4.e183ecf852807b6e9662.cssstatic.zhihu.com/heifetz/3064.216a2... https://static.zhihu.com/heifetz/3064.216a26f4.e183ecf852807b6e9662.css — 200 — 4.8 KiB — 180 ms — h2https://static.zhihu.com/heifetz/mobile-topstory-routes.216a26f4.14752a8bf1686f08d33b.cssstatic.zhihu.com/heifetz/mobile-top... https://static.zhihu.com/heifetz/mobile-topstory-routes.216a26f4.14752a8bf1686f08d33b.css — 200 — 15.0 KiB — 181 ms — h2https://pic1.zhimg.com/v2-45bd10426541b3d82bace746e8b5a53a.pngpic1.zhimg.com/v2-45bd10426541b3d82... https://pic1.zhimg.com/v2-45bd10426541b3d82bace746e8b5a53a.png — 200 — 5.5 KiB — 122 ms — h2https://static.zhihu.com/heifetz/vendor.007c46aa2a2931497960.jsstatic.zhihu.com/heifetz/vendor.007... https://static.zhihu.com/heifetz/vendor.007c46aa2a2931497960.js — 200 — 67.4 KiB — 201 ms — h2https://static.zhihu.com/event/react@17.0.2/umd/react.production.min.jsstatic.zhihu.com/event/react@17.0.2... https://static.zhihu.com/event/react@17.0.2/umd/react.production.min.js — 200 — 4.8 KiB — 55 ms — h2https://static.zhihu.com/event/react-dom@17.0.2/umd/react-dom.production.min.jsstatic.zhihu.com/event/react-dom@17... https://static.zhihu.com/event/react-dom@17.0.2/umd/react-dom.production.min.js — 200 — 39.5 KiB — 29 ms — h2https://static.zhihu.com/event/react-dom@17.0.2/umd/react-dom-server.browser.production.min.jsstatic.zhihu.com/event/react-dom@17... https://static.zhihu.com/event/react-dom@17.0.2/umd/react-dom-server.browser.production.min.js — 200 — 8.2 KiB — 53 ms — h2https://static.zhihu.com/heifetz/runtime.app.cafe2cbeb5405865917a.jsstatic.zhihu.com/heifetz/runtime.ap... https://static.zhihu.com/heifetz/runtime.app.cafe2cbeb5405865917a.js — 200 — 8.5 KiB — 57 ms — h2https://static.zhihu.com/heifetz/lib-29107295.app.42d07f814b7b05187671.jsstatic.zhihu.com/heifetz/lib-291072... https://static.zhihu.com/heifetz/lib-29107295.app.42d07f814b7b05187671.js — 200 — 25.7 KiB — 60 ms — h2https://static.zhihu.com/heifetz/lib-79b5cf47.app.8b6b6bf4b6d894db9b07.jsstatic.zhihu.com/heifetz/lib-79b5cf... https://static.zhihu.com/heifetz/lib-79b5cf47.app.8b6b6bf4b6d894db9b07.js — 200 — 16.6 KiB — 61 ms — h2https://static.zhihu.com/heifetz/lib-330004dc.app.3ce3c85480416707c78d.jsstatic.zhihu.com/heifetz/lib-330004... https://static.zhihu.com/heifetz/lib-330004dc.app.3ce3c85480416707c78d.js — 200 — 21.4 KiB — 69 ms — h2https://static.zhihu.com/heifetz/lib-fae4f1f9.app.2a53c780e75bf169b2e0.jsstatic.zhihu.com/heifetz/lib-fae4f1... https://static.zhihu.com/heifetz/lib-fae4f1f9.app.2a53c780e75bf169b2e0.js — 200 — 9.9 KiB — 123 ms — h2https://static.zhihu.com/heifetz/lib-f3572862.app.d99939034500fbfbe18d.jsstatic.zhihu.com/heifetz/lib-f35728... https://static.zhihu.com/heifetz/lib-f3572862.app.d99939034500fbfbe18d.js — 200 — 14.3 KiB — 73 ms — h2https://static.zhihu.com/heifetz/lib-0e5ce61e.app.70bf009ea05bade00289.jsstatic.zhihu.com/heifetz/lib-0e5ce6... https://static.zhihu.com/heifetz/lib-0e5ce61e.app.70bf009ea05bade00289.js — 200 — 17.1 KiB — 67 ms — h2https://static.zhihu.com/heifetz/lib-83b0f42f.app.1b8a0ab8fae9a888fb1b.jsstatic.zhihu.com/heifetz/lib-83b0f4... https://static.zhihu.com/heifetz/lib-83b0f42f.app.1b8a0ab8fae9a888fb1b.js — 200 — 10.8 KiB — 67 ms — h2https://static.zhihu.com/heifetz/682.app.858f080ce596fa634bde.jsstatic.zhihu.com/heifetz/682.app.85... https://static.zhihu.com/heifetz/682.app.858f080ce596fa634bde.js — 200 — 787.4 KiB — 147 ms — h2https://static.zhihu.com/heifetz/mobile.app.b35ba6660342576655af.jsstatic.zhihu.com/heifetz/mobile.app... https://static.zhihu.com/heifetz/mobile.app.b35ba6660342576655af.js — 200 — 361.5 KiB — 141 ms — h2https://static.zhihu.com/heifetz/chunks/lib-38cf5c11.55406d88a2ffaca6a652.jsstatic.zhihu.com/heifetz/chunks/lib... https://static.zhihu.com/heifetz/chunks/lib-38cf5c11.55406d88a2ffaca6a652.js — 200 — 13.5 KiB — 124 ms — h2https://static.zhihu.com/heifetz/chunks/lib-75fc9c18.fa82171dc3014b0aaa1d.jsstatic.zhihu.com/heifetz/chunks/lib... https://static.zhihu.com/heifetz/chunks/lib-75fc9c18.fa82171dc3014b0aaa1d.js — 200 — 19.5 KiB — 76 ms — h2https://static.zhihu.com/heifetz/chunks/lib-2ec050f6.d4f4e66eca62274c119a.jsstatic.zhihu.com/heifetz/chunks/lib... https://static.zhihu.com/heifetz/chunks/lib-2ec050f6.d4f4e66eca62274c119a.js — 200 — 15.7 KiB — 77 ms — h2https://static.zhihu.com/heifetz/chunks/lib-9b20c40c.d1f54ddead406a2077fa.jsstatic.zhihu.com/heifetz/chunks/lib... https://static.zhihu.com/heifetz/chunks/lib-9b20c40c.d1f54ddead406a2077fa.js — 200 — 13.4 KiB — 78 ms — h2https://static.zhihu.com/heifetz/chunks/shared-13fb42b4a7fcb1c962087d8d5646534f3cea2e86.8aa3129b95eb1a57cd37.jsstatic.zhihu.com/heifetz/chunks/sha... https://static.zhihu.com/heifetz/chunks/shared-13fb42b4a7fcb1c962087d8d5646534f3cea2e86.8aa3129b95eb1a57cd37.js — 200 — 34.4 KiB — 86 ms — h2https://static.zhihu.com/heifetz/chunks/shared-464f72db498db642b958eed9e954aa31ce9e5fd7.390bc51363856e98a529.jsstatic.zhihu.com/heifetz/chunks/sha... https://static.zhihu.com/heifetz/chunks/shared-464f72db498db642b958eed9e954aa31ce9e5fd7.390bc51363856e98a529.js — 200 — 16.1 KiB — 80 ms — h2https://static.zhihu.com/heifetz/chunks/shared-826b84a0e8ebf4ad4125f3058df7b8d7c0b5bca4.9172b81f5ec9e991f398.jsstatic.zhihu.com/heifetz/chunks/sha... https://static.zhihu.com/heifetz/chunks/shared-826b84a0e8ebf4ad4125f3058df7b8d7c0b5bca4.9172b81f5ec9e991f398.js — 200 — 43.0 KiB — 125 ms — h2https://static.zhihu.com/heifetz/chunks/shared-22ac597e2b2e44887007aa842dc2f83826976b28.04dcd582bf3d952bd3f0.jsstatic.zhihu.com/heifetz/chunks/sha... https://static.zhihu.com/heifetz/chunks/shared-22ac597e2b2e44887007aa842dc2f83826976b28.04dcd582bf3d952bd3f0.js — 200 — 7.6 KiB — 84 ms — h2https://static.zhihu.com/heifetz/chunks/shared-18537e556aae940e067d586c63e010f7a94fa952.222609349c69e7967d6e.jsstatic.zhihu.com/heifetz/chunks/sha... https://static.zhihu.com/heifetz/chunks/shared-18537e556aae940e067d586c63e010f7a94fa952.222609349c69e7967d6e.js — 200 — 15.6 KiB — 86 ms — h2
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blobhttps://www.zhihu.com/zbst/events/rwww.zhihu.com/zbst/events/r https://www.zhihu.com/zbst/events/r — 200 — 235 B — 378 ms — h3blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdfwww.zhihu.com/995a15f7-208d-4d42-b7... blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdf — 200 — -1 B — 22 ms — blobhttps://zhihu-web-analytics.zhihu.com/api/v2/za/logs/batchzhihu-web-analytics.zhihu.com/api/v... https://zhihu-web-analytics.zhihu.com/api/v2/za/logs/batch — 200 — 0 B — 273 ms — h2https://zhihu-web-analytics.zhihu.com/api/v3inv2/za/logs/batchzhihu-web-analytics.zhihu.com/api/v... https://zhihu-web-analytics.zhihu.com/api/v3inv2/za/logs/batch — 200 — 0 B — 272 ms — h2blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdfwww.zhihu.com/995a15f7-208d-4d42-b7... blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdf — 200 — -1 B — 7 ms — blobblob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdfwww.zhihu.com/995a15f7-208d-4d42-b7... blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdf — 200 — -1 B — 7 ms — blobblob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdfwww.zhihu.com/995a15f7-208d-4d42-b7... blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdf — 200 — -1 B — 7 ms — blobblob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdfwww.zhihu.com/995a15f7-208d-4d42-b7... blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdf — 200 — -1 B — 7 ms — blobblob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdfwww.zhihu.com/995a15f7-208d-4d42-b7... blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdf — 200 — -1 B — 7 ms — blobhttps://zhihu-web-analytics.zhihu.com/api/v2/za/logs/batchzhihu-web-analytics.zhihu.com/api/v... https://zhihu-web-analytics.zhihu.com/api/v2/za/logs/batch — 200 — 135 B — 283 ms — h2https://zhihu-web-analytics.zhihu.com/api/v3inv2/za/logs/batchzhihu-web-analytics.zhihu.com/api/v... https://zhihu-web-analytics.zhihu.com/api/v3inv2/za/logs/batch — 200 — 163 B — 281 ms — h2https://datahub.zhihu.com/collector/zlabdatahub.zhihu.com/collector/zlab https://datahub.zhihu.com/collector/zlab — 200 — 145 B — 181 ms — h2https://h5c-oneid.gepush.com/confuseapi?format=json&p=1&t=1h5c-oneid.gepush.com/confuseapi?for... https://h5c-oneid.gepush.com/confuseapi?format=json&p=1&t=1 — 200 — 687 B — 224 ms — http/1.1https://zhihu-web-analytics.zhihu.com/api/v2/za/logs/batchzhihu-web-analytics.zhihu.com/api/v... https://zhihu-web-analytics.zhihu.com/api/v2/za/logs/batch — 200 — 325 B — 282 ms — h3https://zhihu-web-analytics.zhihu.com/api/v3inv2/za/logs/batchzhihu-web-analytics.zhihu.com/api/v... https://zhihu-web-analytics.zhihu.com/api/v3inv2/za/logs/batch — 200 — 61 B — 274 ms — h3blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdfwww.zhihu.com/995a15f7-208d-4d42-b7... blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdf — 200 — -1 B — 7 ms — blobhttps://zhihu-web-analytics.zhihu.com/api/v3inv2/za/logs/batchzhihu-web-analytics.zhihu.com/api/v... https://zhihu-web-analytics.zhihu.com/api/v3inv2/za/logs/batch — 200 — 93 B — 280 ms — h3https://zxid-api.mobileservice.cn/sdk/base/reportzxid-api.mobileservice.cn/sdk/base/... https://zxid-api.mobileservice.cn/sdk/base/report — 200 — 523 B — 373 ms — h2blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdfwww.zhihu.com/995a15f7-208d-4d42-b7... blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdf — 200 — -1 B — 16 ms — blobblob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdfwww.zhihu.com/995a15f7-208d-4d42-b7... blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdf — 200 — -1 B — 13 ms — blobhttps://static.zhihu.com/heifetz/favicon.icostatic.zhihu.com/heifetz/favicon.ic... https://static.zhihu.com/heifetz/favicon.ico — 200 — 1.8 KiB — 28 ms — h2https://zhihu-web-analytics.zhihu.com/api/v2/za/logs/batchzhihu-web-analytics.zhihu.com/api/v... https://zhihu-web-analytics.zhihu.com/api/v2/za/logs/batch — 200 — 74 B — 288 ms — h3https://apm.zhihu.com/collector/apmapm.zhihu.com/collector/apm https://apm.zhihu.com/collector/apm — 200 — 0 B — 298 ms — h2https://apm.zhihu.com/collector/apmapm.zhihu.com/collector/apm https://apm.zhihu.com/collector/apm — 200 — 91 B — 256 ms — h3https://h5-oneid.gepush.com/cum-udc/PYcmpWAzT46f7UD9xy6UQ2/oneidh5-oneid.gepush.com/cum-udc/PYcmpWA... https://h5-oneid.gepush.com/cum-udc/PYcmpWAzT46f7UD9xy6UQ2/oneid — 200 — 0 B — 695 ms — http/1.1https://www.zhihu.com/sc-profiler-timingwww.zhihu.com/sc-profiler-timing https://www.zhihu.com/sc-profiler-timing — 204 — 89 B — 277 ms — h3blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdfwww.zhihu.com/995a15f7-208d-4d42-b7... blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdf — 200 — -1 B — 9 ms — blobhttps://apm.zhihu.com/collector/apmapm.zhihu.com/collector/apm https://apm.zhihu.com/collector/apm — 200 — 118 B — 208 ms — h3https://h5-oneid.gepush.com/cum-udc/PYcmpWAzT46f7UD9xy6UQ2/oneidh5-oneid.gepush.com/cum-udc/PYcmpWA... https://h5-oneid.gepush.com/cum-udc/PYcmpWAzT46f7UD9xy6UQ2/oneid — 200 — 690 B — 220 ms — http/1.1blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdfwww.zhihu.com/995a15f7-208d-4d42-b7... blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdf — 200 — -1 B — 9 ms — blobblob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdfwww.zhihu.com/995a15f7-208d-4d42-b7... blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdf — 200 — -1 B — 6 ms — blobhttps://zhihu-web-analytics.zhihu.com/api/v3inv2/za/logs/batchzhihu-web-analytics.zhihu.com/api/v... https://zhihu-web-analytics.zhihu.com/api/v3inv2/za/logs/batch — 200 — 49 B — 277 ms — h3blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdfwww.zhihu.com/995a15f7-208d-4d42-b7... blob:https://www.zhihu.com/995a15f7-208d-4d42-b7e5-918c8ce9ccdf — 200 — -1 B — 7 ms — blobhttps://apm.zhihu.com/collector/apmapm.zhihu.com/collector/apm https://apm.zhihu.com/collector/apm — 200 — 52 B — 253 ms — h3
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-party 7180ms · 1495KB · ¥354/mo
static.zhihu.com
Other
Costly
Execution 1662ms
Transfer 361 KB
Unused 66%
Monthly Cost ¥82/mo
static.zhihu.com
Other
Costly
Execution 1023ms
Transfer 118 KB
Unused 73%
Monthly Cost ¥50/mo
static.zhihu.com
Other
Costly
Execution 862ms
Transfer 40 KB
Monthly Cost ¥43/mo
Unattributable
Other
Costly
Execution 813ms
Transfer 0 KB
Monthly Cost ¥40/mo
www.zhihu.com
Other
Costly
Execution 656ms
Transfer 28 KB
Monthly Cost ¥32/mo
unpkg.zhimg.com
Other
Costly
Execution 601ms
Transfer 47 KB
Monthly Cost ¥30/mo
unpkg.zhimg.com
Other
Costly
Execution 576ms
Transfer 74 KB
Monthly Cost ¥28/mo
static.zhihu.com
Other
Costly
Execution 421ms
Transfer 787 KB
Unused 71%
Monthly Cost ¥21/mo
unpkg.zhimg.com
Other
Costly
Execution 381ms
Transfer 14 KB
Monthly Cost ¥19/mo
static.zhihu.com
Other
Optional
Execution 184ms
Transfer 25 KB
Monthly Cost ¥9/mo

These scripts may cost more than they're worth

  • static.zhihu.com adds 1662ms and costs ~¥82/month
  • static.zhihu.com adds 1023ms and costs ~¥50/month
  • static.zhihu.com adds 862ms and costs ~¥43/month
  • Unattributable adds 813ms and costs ~¥40/month
  • www.zhihu.com adds 656ms and costs ~¥32/month
  • unpkg.zhimg.com adds 601ms and costs ~¥30/month
  • unpkg.zhimg.com adds 576ms and costs ~¥28/month
  • static.zhihu.com adds 421ms and costs ~¥21/month
  • unpkg.zhimg.com adds 381ms and costs ~¥19/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

static.zhihu.com takes 1662ms 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

66% of static.zhihu.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

static.zhihu.com takes 1023ms 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

73% of static.zhihu.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

static.zhihu.com takes 862ms 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 813ms 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.zhihu.com takes 656ms 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

unpkg.zhimg.com takes 601ms 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

unpkg.zhimg.com takes 576ms 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

static.zhihu.com takes 421ms 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

71% of static.zhihu.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

unpkg.zhimg.com takes 381ms 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

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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