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https://cas.cn

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
48
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
55
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
58
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
73
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.

890 ms

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

3.44 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.

0.627

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

7.30 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.

3.54 s

Page Load Progression

2.4 s
4.7 s
7.1 s
9.5 s
11.9 s
14.2 s
16.6 s
19.0 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
9.5 MB transferred, 138 requests
FIX
9.5 MB transferred, 138 requests
Critical::
Page weighs 9.6 MB (9.5 MB transferred)
Warning::
Images are 8.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 8.9 MB
Warning::
138 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.0 g CO2 per page load
9.5 MB / 2.4 MB budget
9.5 MB transferred
138 requests
2.0 g CO2 per page load
Images 8.9 MiB 93%
JavaScript 355.7 KiB 4%
CSS 185.7 KiB 2%
Other 82.6 KiB 1%
HTML 27.6 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

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 (9.5 MiB of 9.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
138 resources · 9.5 MB · 111 KB savings available
FIX
138 resources · 9.5 MB · 111 KB savings available
Warning::
Page weight 8.5 MB over 1MB target
Got: 9.5 MB Expected: ≤ 1 MB
Info::
~111 KB of savings available
Warning::
137 third-party resources (100% of weight)
Info::
18 resources over 200KB
138 resources · 9.5 MiB · 137 third-party 8.5 MiB over 1MB target
Image 94% · 9.0 MiB
JavaScript 4% · 355.7 KiB
CSS 2% · 185.7 KiB
Document 0% · 27.8 KiB
Other 0% · 0 B

~110.7 KiB of savings available

Remove unused JavaScript: 110.7 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
119 images, 0 KB saveable
REVIEW
119 images, 0 KB saveable
Warning::
https://www.cas.cn/images/z19_scroll_wb.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/gd/202603/W02026030345740740304... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/yjzxgl_202203826.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/dsb02_20251217.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/syky/202604/W020260421315832007... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/gd/202601/W02026012157654730503... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_ky1.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/zt1/202604/W0202604014100854603... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_gz2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_tj_img1.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_yw2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/jiucuo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_scroll_wx.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_video2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_tj.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/sygz/202604/W020260416563069960... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_xk2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_ft1.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_ky2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_tz2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/blue.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/zt1/202603/W0202603203785794845... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/dsb01_20251217.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_jl_img.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_ft2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/gd/202603/W02026030533953500338... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_video1.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_tz1.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/gd/202603/W02026030456261551947... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_yw1.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/gd/202603/W02026032036723787314... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_zt1.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/foot_jgawb.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_tj_img3.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_gz1.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/zt1/202604/W0202604014100815325... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/gd/202601/W02026012830508360370... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cas.cn/images/z19_index_xk1.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
119 images 8.9 MB
0 oversized -0 KB
119 legacy format
39 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

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

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

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

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 Execution Cost
675ms total JS execution
REVIEW
675ms total JS execution
Warning::
Unattributable: 425ms CPU time
Info::
https://www.cas.cn/: 249ms CPU time
Warning::
Third-party scripts: 675ms (100% of total)

Main Thread Breakdown

Other 67% Style & Layout 12% Rendering 11% Script Evaluation 6%
ScriptTotalScriptingParse/CompileParty
Unattributable425ms2ms0ms3rd
https://www.cas.cn/249ms8ms1ms3rd
B
JS Bundles
9 scripts, 111 KB unused
REVIEW
9 scripts, 111 KB unused
Warning::
https://www.cas.cn/images/swiper.min.js: 59 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.cas.cn/lib/js/jquery.min.js: 52 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 111 KB
111 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.cas.cn/images/swiper.min.js94 KB59 KB (62%)✓3rd
https://www.cas.cn/lib/js/jquery.min.js95 KB52 KB (55%)✓3rd
https://www.cas.cn/images/z19_h5.js2 KB—✓3rd
https://www.cas.cn/lib/js/plugin/swiper/idangerous.swiper.min.js44 KB—✓3rd
https://www.cas.cn/lib/js/plugin/jquery.cookie.js3 KB—✓3rd
https://www.cas.cn/images/z19_main.js?v=1.013 KB—✗3rd
https://www.cas.cn/images/z19_resize.js1 KB—✓3rd
https://www.cas.cn/lib/js/plugin/wza/esdtoolsinit.js101 KB—✓3rd
https://www.cas.cn/lib/js/plugin/topSide.min.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+
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
138 requests over 21358ms
INFO
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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 FCP 890 ms LCP 3.4 shttps://cas.cn// https://cas.cn/ — 301 — 178 B — 1.1 s — http/1.1http://www.cas.cn/www.cas.cn/ http://www.cas.cn/ — 307 — 0 B — 1 ms — http/1.1https://www.cas.cn/www.cas.cn/ https://www.cas.cn/ — 200 — 27.6 KiB — 1.6 s — http/1.1https://www.cas.cn/lib/js/plugin/swiper/swiper.min.csswww.cas.cn/lib/js/plugin/swiper/swi... https://www.cas.cn/lib/js/plugin/swiper/swiper.min.css — 200 — 19.5 KiB — 565 ms — http/1.1https://www.cas.cn/lib/css/hover.csswww.cas.cn/lib/css/hover.css https://www.cas.cn/lib/css/hover.css — 200 — 116.2 KiB — 1.5 s — http/1.1https://www.cas.cn/images/z19_public.css?v=20251218www.cas.cn/images/z19_public.css?v=... https://www.cas.cn/images/z19_public.css?v=20251218 — 200 — 24.6 KiB — 1.6 s — http/1.1https://www.cas.cn/images/z19_index.css?v=20251225www.cas.cn/images/z19_index.css?v=2... https://www.cas.cn/images/z19_index.css?v=20251225 — 200 — 13.2 KiB — 1.4 s — 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https://www.cas.cn/images/z19_school1.jpg — 200 — 8.0 KiB — 278 ms — http/1.1https://www.cas.cn/images/z19_school2.jpgwww.cas.cn/images/z19_school2.jpg https://www.cas.cn/images/z19_school2.jpg — 200 — 9.5 KiB — 294 ms — http/1.1https://www.cas.cn/images/z19_school3.jpgwww.cas.cn/images/z19_school3.jpg https://www.cas.cn/images/z19_school3.jpg — 200 — 10.3 KiB — 328 ms — http/1.1https://www.cas.cn/images/z19_school_bar1.jpgwww.cas.cn/images/z19_school_bar1.j... https://www.cas.cn/images/z19_school_bar1.jpg — 200 — 13.8 KiB — 324 ms — http/1.1https://www.cas.cn/images/z19_school_bar2.jpgwww.cas.cn/images/z19_school_bar2.j... https://www.cas.cn/images/z19_school_bar2.jpg — 200 — 11.7 KiB — 327 ms — http/1.1https://www.cas.cn/images/z19_school_bar3.jpgwww.cas.cn/images/z19_school_bar3.j... https://www.cas.cn/images/z19_school_bar3.jpg — 200 — 12.3 KiB — 333 ms — http/1.1https://www.cas.cn/kx/202404/W020240510574946875857_ORIGIN.jpgwww.cas.cn/kx/202404/W0202405105749... https://www.cas.cn/kx/202404/W020240510574946875857_ORIGIN.jpg — 200 — 43.9 KiB — 591 ms — http/1.1https://www.cas.cn/kx/202404/W020240510575174145626_ORIGIN.jpgwww.cas.cn/kx/202404/W0202405105751... https://www.cas.cn/kx/202404/W020240510575174145626_ORIGIN.jpg — 200 — 29.0 KiB — 376 ms — http/1.1https://www.cas.cn/images/z2025_dqgz1.jpgwww.cas.cn/images/z2025_dqgz1.jpg https://www.cas.cn/images/z2025_dqgz1.jpg — 200 — 37.9 KiB — 384 ms — http/1.1https://www.cas.cn/images/z19_dqgz2.jpgwww.cas.cn/images/z19_dqgz2.jpg https://www.cas.cn/images/z19_dqgz2.jpg — 200 — 37.4 KiB — 429 ms — http/1.1https://www.cas.cn/gd/202603/W020260304562615519478_ORIGIN.jpgwww.cas.cn/gd/202603/W0202603045626... https://www.cas.cn/gd/202603/W020260304562615519478_ORIGIN.jpg — 200 — 456.8 KiB — 2.2 s — http/1.1https://www.cas.cn/gd/202603/W020260320367237873144_ORIGIN.jpgwww.cas.cn/gd/202603/W0202603203672... https://www.cas.cn/gd/202603/W020260320367237873144_ORIGIN.jpg — 200 — 622.6 KiB — 3.1 s — http/1.1https://www.cas.cn/gd/202603/W020260320373519199299_ORIGIN.jpgwww.cas.cn/gd/202603/W0202603203735... https://www.cas.cn/gd/202603/W020260320373519199299_ORIGIN.jpg — 200 — 387.9 KiB — 2.0 s — http/1.1https://www.cas.cn/gd/202603/W020260303457407403045_ORIGIN.jpgwww.cas.cn/gd/202603/W0202603034574... https://www.cas.cn/gd/202603/W020260303457407403045_ORIGIN.jpg — 200 — 212.4 KiB — 1.2 s — http/1.1https://www.cas.cn/gd/202603/W020260303457407615596_ORIGIN.jpgwww.cas.cn/gd/202603/W0202603034574... https://www.cas.cn/gd/202603/W020260303457407615596_ORIGIN.jpg — 200 — 120.0 KiB — 1.4 s — http/1.1https://www.cas.cn/gd/202603/W020260305339535003381_ORIGIN.jpgwww.cas.cn/gd/202603/W0202603053395... https://www.cas.cn/gd/202603/W020260305339535003381_ORIGIN.jpg — 200 — 366.7 KiB — 1.9 s — http/1.1https://www.cas.cn/gd/202603/W020260305339535231140_ORIGIN.jpgwww.cas.cn/gd/202603/W0202603053395... https://www.cas.cn/gd/202603/W020260305339535231140_ORIGIN.jpg — 200 — 233.6 KiB — 1.7 s — http/1.1https://www.cas.cn/gd/202601/W020260128305083603703_ORIGIN.jpgwww.cas.cn/gd/202601/W0202601283050... https://www.cas.cn/gd/202601/W020260128305083603703_ORIGIN.jpg — 200 — 230.0 KiB — 2.0 s — http/1.1https://www.cas.cn/gd/202601/W020260128305083857947_ORIGIN.jpgwww.cas.cn/gd/202601/W0202601283050... https://www.cas.cn/gd/202601/W020260128305083857947_ORIGIN.jpg — 200 — 118.4 KiB — 792 ms — http/1.1https://www.cas.cn/gd/202601/W020260121576547305038_ORIGIN.jpgwww.cas.cn/gd/202601/W0202601215765... https://www.cas.cn/gd/202601/W020260121576547305038_ORIGIN.jpg — 200 — 123.3 KiB — 813 ms — http/1.1https://www.cas.cn/gj/202604/W020260421522038092312.pngwww.cas.cn/gj/202604/W0202604215220... https://www.cas.cn/gj/202604/W020260421522038092312.png — 200 — 350.4 KiB — 1.9 s — http/1.1https://www.cas.cn/cm/202604/W020260421385309959198.pngwww.cas.cn/cm/202604/W0202604213853... https://www.cas.cn/cm/202604/W020260421385309959198.png — 200 — 280.4 KiB — 1.5 s — http/1.1https://www.cas.cn/images/z19_index_gz1.pngwww.cas.cn/images/z19_index_gz1.png https://www.cas.cn/images/z19_index_gz1.png — 200 — 689 B — 272 ms — http/1.1https://www.cas.cn/images/z19_index_gz2.pngwww.cas.cn/images/z19_index_gz2.png https://www.cas.cn/images/z19_index_gz2.png — 200 — 727 B — 274 ms — http/1.1https://www.cas.cn/sygz/202604/W020260416563069960778.pngwww.cas.cn/sygz/202604/W02026041656... https://www.cas.cn/sygz/202604/W020260416563069960778.png — 200 — 267.7 KiB — 1.5 s — http/1.1https://www.cas.cn/yx/202603/W020260324417741201243.pngwww.cas.cn/yx/202603/W0202603244177... https://www.cas.cn/yx/202603/W020260324417741201243.png — 200 — 454.2 KiB — 2.5 s — http/1.1https://www.cas.cn/images/z19_index_zt1.pngwww.cas.cn/images/z19_index_zt1.png https://www.cas.cn/images/z19_index_zt1.png — 200 — 877 B — 281 ms — http/1.1https://www.cas.cn/zt1/202604/W020260401410085460301.jpgwww.cas.cn/zt1/202604/W020260401410... https://www.cas.cn/zt1/202604/W020260401410085460301.jpg — 200 — 94.8 KiB — 1.2 s — http/1.1https://www.cas.cn/zt1/202604/W020260401410081532588.jpgwww.cas.cn/zt1/202604/W020260401410... https://www.cas.cn/zt1/202604/W020260401410081532588.jpg — 200 — 82.5 KiB — 980 ms — http/1.1https://www.cas.cn/zt1/202603/W020260320378579484579.jpgwww.cas.cn/zt1/202603/W020260320378... https://www.cas.cn/zt1/202603/W020260320378579484579.jpg — 200 — 88.3 KiB — 721 ms — http/1.1https://www.cas.cn/images/z19_jl_img.pngwww.cas.cn/images/z19_jl_img.png https://www.cas.cn/images/z19_jl_img.png — 200 — 919 B — 277 ms — http/1.1https://www.cas.cn/images/zjzkypc_202303.jpgwww.cas.cn/images/zjzkypc_202303.jp... https://www.cas.cn/images/zjzkypc_202303.jpg — 200 — 47.3 KiB — 594 ms — http/1.1https://www.cas.cn/images/zjzkymob_202303.jpgwww.cas.cn/images/zjzkymob_202303.j... https://www.cas.cn/images/zjzkymob_202303.jpg — 200 — 86.4 KiB — 696 ms — http/1.1https://www.cas.cn/images/zjxbpc_202303.jpgwww.cas.cn/images/zjxbpc_202303.jpg https://www.cas.cn/images/zjxbpc_202303.jpg — 200 — 34.5 KiB — 485 ms — http/1.1https://www.cas.cn/images/zjxbmob_202303.jpgwww.cas.cn/images/zjxbmob_202303.jp... https://www.cas.cn/images/zjxbmob_202303.jpg — 200 — 70.6 KiB — 1.1 s — http/1.1https://www.cas.cn/images/zkyzsmob_202303.jpgwww.cas.cn/images/zkyzsmob_202303.j... https://www.cas.cn/images/zkyzsmob_202303.jpg — 200 — 38.8 KiB — 427 ms — http/1.1https://www.cas.cn/images/z19_index_tz1.pngwww.cas.cn/images/z19_index_tz1.png https://www.cas.cn/images/z19_index_tz1.png — 200 — 1.2 KiB — 277 ms — http/1.1https://www.cas.cn/images/z19_index_tz2.pngwww.cas.cn/images/z19_index_tz2.png https://www.cas.cn/images/z19_index_tz2.png — 200 — 1.7 KiB — 274 ms — http/1.1https://www.cas.cn/images/z19_index_video1.pngwww.cas.cn/images/z19_index_video1.... https://www.cas.cn/images/z19_index_video1.png — 200 — 1.0 KiB — 277 ms — http/1.1https://www.cas.cn/images/z19_index_video2.pngwww.cas.cn/images/z19_index_video2.... https://www.cas.cn/images/z19_index_video2.png — 200 — 1020 B — 278 ms — http/1.1https://www.cas.cn/spx/202604/W020260420379180266731_ORIGIN.jpgwww.cas.cn/spx/202604/W020260420379... https://www.cas.cn/spx/202604/W020260420379180266731_ORIGIN.jpg — 200 — 217.0 KiB — 1.3 s — http/1.1https://www.cas.cn/images/z19_video_play.pngwww.cas.cn/images/z19_video_play.pn... https://www.cas.cn/images/z19_video_play.png — 200 — 1.9 KiB — 275 ms — http/1.1https://www.cas.cn/spx/202604/W020260418314827276324_ORIGIN.jpgwww.cas.cn/spx/202604/W020260418314... https://www.cas.cn/spx/202604/W020260418314827276324_ORIGIN.jpg — 200 — 115.0 KiB — 756 ms — http/1.1https://www.cas.cn/spx/202604/W020260417530461254188_ORIGIN.jpgwww.cas.cn/spx/202604/W020260417530... https://www.cas.cn/spx/202604/W020260417530461254188_ORIGIN.jpg — 200 — 206.3 KiB — 1.2 s — http/1.1https://www.cas.cn/newmedia/dsp/202604/W020260421276040437486.jpgwww.cas.cn/newmedia/dsp/202604/W020... https://www.cas.cn/newmedia/dsp/202604/W020260421276040437486.jpg — 200 — 23.5 KiB — 373 ms — http/1.1https://www.cas.cn/newmedia/dsp/202604/W020260420329652831168.pngwww.cas.cn/newmedia/dsp/202604/W020... https://www.cas.cn/newmedia/dsp/202604/W020260420329652831168.png — 200 — 269.6 KiB — 2.6 s — http/1.1https://www.cas.cn/newmedia/dsp/202604/W020260421546988627746.pngwww.cas.cn/newmedia/dsp/202604/W020... https://www.cas.cn/newmedia/dsp/202604/W020260421546988627746.png — 200 — 167.1 KiB — 1.7 s — http/1.1https://www.cas.cn/images/z19_index_xk2.pngwww.cas.cn/images/z19_index_xk2.png https://www.cas.cn/images/z19_index_xk2.png — 200 — 1.4 KiB — 274 ms — http/1.1https://www.cas.cn/images/z19_index_xk1.pngwww.cas.cn/images/z19_index_xk1.png https://www.cas.cn/images/z19_index_xk1.png — 200 — 2.0 KiB — 278 ms — http/1.1https://www.cas.cn/images/z19_index_ft1.pngwww.cas.cn/images/z19_index_ft1.png https://www.cas.cn/images/z19_index_ft1.png — 200 — 1.0 KiB — 276 ms — http/1.1https://www.cas.cn/images/z19_index_ft2.pngwww.cas.cn/images/z19_index_ft2.png https://www.cas.cn/images/z19_index_ft2.png — 200 — 750 B — 278 ms — http/1.1https://www.cas.cn/images/20230731zcjd.jpgwww.cas.cn/images/20230731zcjd.jpg https://www.cas.cn/images/20230731zcjd.jpg — 200 — 129.0 KiB — 1.2 s — http/1.1https://www.cas.cn/images/z19_jl_icon2.pngwww.cas.cn/images/z19_jl_icon2.png https://www.cas.cn/images/z19_jl_icon2.png — 200 — 4.6 KiB — 277 ms — http/1.1https://www.cas.cn/images/z19_jl_icon4.pngwww.cas.cn/images/z19_jl_icon4.png https://www.cas.cn/images/z19_jl_icon4.png — 200 — 5.2 KiB — 289 ms — http/1.1https://www.cas.cn/images/z19_jl_icon5.pngwww.cas.cn/images/z19_jl_icon5.png https://www.cas.cn/images/z19_jl_icon5.png — 200 — 3.7 KiB — 279 ms — http/1.1https://www.cas.cn/images/z22_jl_xfqd.pngwww.cas.cn/images/z22_jl_xfqd.png https://www.cas.cn/images/z22_jl_xfqd.png — 200 — 5.3 KiB — 277 ms — http/1.1https://www.cas.cn/images/z19_index_tj.pngwww.cas.cn/images/z19_index_tj.png https://www.cas.cn/images/z19_index_tj.png — 200 — 1.6 KiB — 278 ms — http/1.1https://www.cas.cn/images/z19_tj_img3.jpgwww.cas.cn/images/z19_tj_img3.jpg https://www.cas.cn/images/z19_tj_img3.jpg — 200 — 15.2 KiB — 427 ms — http/1.1https://www.cas.cn/images/z19_tj_img1.jpgwww.cas.cn/images/z19_tj_img1.jpg https://www.cas.cn/images/z19_tj_img1.jpg — 200 — 53.2 KiB — 478 ms — http/1.1https://www.cas.cn/images/yjzxgl_202203826.jpgwww.cas.cn/images/yjzxgl_202203826.... https://www.cas.cn/images/yjzxgl_202203826.jpg — 200 — 21.4 KiB — 473 ms — http/1.1https://www.cas.cn/images/z19_ewm3.jpgwww.cas.cn/images/z19_ewm3.jpg https://www.cas.cn/images/z19_ewm3.jpg — 200 — 215.4 KiB — 2.4 s — http/1.1https://www.cas.cn/images/z19_scroll_top.pngwww.cas.cn/images/z19_scroll_top.pn... https://www.cas.cn/images/z19_scroll_top.png — 200 — 1.1 KiB — 288 ms — http/1.1https://www.cas.cn/images/z19_return_m.pngwww.cas.cn/images/z19_return_m.png https://www.cas.cn/images/z19_return_m.png — 200 — 3.0 KiB — 278 ms — http/1.1https://www.cas.cn/images/foot_jgawb.pngwww.cas.cn/images/foot_jgawb.png https://www.cas.cn/images/foot_jgawb.png — 200 — 1.6 KiB — 278 ms — http/1.1https://www.cas.cn/images/jiucuo.pngwww.cas.cn/images/jiucuo.png https://www.cas.cn/images/jiucuo.png — 200 — 4.1 KiB — 274 ms — http/1.1https://www.cas.cn/images/blue.pngwww.cas.cn/images/blue.png https://www.cas.cn/images/blue.png — 200 — 2.5 KiB — 278 ms — http/1.1https://www.cas.cn/images/z19_gopc.pngwww.cas.cn/images/z19_gopc.png https://www.cas.cn/images/z19_gopc.png — 200 — 4.4 KiB — 278 ms — http/1.1https://www.cas.cn/images/z19_bg_blue.pngwww.cas.cn/images/z19_bg_blue.png https://www.cas.cn/images/z19_bg_blue.png — 200 — 539 B — 280 ms — http/1.1https://www.cas.cn/images/z19_xk_tab_pad.pngwww.cas.cn/images/z19_xk_tab_pad.pn... https://www.cas.cn/images/z19_xk_tab_pad.png — 200 — 1.3 KiB — 276 ms — http/1.1https://www.cas.cn/images/z19_bg_blue2.pngwww.cas.cn/images/z19_bg_blue2.png https://www.cas.cn/images/z19_bg_blue2.png — 200 — 1.2 KiB — 278 ms — http/1.1https://www.cas.cn/images/z19_jl_bg.jpgwww.cas.cn/images/z19_jl_bg.jpg https://www.cas.cn/images/z19_jl_bg.jpg — 200 — 1.7 KiB — 278 ms — http/1.1https://www.cas.cn/images/z19_foot_m.jpgwww.cas.cn/images/z19_foot_m.jpg https://www.cas.cn/images/z19_foot_m.jpg — 200 — 122.8 KiB — 2.2 s — http/1.1https://www.cas.cn/images/z19_xk_tab.pngwww.cas.cn/images/z19_xk_tab.png https://www.cas.cn/images/z19_xk_tab.png — 200 — 485 B — 277 ms — http/1.1https://www.cas.cn/images/z19_foot.pngwww.cas.cn/images/z19_foot.png https://www.cas.cn/images/z19_foot.png — 200 — 208.7 KiB — 1.9 s — http/1.1https://www.cas.cn/lib/images/favicon.icowww.cas.cn/lib/images/favicon.ico https://www.cas.cn/lib/images/favicon.ico — 200 — 82.4 KiB — 1.1 s — http/1.1
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 675ms · 28KB · ¥33/mo
Unattributable
Other
Costly
Execution 425ms
Transfer 0 KB
Monthly Cost ¥21/mo
www.cas.cn
Other
Costly
Execution 249ms
Transfer 28 KB
Monthly Cost ¥12/mo

These scripts may cost more than they're worth

  • Unattributable adds 425ms and costs ~¥21/month
  • www.cas.cn adds 249ms 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

Unattributable takes 425ms 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.cas.cn takes 249ms 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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