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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
2
PASS
5
INFO
2

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

Mobile Desktop
49
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
70
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.

2.07 s

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

2.20 s

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

689 ms

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.

2.88 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.

6.54 s

Page Load Progression

498 ms
997 ms
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
15
5 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 111 requests
FIX
3.4 MB transferred, 111 requests
Warning::
Page weighs 11.0 MB (3.4 MB transferred)
Warning::
JavaScript is 2.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.9 MB
Warning::
111 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.71 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
111 requests
0.71 g CO2 per page load
JavaScript 2.9 MiB 85%
Images 417.5 KiB 12%
CSS 65.9 KiB 2%
Fonts 17.7 KiB 1%
HTML 15.8 KiB 0%
Other 5.9 KiB 0%
Other 4.1 KiB 0%
Other 72 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 (3.4 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2286ms total JS execution
FIX
2286ms total JS execution
Warning::
https://static.zhihu.com/amadeus-rn/web/shared-ef9...: 610ms CPU time
Warning::
https://static.zhihu.com/heifetz/main.app.3fbde678...: 306ms CPU time
Warning::
https://www.zhihu.com/signin?next=%2F: 289ms CPU time
Warning::
Unattributable: 275ms CPU time
Info::
https://unpkg.zhimg.com/@cfe/sentry-script@1.3.1/d...: 186ms CPU time
Warning::
Third-party scripts: 2286ms (100% of total)

Main Thread Breakdown

Script Evaluation 68% Other 10% Script Parsing & Compilation 10% Style & Layout 9%
ScriptTotalScriptingParse/CompileParty
https://static.zhihu.com/amadeus-rn/web/shared-ef98b214814c8805.ca7a7ac003b24756.js610ms588ms18ms3rd
https://static.zhihu.com/heifetz/main.app.3fbde678b8f61cebb7af.js306ms265ms32ms3rd
https://www.zhihu.com/signin?next=%2F289ms27ms1ms3rd
Unattributable275ms74ms0ms3rd
https://unpkg.zhimg.com/@cfe/sentry-script@1.3.1/dist/init.js186ms133ms1ms3rd
https://unpkg.zhimg.com/za-js-sdk@5.6.0/dist/zap.js135ms123ms9ms3rd
https://cstaticdun.126.net/load.min.js134ms132ms1ms3rd
https://static.zhihu.com/event/wza/4633_1/aria.js?appid=a3637ace5dc3a347f6863b0bac487599129ms114ms10ms3rd
https://static.zhihu.com/heifetz/8395.app.67e4175617880cd253f4.js108ms36ms62ms3rd
https://static.zhihu.com/event/react@17.0.2/umd/react.production.min.js58ms53ms0ms3rd

Showing top 10 of 11 scripts

F
JS Bundles
Action
71 scripts, 1.4 MB unused
FIX
71 scripts, 1.4 MB unused
Warning::
https://static.zhihu.com/heifetz/8395.app.67e41756...: 573 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.zhihu.com/heifetz/main.app.3fbde678...: 260 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.zhihu.com/amadeus-rn/web/shared-163...: 120 KB unused (57%)
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://cstaticdun.126.net/2.28.5/core-optimi.m25b...: 78 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.4 MB
1392 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.zhihu.com/heifetz/8395.app.67e4175617880cd253f4.js791 KB573 KB (73%)✓3rd
https://static.zhihu.com/heifetz/main.app.3fbde678b8f61cebb7af.js375 KB260 KB (70%)✓3rd
https://static.zhihu.com/amadeus-rn/web/shared-1637117f027caece.06ea943e1ff2da6f.js212 KB120 KB (57%)✓3rd
https://static.zhihu.com/event/wza/4633_1/aria.js?appid=a3637ace5dc3a347f6863b0bac487599118 KB85 KB (73%)✓3rd
https://cstaticdun.126.net/2.28.5/core-optimi.m25b40.v2.28.5.min.js?v=2960605180 KB78 KB (44%)✓3rd
https://static.zhihu.com/amadeus-rn/web/shared-ef98b214814c8805.ca7a7ac003b24756.js305 KB75 KB (25%)✓3rd
https://static.zhihu.com/heifetz/vendor.007c46aa2a2931497960.js67 KB32 KB (48%)✓3rd
https://static.zhihu.com/amadeus-rn/web/shared-4300cebafe39d3a8.f116bb4b1e6bf128.js32 KB28 KB (87%)✓3rd
https://static.zhihu.com/amadeus-rn/web/shared-60696d0f627d269d.22e16f99938d401e.js38 KB26 KB (68%)✓3rd
https://static.zhihu.com/amadeus-rn/web/shared-298c47547c387857.09656bfa740afbae.js27 KB25 KB (92%)✓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
111 resources · 3.4 MB · 1.4 MB savings available
FIX
111 resources · 3.4 MB · 1.4 MB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~1.4 MB of savings available
Warning::
110 third-party resources (100% of weight)
Info::
5 resources over 200KB
111 resources · 3.4 MiB · 110 third-party 2.4 MiB over 1MB target
JavaScript 85% · 2.9 MiB
Image 12% · 419.4 KiB
CSS 2% · 65.9 KiB
Document 1% · 18.0 KiB
Font 1% · 17.7 KiB
Other 0% · 6.0 KiB

~1.4 MiB of savings available

Remove unused JavaScript: 1.4 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
6 images, 0 KB saveable
REVIEW
6 images, 0 KB saveable
Warning::
https://pic3.zhimg.com/80/v2-d0289dc0a46fc5b15b336... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
6 images 418 KB
0 oversized -0 KB
6 legacy format
1 missing dimensions CLS 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

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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 2.1 s LCP 2.2 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 — 8 ms — font-display: swap
subset-0.woff2 woff2 swap
Size 18 KB
Load time 8 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
111 requests over 9350ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.1 s LCP 2.2 shttps://zhihu.com// https://zhihu.com/ — 301 — 266 B — 929 ms — h2https://www.zhihu.com/www.zhihu.com/ https://www.zhihu.com/ — 302 — 1.8 KiB — 372 ms — h2https://www.zhihu.com/signin?next=%2Fwww.zhihu.com/signin?next=%2F https://www.zhihu.com/signin?next=%2F — 200 — 15.8 KiB — 296 ms — h2https://static.zhihu.com/heifetz/8395.216a26f4.2afeae5366d99d24482a.cssstatic.zhihu.com/heifetz/8395.216a2... https://static.zhihu.com/heifetz/8395.216a26f4.2afeae5366d99d24482a.css — 200 — 27.9 KiB — 107 ms — h2https://static.zhihu.com/heifetz/main.216a26f4.c474a29726a94e27199a.cssstatic.zhihu.com/heifetz/main.216a2... https://static.zhihu.com/heifetz/main.216a26f4.c474a29726a94e27199a.css — 200 — 26.6 KiB — 108 ms — h2https://static.zhihu.com/heifetz/main-signin-routes.216a26f4.b5c40ac2c6385d5afdce.cssstatic.zhihu.com/heifetz/main-signi... https://static.zhihu.com/heifetz/main-signin-routes.216a26f4.b5c40ac2c6385d5afdce.css — 200 — 3.7 KiB — 116 ms — h2https://pic2.zhimg.com/80/v2-f6b1f64a098b891b4ea1e3104b5b71f6_720w.pngpic2.zhimg.com/80/v2-f6b1f64a098b89... https://pic2.zhimg.com/80/v2-f6b1f64a098b891b4ea1e3104b5b71f6_720w.png — 200 — 9.8 KiB — 95 ms — http/1.1https://pic3.zhimg.com/80/v2-d0289dc0a46fc5b15b3363ffa78cf6c7.pngpic3.zhimg.com/80/v2-d0289dc0a46fc5... https://pic3.zhimg.com/80/v2-d0289dc0a46fc5b15b3363ffa78cf6c7.png — 200 — 5.3 KiB — 87 ms — http/1.1https://static.zhihu.com/heifetz/vendor.007c46aa2a2931497960.jsstatic.zhihu.com/heifetz/vendor.007... https://static.zhihu.com/heifetz/vendor.007c46aa2a2931497960.js — 200 — 67.4 KiB — 57 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 — 51 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 — 33 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 — 56 ms — h2https://static.zhihu.com/heifetz/runtime.app.c99d3f439fa940067611.jsstatic.zhihu.com/heifetz/runtime.ap... https://static.zhihu.com/heifetz/runtime.app.c99d3f439fa940067611.js — 200 — 8.8 KiB — 56 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 — 72 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 — 16.5 KiB — 73 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 — 73 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 — 63 ms — h2https://static.zhihu.com/heifetz/lib-f3572862.app.6a0660d646c34c296ccc.jsstatic.zhihu.com/heifetz/lib-f35728... https://static.zhihu.com/heifetz/lib-f3572862.app.6a0660d646c34c296ccc.js — 200 — 14.4 KiB — 62 ms — h2https://static.zhihu.com/heifetz/lib-0e5ce61e.app.b41c0f737f74d4301de6.jsstatic.zhihu.com/heifetz/lib-0e5ce6... https://static.zhihu.com/heifetz/lib-0e5ce61e.app.b41c0f737f74d4301de6.js — 200 — 16.7 KiB — 73 ms — h2https://static.zhihu.com/heifetz/lib-83b0f42f.app.85f2b466f712783817fd.jsstatic.zhihu.com/heifetz/lib-83b0f4... https://static.zhihu.com/heifetz/lib-83b0f42f.app.85f2b466f712783817fd.js — 200 — 10.8 KiB — 62 ms — h2https://static.zhihu.com/heifetz/8395.app.67e4175617880cd253f4.jsstatic.zhihu.com/heifetz/8395.app.6... https://static.zhihu.com/heifetz/8395.app.67e4175617880cd253f4.js — 200 — 791.0 KiB — 132 ms — h2https://static.zhihu.com/heifetz/main.app.3fbde678b8f61cebb7af.jsstatic.zhihu.com/heifetz/main.app.3... https://static.zhihu.com/heifetz/main.app.3fbde678b8f61cebb7af.js — 200 — 374.6 KiB — 112 ms — h2https://static.zhihu.com/heifetz/chunks/shared-1dffcf43329e08de9bcf385e1895bae6667163e6.b85746a093cb201edae2.jsstatic.zhihu.com/heifetz/chunks/sha... https://static.zhihu.com/heifetz/chunks/shared-1dffcf43329e08de9bcf385e1895bae6667163e6.b85746a093cb201edae2.js — 200 — 16.3 KiB — 91 ms — h2https://static.zhihu.com/heifetz/chunks/main-signin-routes.a9e265ed34ed78af48e0.jsstatic.zhihu.com/heifetz/chunks/mai... https://static.zhihu.com/heifetz/chunks/main-signin-routes.a9e265ed34ed78af48e0.js — 200 — 2.3 KiB — 60 ms — h2https://static.zhihu.com/event/wza/4633_1/aria.js?appid=a3637ace5dc3a347f6863b0bac487599static.zhihu.com/event/wza/4633_1/a... https://static.zhihu.com/event/wza/4633_1/aria.js?appid=a3637ace5dc3a347f6863b0bac487599 — 200 — 118.0 KiB — 73 ms — h2https://hm.baidu.com/hm.js?98beee57fd2ef70ccdd5ca52b9740c49hm.baidu.com/hm.js?98beee57fd2ef70c... https://hm.baidu.com/hm.js?98beee57fd2ef70ccdd5ca52b9740c49 — 200 — 11.6 KiB — 735 ms — http/1.1https://unpkg.zhimg.com/@cfe/sentry-script@1.3.1/dist/init.jsunpkg.zhimg.com/@cfe/sentry-script@... https://unpkg.zhimg.com/@cfe/sentry-script@1.3.1/dist/init.js — 200 — 14.7 KiB — 15 ms — h2https://static.zhihu.com/heifetz/assets/sign_bg.47eec442.pngstatic.zhihu.com/heifetz/assets/sig... https://static.zhihu.com/heifetz/assets/sign_bg.47eec442.png — 200 — 388.5 KiB — 120 ms — h2https://pica.zhimg.com/80/v2-ccdb7828c12afff31a27e51593d23260_720w.pngpica.zhimg.com/80/v2-ccdb7828c12aff... https://pica.zhimg.com/80/v2-ccdb7828c12afff31a27e51593d23260_720w.png — 200 — 9.4 KiB — 108 ms — http/1.1https://unpkg.zhimg.com/@cfe/font-misans@1.1.1/dist/font.min.cssunpkg.zhimg.com/@cfe/font-misans@1.... https://unpkg.zhimg.com/@cfe/font-misans@1.1.1/dist/font.min.css — 200 — 4.2 KiB — 6 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.1 s LCP 2.2 shttps://zhihu.com// https://zhihu.com/ — 301 — 266 B — 929 ms — h2https://www.zhihu.com/www.zhihu.com/ https://www.zhihu.com/ — 302 — 1.8 KiB — 372 ms — h2https://www.zhihu.com/signin?next=%2Fwww.zhihu.com/signin?next=%2F https://www.zhihu.com/signin?next=%2F — 200 — 15.8 KiB — 296 ms — h2https://static.zhihu.com/heifetz/8395.216a26f4.2afeae5366d99d24482a.cssstatic.zhihu.com/heifetz/8395.216a2... https://static.zhihu.com/heifetz/8395.216a26f4.2afeae5366d99d24482a.css — 200 — 27.9 KiB — 107 ms — h2https://static.zhihu.com/heifetz/main.216a26f4.c474a29726a94e27199a.cssstatic.zhihu.com/heifetz/main.216a2... https://static.zhihu.com/heifetz/main.216a26f4.c474a29726a94e27199a.css — 200 — 26.6 KiB — 108 ms — h2https://static.zhihu.com/heifetz/main-signin-routes.216a26f4.b5c40ac2c6385d5afdce.cssstatic.zhihu.com/heifetz/main-signi... 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https://static.zhihu.com/amadeus-rn/web/shared-07e3b8d7f3535a74.cdca1797ddc5fc64.js — 200 — 27.9 KiB — 175 ms — h2https://static.zhihu.com/amadeus-rn/web/shared-b7f3641471da7334.a5f5781713c50b23.jsstatic.zhihu.com/amadeus-rn/web/sha... https://static.zhihu.com/amadeus-rn/web/shared-b7f3641471da7334.a5f5781713c50b23.js — 200 — 20.9 KiB — 163 ms — h2https://static.zhihu.com/amadeus-rn/web/shared-10b87c4fd9bb8218.b47be30a47e332b1.jsstatic.zhihu.com/amadeus-rn/web/sha... https://static.zhihu.com/amadeus-rn/web/shared-10b87c4fd9bb8218.b47be30a47e332b1.js — 200 — 13.7 KiB — 160 ms — h2https://static.zhihu.com/amadeus-rn/web/shared-4300cebafe39d3a8.f116bb4b1e6bf128.jsstatic.zhihu.com/amadeus-rn/web/sha... https://static.zhihu.com/amadeus-rn/web/shared-4300cebafe39d3a8.f116bb4b1e6bf128.js — 200 — 32.5 KiB — 169 ms — h2https://static.zhihu.com/amadeus-rn/web/shared-298c47547c387857.09656bfa740afbae.jsstatic.zhihu.com/amadeus-rn/web/sha... https://static.zhihu.com/amadeus-rn/web/shared-298c47547c387857.09656bfa740afbae.js — 200 — 27.3 KiB — 184 ms — h2https://static.zhihu.com/amadeus-rn/web/pages_ZhidaPage_webPages_AIPanel_index_tsx.61f0564f8695d650.jsstatic.zhihu.com/amadeus-rn/web/pag... https://static.zhihu.com/amadeus-rn/web/pages_ZhidaPage_webPages_AIPanel_index_tsx.61f0564f8695d650.js — 200 — 1.7 KiB — 177 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 — 326 B — 911 ms — h3https://cstaticdun.126.net/load.min.jscstaticdun.126.net/load.min.js https://cstaticdun.126.net/load.min.js — 200 — 15.0 KiB — 1.2 s — http/1.1blob:https://www.zhihu.com/9179640d-7804-42f3-b6a8-e2ac24fcca47www.zhihu.com/9179640d-7804-42f3-b6... blob:https://www.zhihu.com/9179640d-7804-42f3-b6a8-e2ac24fcca47 — 200 — -1 B — 16 ms — 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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 2286ms · 1892KB · ¥113/mo
static.zhihu.com
Other
Costly
Execution 610ms
Transfer 305 KB
Unused 25%
Monthly Cost ¥30/mo
static.zhihu.com
Other
Costly
Execution 306ms
Transfer 375 KB
Unused 70%
Monthly Cost ¥15/mo
www.zhihu.com
Other
Costly
Execution 289ms
Transfer 16 KB
Monthly Cost ¥14/mo
Unattributable
Other
Costly
Execution 275ms
Transfer 0 KB
Monthly Cost ¥14/mo
unpkg.zhimg.com
Other
Optional
Execution 186ms
Transfer 15 KB
Monthly Cost ¥9/mo
unpkg.zhimg.com
Other
Optional
Execution 135ms
Transfer 74 KB
Monthly Cost ¥7/mo
cstaticdun.126.net
Other
Optional
Execution 134ms
Transfer 15 KB
Monthly Cost ¥7/mo
static.zhihu.com
Other
Optional
Execution 129ms
Transfer 118 KB
Unused 73%
Monthly Cost ¥6/mo
static.zhihu.com
Other
Optional
Execution 108ms
Transfer 791 KB
Unused 73%
Monthly Cost ¥5/mo
static.zhihu.com
Other
Optional
Execution 58ms
Transfer 5 KB
Monthly Cost ¥3/mo
cstaticdun.126.net
Other
Optional
Execution 56ms
Transfer 180 KB
Unused 44%
Monthly Cost ¥3/mo

These scripts may cost more than they're worth

  • static.zhihu.com adds 610ms and costs ~¥30/month
  • static.zhihu.com adds 306ms and costs ~¥15/month
  • www.zhihu.com adds 289ms and costs ~¥14/month
  • Unattributable adds 275ms and costs ~¥14/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 610ms 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 306ms 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

70% 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

www.zhihu.com takes 289ms 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 275ms 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

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

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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