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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
93
GRADE
A
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
62
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
59
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

3.36 s

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

3.69 s

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

0 ms

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

0.023

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

3.36 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.

3.69 s

Page Load Progression

570 ms
1.1 s
1.7 s
2.3 s
2.9 s
3.4 s
4.0 s
4.6 s
Checks
15
6 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 74 requests
FIX
2.2 MB transferred, 74 requests
Info::
Page weighs 3.0 MB (2.2 MB transferred)
Warning::
Images are 1.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.9 MB
Info::
74 HTTP requests
Info::
Estimated 0.47 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
74 requests
0.47 g CO2 per page load
Images 1.9 MiB 83%
JavaScript 253.9 KiB 11%
CSS 105.3 KiB 5%
HTML 16.6 KiB 1%
Other 5.9 KiB 0%
Other 2.8 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
74 resources · 2.2 MB · 66 KB savings available
FIX
74 resources · 2.2 MB · 66 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~66 KB of savings available
Warning::
73 third-party resources (100% of weight)
Info::
2 resources over 200KB
74 resources · 2.2 MiB · 73 third-party 1.2 MiB over 1MB target
Image 83% · 1.9 MiB
JavaScript 11% · 253.9 KiB
CSS 5% · 105.3 KiB
Document 1% · 16.8 KiB
Other 0% · 2.8 KiB

~66.2 KiB of savings available

Remove unused JavaScript: 66.2 KiB
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.

C
Image Optimization
Action
44 images, 0 KB saveable
REVIEW
44 images, 0 KB saveable
Warning::
https://img1.doubanio.com/f/vendors/a1fdee122b9574... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img3.doubanio.com/view/group_topic/large/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.doubanio.com/f/vendors/780d038ed1c7be... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img2.doubanio.com/cuphead/sns-static/anony... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img3.doubanio.com/icon/u162973006-2.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img3.doubanio.com/cuphead/sns-static/anony... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.doubanio.com/f/vendors/c24b99a14ebc3f... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img3.doubanio.com/icon/u46048488-2.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img1.doubanio.com/icon/u78636889-18.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
44 images 1.9 MB
0 oversized -0 KB
32 legacy format
9 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

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

B
JS Bundles
20 scripts, 66 KB unused
REVIEW
20 scripts, 66 KB unused
Warning::
https://img1.doubanio.com/f/accounts/d3f1e496bbba8...: 43 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://img1.doubanio.com/f/vendors/e258329ca4b212...: 23 KB unused (92%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://img1.doubanio.com/f/vendors/e258329ca4b212...: unminified — 8 KB could be saved
Info::
Total unused JavaScript: 66 KB
66 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://img1.doubanio.com/f/accounts/d3f1e496bbba865fc0ad8c2b0480dcb388ced80f/dist/passport/login/base.js87 KB43 KB (50%)✓3rd
https://img1.doubanio.com/f/vendors/e258329ca4b2122b4efe53fddc418967441e0e7f/js/douban.js26 KB23 KB (92%)✗3rd
https://img1.doubanio.com/f/accounts/47d0af5038f4f733a9e167c6784d8adf37cbc138/dist/passport/polyfill.js10 KB—✓3rd
https://img1.doubanio.com/f/vendors/b0d3faaf7a432605add54908e39e17746824d6cc/js/separation/_all.js2 KB—✓3rd
https://img1.doubanio.com/f/vendors/f25ae221544f39046484a823776f3aa01769ee10/js/ui/dialog.js3 KB—✓3rd
https://img1.doubanio.com/f/vendors/c714e1dc3cceb07b6e7c095e01fe136cf79726b1/js/sns/fp/base.js1 KB—✓3rd
https://img1.doubanio.com/f/vendors/6a6ebb88ef379a31fe198305b7cd75aafa3314f4/js/sns/fp/lazypic.js1 KB—✓3rd
https://img1.doubanio.com/f/vendors/8360a10d497f46c162c6c527954f580eedc4d4e0/js/sns/fp/inp_label.js1 KB—✓3rd
https://img1.doubanio.com/f/vendors/0be2f3b8c39486ca57872ce65ac23f50a11aca9f/js/lib/head.js3 KB—✓3rd
https://img1.doubanio.com/cuphead/sns-static/common/hot_topics/render.744bd.js1 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

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+
JS Execution Cost
326ms total JS execution
PASS
326ms total JS execution
Info::
https://www.douban.com/: 237ms CPU time
Info::
Unattributable: 88ms CPU time
Warning::
Third-party scripts: 326ms (100% of total)

Main Thread Breakdown

Style & Layout 34% Other 24% Script Evaluation 22% Rendering 12% Script Parsing & Compilation 4% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.douban.com/237ms3ms1ms3rd
Unattributable88ms2ms0ms3rd
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
74 requests over 4703ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.4 s LCP 3.7 shttps://douban.com// https://douban.com/ — 301 — 115 B — 493 ms — h2https://www.douban.com/www.douban.com/ https://www.douban.com/ — 200 — 14.8 KiB — 426 ms — h2https://img1.doubanio.com/f/vendors/e8a7261937da62636d22ca4c579efc4a4d759b1b/css/ui/dialog.cssimg1.doubanio.com/f/vendors/e8a7261... https://img1.doubanio.com/f/vendors/e8a7261937da62636d22ca4c579efc4a4d759b1b/css/ui/dialog.css — 200 — 1.1 KiB — 979 ms — h2https://img1.doubanio.com/f/vendors/3a8b90f5419888f58be10eaba23e024bb4caf9c3/css/core/_init_.cssimg1.doubanio.com/f/vendors/3a8b90f... https://img1.doubanio.com/f/vendors/3a8b90f5419888f58be10eaba23e024bb4caf9c3/css/core/_init_.css — 200 — 7.6 KiB — 980 ms — h2https://img2.doubanio.com/cuphead/sns-static/anony-home/css/index.bd71e.cssimg2.doubanio.com/cuphead/sns-stati... https://img2.doubanio.com/cuphead/sns-static/anony-home/css/index.bd71e.css — 200 — 65.5 KiB — 1.3 s — h2https://img1.doubanio.com/f/vendors/0511abe9863c2ea7084efa7e24d1d86c5b3974f1/js/jquery-1.10.2.min.jsimg1.doubanio.com/f/vendors/0511abe... https://img1.doubanio.com/f/vendors/0511abe9863c2ea7084efa7e24d1d86c5b3974f1/js/jquery-1.10.2.min.js — 200 — 34.4 KiB — 1.6 s — h2https://img1.doubanio.com/f/vendors/b0d3faaf7a432605add54908e39e17746824d6cc/js/separation/_all.jsimg1.doubanio.com/f/vendors/b0d3faa... https://img1.doubanio.com/f/vendors/b0d3faaf7a432605add54908e39e17746824d6cc/js/separation/_all.js — 200 — 2.1 KiB — 1.6 s — h2https://img1.doubanio.com/f/vendors/e258329ca4b2122b4efe53fddc418967441e0e7f/js/douban.jsimg1.doubanio.com/f/vendors/e258329... https://img1.doubanio.com/f/vendors/e258329ca4b2122b4efe53fddc418967441e0e7f/js/douban.js — 200 — 25.9 KiB — 1.6 s — h2https://img1.doubanio.com/f/vendors/084b39fa262eabe5828059b3e8072184589b6b89/js/core/_init_.jsimg1.doubanio.com/f/vendors/084b39f... https://img1.doubanio.com/f/vendors/084b39fa262eabe5828059b3e8072184589b6b89/js/core/_init_.js — 200 — 4.7 KiB — 1.6 s — h2https://img1.doubanio.com/f/vendors/f25ae221544f39046484a823776f3aa01769ee10/js/ui/dialog.jsimg1.doubanio.com/f/vendors/f25ae22... https://img1.doubanio.com/f/vendors/f25ae221544f39046484a823776f3aa01769ee10/js/ui/dialog.js — 200 — 3.2 KiB — 1.6 s — h2https://img1.doubanio.com/f/vendors/c714e1dc3cceb07b6e7c095e01fe136cf79726b1/js/sns/fp/base.jsimg1.doubanio.com/f/vendors/c714e1d... https://img1.doubanio.com/f/vendors/c714e1dc3cceb07b6e7c095e01fe136cf79726b1/js/sns/fp/base.js — 200 — 865 B — 1.6 s — h2https://img1.doubanio.com/f/vendors/6a6ebb88ef379a31fe198305b7cd75aafa3314f4/js/sns/fp/lazypic.jsimg1.doubanio.com/f/vendors/6a6ebb8... https://img1.doubanio.com/f/vendors/6a6ebb88ef379a31fe198305b7cd75aafa3314f4/js/sns/fp/lazypic.js — 200 — 802 B — 978 ms — h2https://img1.doubanio.com/f/vendors/8360a10d497f46c162c6c527954f580eedc4d4e0/js/sns/fp/inp_label.jsimg1.doubanio.com/f/vendors/8360a10... https://img1.doubanio.com/f/vendors/8360a10d497f46c162c6c527954f580eedc4d4e0/js/sns/fp/inp_label.js — 200 — 597 B — 1.6 s — h2https://img1.doubanio.com/f/vendors/0be2f3b8c39486ca57872ce65ac23f50a11aca9f/js/lib/head.jsimg1.doubanio.com/f/vendors/0be2f3b... https://img1.doubanio.com/f/vendors/0be2f3b8c39486ca57872ce65ac23f50a11aca9f/js/lib/head.js — 200 — 2.9 KiB — 1.6 s — h2https://img1.doubanio.com/f/vendors/ea5abddc5c3fe55bc2ddc2e6c21ca4d035e19da8/pics/accounts/doubanapp_qrcode.pngimg1.doubanio.com/f/vendors/ea5abdd... https://img1.doubanio.com/f/vendors/ea5abddc5c3fe55bc2ddc2e6c21ca4d035e19da8/pics/accounts/doubanapp_qrcode.png — 200 — 18.1 KiB — 680 ms — h2https://img1.doubanio.com/cuphead/sns-static/common/hot_topics/style.38f5b.cssimg1.doubanio.com/cuphead/sns-stati... https://img1.doubanio.com/cuphead/sns-static/common/hot_topics/style.38f5b.css — 200 — 1.1 KiB — 691 ms — h2https://img1.doubanio.com/cuphead/sns-static/common/hot_topics/render.744bd.jsimg1.doubanio.com/cuphead/sns-stati... https://img1.doubanio.com/cuphead/sns-static/common/hot_topics/render.744bd.js — 200 — 1.5 KiB — 322 ms — h2https://img3.doubanio.com/cuphead/sns-static/legacy/doulist/css/list.bb587.cssimg3.doubanio.com/cuphead/sns-stati... https://img3.doubanio.com/cuphead/sns-static/legacy/doulist/css/list.bb587.css — 200 — 7.4 KiB — 172 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAJoAAAAeCAMAAADjAPfrAAADAFBMVEXt9O0iijEdjsn3v4Y5lkbU5…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAJoAAAAeCAMAAADjAPfrAAADAFBMVEXt9O0iijEdjsn3v4Y5lkbU5… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAc8AAAAUCAMAAADcKEZBAAAC9FBMVEX////XPSrzfQD3/Pv6/f07g…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAc8AAAAUCAMAAADcKEZBAAAC9FBMVEX////XPSrzfQD3/Pv6/f07g… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAUCAMAAADImI+JAAAAjVBMVEUAAAA4n604nq06oK09orE5o…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAUCAMAAADImI+JAAAAjVBMVEUAAAA4n604nq06oK09orE5o… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAVCAYAAAA0GqweAAAAAXNSR0IArs4c6QAABDJJREFUSA21l…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAVCAYAAAA0GqweAAAAAXNSR0IArs4c6QAABDJJREFUSA21l… — 200 — 0 B — 0 ms — datahttps://accounts.douban.com/passport/login_popup?login_source=anonyaccounts.douban.com/passport/login_... https://accounts.douban.com/passport/login_popup?login_source=anony — 200 — 1.9 KiB — 226 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA0AAAANCAMAAABFNRROAAAALVBMVEX6+vr19fX9/f37+/v+/v75+…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA0AAAANCAMAAABFNRROAAAALVBMVEX6+vr19fX9/f37+/v+/v75+… — 200 — 0 B — 0 ms — datahttps://img3.doubanio.com/view/group_topic/large/public/p728079573.jpgimg3.doubanio.com/view/group_topic/... https://img3.doubanio.com/view/group_topic/large/public/p728079573.jpg — 200 — 77.7 KiB — 159 ms — h2https://img3.doubanio.com/icon/u162973006-2.jpgimg3.doubanio.com/icon/u162973006-2... https://img3.doubanio.com/icon/u162973006-2.jpg — 200 — 2.4 KiB — 156 ms — h2https://img1.doubanio.com/icon/u78636889-18.jpgimg1.doubanio.com/icon/u78636889-18... https://img1.doubanio.com/icon/u78636889-18.jpg — 200 — 2.2 KiB — 334 ms — h2https://img9.doubanio.com/view/puppy_image/raw/public/1771365ca98ig9er706.jpgimg9.doubanio.com/view/puppy_image/... https://img9.doubanio.com/view/puppy_image/raw/public/1771365ca98ig9er706.jpg — 200 — 167.9 KiB — 175 ms — h2https://img2.doubanio.com/cuphead/sns-static/anony-home/pics/sitename.pngimg2.doubanio.com/cuphead/sns-stati... https://img2.doubanio.com/cuphead/sns-static/anony-home/pics/sitename.png — 200 — 6.3 KiB — 243 ms — h2https://img1.doubanio.com/cuphead/sns-static/anony-home/pics/icon_qrcode_green.pngimg1.doubanio.com/cuphead/sns-stati... https://img1.doubanio.com/cuphead/sns-static/anony-home/pics/icon_qrcode_green.png — 200 — 585 B — 329 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.4 s LCP 3.7 shttps://douban.com// https://douban.com/ — 301 — 115 B — 493 ms — h2https://www.douban.com/www.douban.com/ https://www.douban.com/ — 200 — 14.8 KiB — 426 ms — h2https://img1.doubanio.com/f/vendors/e8a7261937da62636d22ca4c579efc4a4d759b1b/css/ui/dialog.cssimg1.doubanio.com/f/vendors/e8a7261... https://img1.doubanio.com/f/vendors/e8a7261937da62636d22ca4c579efc4a4d759b1b/css/ui/dialog.css — 200 — 1.1 KiB — 979 ms — h2https://img1.doubanio.com/f/vendors/3a8b90f5419888f58be10eaba23e024bb4caf9c3/css/core/_init_.cssimg1.doubanio.com/f/vendors/3a8b90f... https://img1.doubanio.com/f/vendors/3a8b90f5419888f58be10eaba23e024bb4caf9c3/css/core/_init_.css — 200 — 7.6 KiB — 980 ms — h2https://img2.doubanio.com/cuphead/sns-static/anony-home/css/index.bd71e.cssimg2.doubanio.com/cuphead/sns-stati... https://img2.doubanio.com/cuphead/sns-static/anony-home/css/index.bd71e.css — 200 — 65.5 KiB — 1.3 s — h2https://img1.doubanio.com/f/vendors/0511abe9863c2ea7084efa7e24d1d86c5b3974f1/js/jquery-1.10.2.min.jsimg1.doubanio.com/f/vendors/0511abe... https://img1.doubanio.com/f/vendors/0511abe9863c2ea7084efa7e24d1d86c5b3974f1/js/jquery-1.10.2.min.js — 200 — 34.4 KiB — 1.6 s — h2https://img1.doubanio.com/f/vendors/b0d3faaf7a432605add54908e39e17746824d6cc/js/separation/_all.jsimg1.doubanio.com/f/vendors/b0d3faa... https://img1.doubanio.com/f/vendors/b0d3faaf7a432605add54908e39e17746824d6cc/js/separation/_all.js — 200 — 2.1 KiB — 1.6 s — h2https://img1.doubanio.com/f/vendors/e258329ca4b2122b4efe53fddc418967441e0e7f/js/douban.jsimg1.doubanio.com/f/vendors/e258329... https://img1.doubanio.com/f/vendors/e258329ca4b2122b4efe53fddc418967441e0e7f/js/douban.js — 200 — 25.9 KiB — 1.6 s — h2https://img1.doubanio.com/f/vendors/084b39fa262eabe5828059b3e8072184589b6b89/js/core/_init_.jsimg1.doubanio.com/f/vendors/084b39f... 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https://fundin.douban.com/piwik?action_name=%E8%B1%86%E7%93%A3&idsite=100001&rec=1&r=333141&h=19&m=45&s=36&url=https%3A%2F%2Fwww.douban.com%2F&_id=e29bbf62a382d155&_idn=1&send_image=1&_refts=0&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=800x600&pv_id=u0rXU5&pf_net=0&pf_srv=424&pf_tfr=1&pf_dm1=2103&uadata=%7B%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22147.0.7727.101%22%7D%2C%7B%22brand%22%3A%22Not.A%2FBrand%22%2C%22version%22%3A%228.0.0.0%22%7D%5D%2C%22mobile%22%3Afalse%2C%22model%22%3A%22%22%2C%22platform%22%3A%22macOS%22%2C%22platformVersion%22%3A%2210.15.7%22%7D — -1 — 0 B — 297 ms — https://img3.doubanio.com/view/treasury_image/raw/public/c1ed329330a82aa.jpgimg3.doubanio.com/view/treasury_ima... https://img3.doubanio.com/view/treasury_image/raw/public/c1ed329330a82aa.jpg — 200 — 120.2 KiB — 7 ms — h2https://img3.doubanio.com/view/treasury_image/raw/public/f5c360e88382bb3.jpgimg3.doubanio.com/view/treasury_ima... https://img3.doubanio.com/view/treasury_image/raw/public/f5c360e88382bb3.jpg — 200 — 139.9 KiB — 7 ms — h2https://img3.doubanio.com/view/treasury_image/raw/public/a3b47d609c2d91f.jpgimg3.doubanio.com/view/treasury_ima... https://img3.doubanio.com/view/treasury_image/raw/public/a3b47d609c2d91f.jpg — 200 — 162.4 KiB — 7 ms — h2https://img2.doubanio.com/view/treasury_image/raw/public/b89edb8584eed2e.jpgimg2.doubanio.com/view/treasury_ima... https://img2.doubanio.com/view/treasury_image/raw/public/b89edb8584eed2e.jpg — 200 — 310.3 KiB — 715 ms — h2https://img1.doubanio.com/view/treasury_image/raw/public/5eb02da07333479.jpgimg1.doubanio.com/view/treasury_ima... https://img1.doubanio.com/view/treasury_image/raw/public/5eb02da07333479.jpg — 200 — 258.5 KiB — 392 ms — h2https://erebor.douban.com/?unit=dale_anonymous_homepage_top_for_crazy_ad&bid=BDkQeT9wuXI&crtr=3%3A%2F&ts=1776800736304&callback=erebor_70EF1D69700047158CD48C3C001FBCB2erebor.douban.com/?unit=dale_anonym... https://erebor.douban.com/?unit=dale_anonymous_homepage_top_for_crazy_ad&bid=BDkQeT9wuXI&crtr=3%3A%2F&ts=1776800736304&callback=erebor_70EF1D69700047158CD48C3C001FBCB2 — 200 — 262 B — 496 ms — h2https://erebor.douban.com/?unit=dale_anonymous_homepage_right_top&bid=BDkQeT9wuXI&crtr=3%3A%2F&ts=1776800736305&callback=erebor_859E0C2761F046318192FB7B5D8A2E27erebor.douban.com/?unit=dale_anonym... https://erebor.douban.com/?unit=dale_anonymous_homepage_right_top&bid=BDkQeT9wuXI&crtr=3%3A%2F&ts=1776800736305&callback=erebor_859E0C2761F046318192FB7B5D8A2E27 — 200 — 1.3 KiB — 496 ms — h2https://img1.doubanio.com/view/dale-online/dale_ad/public/ae3a38851b28f2c.jpg?company_token=kX69T8w1wyOE-daleimg1.doubanio.com/view/dale-online/... https://img1.doubanio.com/view/dale-online/dale_ad/public/ae3a38851b28f2c.jpg?company_token=kX69T8w1wyOE-dale — 200 — 53.5 KiB — 327 ms — h2https://erebor.douban.com/count/?action=redirect&ad=268324&ad_type=0&al=3&bid=BDkQeT9wuXI&bid_type=__BID_TYPE__&brand=&chicken=68b714907293f14714479d2ba1018f0c&creative=1P_250x125&crtr=3%3A%2F&device=0&disable_creative=false&disable_third=false&high_value=false&hn=anson37&imp_type=2&is_cache=false&is_cmp=false&is_core=false&is_ht=false&is_short=false&item_type=COMPLEMENT&mark=&model=&net=&ns=1776800736723826130&os=51&osv=10_15_7&p=0&posid=&price=TITDjNM8_pF57taxshxwGg&priority=2&punit=yuan&region=2cea7bd8ee14aee7&t_mode=&ts=__TIMESTAMP__&ts_ms=__TIMESTAMP_MS__&type=impression&uid=&unit=dale_anonymous_homepage_right_top&vendor=Appleerebor.douban.com/count/?action=red... https://erebor.douban.com/count/?action=redirect&ad=268324&ad_type=0&al=3&bid=BDkQeT9wuXI&bid_type=__BID_TYPE__&brand=&chicken=68b714907293f14714479d2ba1018f0c&creative=1P_250x125&crtr=3%3A%2F&device=0&disable_creative=false&disable_third=false&high_value=false&hn=anson37&imp_type=2&is_cache=false&is_cmp=false&is_core=false&is_ht=false&is_short=false&item_type=COMPLEMENT&mark=&model=&net=&ns=1776800736723826130&os=51&osv=10_15_7&p=0&posid=&price=TITDjNM8_pF57taxshxwGg&priority=2&punit=yuan&region=2cea7bd8ee14aee7&t_mode=&ts=__TIMESTAMP__&ts_ms=__TIMESTAMP_MS__&type=impression&uid=&unit=dale_anonymous_homepage_right_top&vendor=Apple — 200 — 175 B — 159 ms — h2https://ssl.google-analytics.com/ga.jsssl.google-analytics.com/ga.js https://ssl.google-analytics.com/ga.js — 200 — 17.4 KiB — 98 ms — h2https://www.douban.com/favicon.icowww.douban.com/favicon.ico https://www.douban.com/favicon.ico — 200 — 5.7 KiB — 166 ms — h2https://ssl.google-analytics.com/r/__utm.gif?utmwv=5.7.2&utms=1&utmn=162116418&utmhn=www.douban.com&utme=8(responsive_view_mode)9(desktop)&utmcs=UTF-8&utmsr=800x600&utmvp=1350x940&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=%E8%B1%86%E7%93%A3&utmhid=180744646&utmr=-&utmp=%2F&utmht=1776800737260&utmac=UA-7019765-1&utmcc=__utma%3D30149280.1824037186.1776800737.1776800737.1776800737.1%3B%2B__utmz%3D30149280.1776800737.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=1909134992&utmredir=1&utmu=qRMAAA0GAAAAAAAAAAAAAAAE~ssl.google-analytics.com/r/__utm.gi... https://ssl.google-analytics.com/r/__utm.gif?utmwv=5.7.2&utms=1&utmn=162116418&utmhn=www.douban.com&utme=8(responsive_view_mode)9(desktop)&utmcs=UTF-8&utmsr=800x600&utmvp=1350x940&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=%E8%B1%86%E7%93%A3&utmhid=180744646&utmr=-&utmp=%2F&utmht=1776800737260&utmac=UA-7019765-1&utmcc=__utma%3D30149280.1824037186.1776800737.1776800737.1776800737.1%3B%2B__utmz%3D30149280.1776800737.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=1909134992&utmredir=1&utmu=qRMAAA0GAAAAAAAAAAAAAAAE~ — 200 — 440 B — 29 ms — h2
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 326ms · 15KB · ¥16/mo
www.douban.com
Other
Costly
Execution 237ms
Transfer 15 KB
Monthly Cost ¥12/mo
Unattributable
Other
Optional
Execution 88ms
Transfer 0 KB
Monthly Cost ¥4/mo

These scripts may cost more than they're worth

  • www.douban.com adds 237ms and costs ~¥12/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.douban.com takes 237ms 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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