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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
3
REVIEW
3
PASS
9
INFO
2

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

Mobile Desktop
55
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
69
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.
82
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.

2.59 s

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

30.44 s

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

65 ms

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

0.153

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

21.67 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.

30.44 s

Page Load Progression

5.6 s
11.1 s
16.7 s
22.3 s
27.9 s
33.4 s
39.0 s
44.6 s
Checks
17
9 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
23.9 MB transferred, 82 requests
FIX
23.9 MB transferred, 82 requests
Critical::
Page weighs 24.5 MB (23.9 MB transferred)
Warning::
Images are 23.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 23.7 MB
Info::
82 HTTP requests
Info::
Estimated 5.0 g CO2 per page load
23.9 MB / 2.4 MB budget
23.9 MB transferred
82 requests
5.0 g CO2 per page load
Images 23.7 MiB 99%
JavaScript 119.2 KiB 0%
Fonts 39.9 KiB 0%
CSS 37.4 KiB 0%
HTML 21.1 KiB 0%
Other 10.4 KiB 0%
0 2.4 MB 4.9 MB
Over budget

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

F
JS Execution Cost
Action
8528ms total JS execution
FIX
8528ms total JS execution
Warning::
https://www.pku.edu.cn/: 6331ms CPU time
Warning::
Unattributable: 1346ms CPU time
Warning::
https://www.pku.edu.cn/Public/static/themes/js/jqu...: 427ms CPU time
Warning::
https://www.pku.edu.cn/Public/static/themes/js/jqu...: 425ms CPU time
Info::
Third-party scripts: 1346ms (16% of total)

Main Thread Breakdown

Other 49% Rendering 20% Style & Layout 20% Script Evaluation 10%
ScriptTotalScriptingParse/CompileParty
https://www.pku.edu.cn/6331ms181ms5ms1st
Unattributable1346ms2ms0ms3rd
https://www.pku.edu.cn/Public/static/themes/js/jquery.mCustomScrollbar.js427ms379ms7ms1st
https://www.pku.edu.cn/Public/static/themes/js/jquery.js425ms256ms9ms1st
D
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.
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
49 images, 0 KB saveable
REVIEW
49 images, 0 KB saveable
Warning::
https://www.pku.edu.cn/Uploads/Picture/2019/12/27/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pku.edu.cn/Uploads/Picture/2019/12/31/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pku.edu.cn/dat/img/85d41f2c3212461b885... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pku.edu.cn/Uploads/Picture/2019/12/05/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pku.edu.cn/Uploads/Picture/2019/12/26/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pku.edu.cn/dat/img/4bdf82f5e8a24fcc9b4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pku.edu.cn/Uploads/Picture/2019/12/08/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pku.edu.cn/dat/img/15e75d5f2c624be9a8c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
49 images 23.7 MB
0 oversized -0 KB
46 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

Performance issues directly impact user engagement and conversion rates.

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
Page Weight Inventory
Action
82 resources · 23.9 MB · 0 KB savings available
REVIEW
82 resources · 23.9 MB · 0 KB savings available
Warning::
Page weight 22.9 MB over 1MB target
Got: 23.9 MB Expected: ≤ 1 MB
Info::
7 third-party resources (0% of weight)
Info::
17 resources over 200KB
82 resources · 23.9 MiB · 7 third-party 22.9 MiB over 1MB target
Image 99% · 23.7 MiB
JavaScript 0% · 119.2 KiB
Font 0% · 39.9 KiB
CSS 0% · 37.4 KiB
Document 0% · 21.1 KiB
Other 0% · 10.4 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
0% third-party, 0 ms blocking
PASS
0% third-party, 0 ms blocking
Info::
Third-party code accounts for 0% of page weight (4.3 KiB of 23.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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 (40 KB)
PASS
1 fonts (40 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

40 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 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s FCP 2.6 s LCP 30.4 shttps://www.pku.edu.cn/Public/static/themes/css/fonts/iconfont.wofficonfont.woff https://www.pku.edu.cn/Public/static/themes/css/fonts/iconfont.woff — 39.9 KiB — 576 ms — font-display: swap
iconfont.woff woff swap
Size 40 KB
Load time 576 ms
Start 2.8 s
Risk FOUT — 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 ~12 KB and ~24 ms

A+
JS Bundles
15 scripts, 0 KB unused
PASS
15 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.pku.edu.cn/Public/static/themes/js/jquery.js33 KB—✓1st
https://www.pku.edu.cn/Public/static/themes/js/jquery.easing.js1 KB—✓1st
https://www.pku.edu.cn/Public/static/themes/js/jquery.mousewheel.js1 KB—✓1st
https://www.pku.edu.cn/Public/static/themes/js/global.js3 KB—✓1st
https://www.pku.edu.cn/Public/static/themes/js/fun.js6 KB—✓1st
https://www.pku.edu.cn/Public/static/themes/js/plus/old/winscreen.js2 KB—✓1st
https://www.pku.edu.cn/Public/static/themes/js/plus/jquery.mChange.js2 KB—✓1st
https://www.pku.edu.cn/Public/static/themes/js/plus/jquery.mScroll.js5 KB—✗1st
https://www.pku.edu.cn/Public/static/themes/js/plus/vivus.js9 KB—✗1st
https://www.pku.edu.cn/Public/static/themes/js/jquery.mCustomScrollbar.js22 KB—✗1st
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
82 requests over 37675ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s FCP 2.6 s LCP 30.4 shttps://www.pku.edu.cn// https://www.pku.edu.cn/ — 200 — 21.1 KiB — 1.1 s — http/1.1https://www.pku.edu.cn/Public/static/themes/css/jquery.mCustomScrollbar.css/Public/static/themes/css/jquery.mC... https://www.pku.edu.cn/Public/static/themes/css/jquery.mCustomScrollbar.css — 200 — 2.7 KiB — 274 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/css/global.css/Public/static/themes/css/global.cs... https://www.pku.edu.cn/Public/static/themes/css/global.css — 200 — 22.8 KiB — 863 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/css/fix.css/Public/static/themes/css/fix.css https://www.pku.edu.cn/Public/static/themes/css/fix.css — 200 — 11.0 KiB — 331 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/js/jquery.js/Public/static/themes/js/jquery.js https://www.pku.edu.cn/Public/static/themes/js/jquery.js — 200 — 33.1 KiB — 978 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/js/jquery.easing.js/Public/static/themes/js/jquery.eas... https://www.pku.edu.cn/Public/static/themes/js/jquery.easing.js — 200 — 1.2 KiB — 815 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/js/jquery.mousewheel.js/Public/static/themes/js/jquery.mou... https://www.pku.edu.cn/Public/static/themes/js/jquery.mousewheel.js — 200 — 1.1 KiB — 817 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/js/global.js/Public/static/themes/js/global.js https://www.pku.edu.cn/Public/static/themes/js/global.js — 200 — 2.8 KiB — 833 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/js/fun.js/Public/static/themes/js/fun.js https://www.pku.edu.cn/Public/static/themes/js/fun.js — 200 — 5.9 KiB — 843 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/js/plus/old/winscreen.js/Public/static/themes/js/plus/old/w... https://www.pku.edu.cn/Public/static/themes/js/plus/old/winscreen.js — 200 — 1.7 KiB — 1.6 s — http/1.1https://www.pku.edu.cn/Public/static/themes/js/plus/jquery.mChange.js/Public/static/themes/js/plus/jquer... https://www.pku.edu.cn/Public/static/themes/js/plus/jquery.mChange.js — 200 — 1.8 KiB — 1.1 s — http/1.1https://www.pku.edu.cn/Public/static/themes/js/plus/jquery.mScroll.js/Public/static/themes/js/plus/jquer... https://www.pku.edu.cn/Public/static/themes/js/plus/jquery.mScroll.js — 200 — 4.8 KiB — 1.1 s — http/1.1https://www.pku.edu.cn/Public/static/themes/js/plus/vivus.js/Public/static/themes/js/plus/vivus... https://www.pku.edu.cn/Public/static/themes/js/plus/vivus.js — 200 — 8.7 KiB — 1.1 s — http/1.1https://www.pku.edu.cn/Public/static/themes/js/jquery.mCustomScrollbar.js/Public/static/themes/js/jquery.mCu... https://www.pku.edu.cn/Public/static/themes/js/jquery.mCustomScrollbar.js — 200 — 22.2 KiB — 1.4 s — http/1.1https://www.pku.edu.cn/Public/static/themes/js/iscroll.js/Public/static/themes/js/iscroll.js https://www.pku.edu.cn/Public/static/themes/js/iscroll.js — 200 — 12.8 KiB — 1.3 s — http/1.1https://www.pku.edu.cn/Public/static/themes/css/slick.css/Public/static/themes/css/slick.css https://www.pku.edu.cn/Public/static/themes/css/slick.css — 200 — 848 B — 539 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/js/slick.js/Public/static/themes/js/slick.js https://www.pku.edu.cn/Public/static/themes/js/slick.js — 200 — 15.7 KiB — 1.6 s — http/1.1https://www.pku.edu.cn/Uploads/Picture/2019/12/26/s5e04147ee4a83.png/Uploads/Picture/2019/12/26/s5e0414... https://www.pku.edu.cn/Uploads/Picture/2019/12/26/s5e04147ee4a83.png — 200 — 28.6 KiB — 556 ms — http/1.1https://www.pku.edu.cn/Uploads/Picture/2024/11/06/s672b1d5a8248e.jpg/Uploads/Picture/2024/11/06/s672b1d... https://www.pku.edu.cn/Uploads/Picture/2024/11/06/s672b1d5a8248e.jpg — 200 — 232.3 KiB — 1.4 s — http/1.1https://www.pku.edu.cn/Uploads/Picture/2025/09/08/s68beb6ab0f45e.jpg/Uploads/Picture/2025/09/08/s68beb6... https://www.pku.edu.cn/Uploads/Picture/2025/09/08/s68beb6ab0f45e.jpg — 200 — 27.2 KiB — 1.1 s — http/1.1https://www.pku.edu.cn/Uploads/Picture/2022/11/02/s6362348db2897.png/Uploads/Picture/2022/11/02/s636234... https://www.pku.edu.cn/Uploads/Picture/2022/11/02/s6362348db2897.png — 200 — 543.5 KiB — 2.2 s — http/1.1https://www.pku.edu.cn/Uploads/Picture/2025/09/15/s68c789787fad6.jpg/Uploads/Picture/2025/09/15/s68c789... https://www.pku.edu.cn/Uploads/Picture/2025/09/15/s68c789787fad6.jpg — 200 — 125.3 KiB — 3.4 s — http/1.1https://www.pku.edu.cn/Public/static/themes/js/homeJson.js/Public/static/themes/js/homeJson.j... https://www.pku.edu.cn/Public/static/themes/js/homeJson.js — 200 — 2.2 KiB — 321 ms — http/1.1https://pkujkv.pku.edu.cn/collector/statistic.js?channelId=&channelName=&articleId=&articleName=pkujkv.pku.edu.cn/collector/statist... https://pkujkv.pku.edu.cn/collector/statistic.js?channelId=&channelName=&articleId=&articleName= — 200 — 3.5 KiB — 1.2 s — http/1.1data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPHN2ZyB2ZXJzaW9uPSIxL…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPHN2ZyB2ZXJzaW9uPSIxL… — 200 — 0 B — 0 ms — datahttps://www.pku.edu.cn/Uploads/Picture/2026/03/31/s69cb7d26ba8a5.jpg/Uploads/Picture/2026/03/31/s69cb7d... https://www.pku.edu.cn/Uploads/Picture/2026/03/31/s69cb7d26ba8a5.jpg — 200 — 2.0 MiB — 277 ms — http/1.1https://www.pku.edu.cn/Uploads/Picture/2026/04/02/s69cdfe602790e.jpg/Uploads/Picture/2026/04/02/s69cdfe... https://www.pku.edu.cn/Uploads/Picture/2026/04/02/s69cdfe602790e.jpg — 200 — 2.1 MiB — 2.2 s — http/1.1https://www.pku.edu.cn/Uploads/Picture/2026/04/17/s69e1c2a2f1019.jpg/Uploads/Picture/2026/04/17/s69e1c2... https://www.pku.edu.cn/Uploads/Picture/2026/04/17/s69e1c2a2f1019.jpg — 200 — 2.0 MiB — 33.5 s — http/1.1https://www.pku.edu.cn/Uploads/Picture/2026/04/09/s69d759af9ca1b.jpg/Uploads/Picture/2026/04/09/s69d759... https://www.pku.edu.cn/Uploads/Picture/2026/04/09/s69d759af9ca1b.jpg — 200 — 1.4 MiB — 34.0 s — http/1.1https://www.pku.edu.cn/Public/static/themes/image/png27.png/Public/static/themes/image/png27.p... https://www.pku.edu.cn/Public/static/themes/image/png27.png — 200 — 9.5 KiB — 2.9 s — http/1.1
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s FCP 2.6 s LCP 30.4 shttps://www.pku.edu.cn// https://www.pku.edu.cn/ — 200 — 21.1 KiB — 1.1 s — http/1.1https://www.pku.edu.cn/Public/static/themes/css/jquery.mCustomScrollbar.css/Public/static/themes/css/jquery.mC... https://www.pku.edu.cn/Public/static/themes/css/jquery.mCustomScrollbar.css — 200 — 2.7 KiB — 274 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/css/global.css/Public/static/themes/css/global.cs... https://www.pku.edu.cn/Public/static/themes/css/global.css — 200 — 22.8 KiB — 863 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/css/fix.css/Public/static/themes/css/fix.css https://www.pku.edu.cn/Public/static/themes/css/fix.css — 200 — 11.0 KiB — 331 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/js/jquery.js/Public/static/themes/js/jquery.js https://www.pku.edu.cn/Public/static/themes/js/jquery.js — 200 — 33.1 KiB — 978 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/js/jquery.easing.js/Public/static/themes/js/jquery.eas... https://www.pku.edu.cn/Public/static/themes/js/jquery.easing.js — 200 — 1.2 KiB — 815 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/js/jquery.mousewheel.js/Public/static/themes/js/jquery.mou... https://www.pku.edu.cn/Public/static/themes/js/jquery.mousewheel.js — 200 — 1.1 KiB — 817 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/js/global.js/Public/static/themes/js/global.js https://www.pku.edu.cn/Public/static/themes/js/global.js — 200 — 2.8 KiB — 833 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/js/fun.js/Public/static/themes/js/fun.js https://www.pku.edu.cn/Public/static/themes/js/fun.js — 200 — 5.9 KiB — 843 ms — http/1.1https://www.pku.edu.cn/Public/static/themes/js/plus/old/winscreen.js/Public/static/themes/js/plus/old/w... https://www.pku.edu.cn/Public/static/themes/js/plus/old/winscreen.js — 200 — 1.7 KiB — 1.6 s — 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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
16% of JavaScript execution is third-party
First-party Third-party 1346ms · 0KB · ¥66/mo
Unattributable
Other
Costly
Execution 1346ms
Transfer 0 KB
Monthly Cost ¥66/mo

These scripts may cost more than they're worth

  • Unattributable adds 1346ms and costs ~¥66/month

Unattributable takes 1346ms 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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