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https://bt.cn

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
58
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
75
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
69
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

4.13 s

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

7.95 s

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

117 ms

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

0.020

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

9.18 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.

7.95 s

Page Load Progression

987 ms
2.0 s
3.0 s
3.9 s
4.9 s
5.9 s
6.9 s
7.9 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
4.6 MB transferred, 52 requests
FIX
4.6 MB transferred, 52 requests
Critical::
Page weighs 5.1 MB (4.6 MB transferred)
Warning::
Images are 4.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.3 MB
Info::
52 HTTP requests
Info::
Estimated 0.97 g CO2 per page load
4.6 MB / 2.4 MB budget
4.6 MB transferred
52 requests
0.97 g CO2 per page load
Images 4.3 MiB 92%
JavaScript 177.4 KiB 4%
Fonts 111.0 KiB 2%
CSS 56.9 KiB 1%
HTML 20.3 KiB 0%
Other 4.9 KiB 0%
Other 1.3 KiB 0%
Other 120 B 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

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 (4.6 MiB of 4.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3801ms total JS execution
FIX
3801ms total JS execution
Warning::
https://www.bt.cn/new/index.html: 2990ms CPU time
Warning::
Unattributable: 346ms CPU time
Warning::
https://scripts.clarity.ms/0.8.59/clarity.js: 284ms CPU time
Info::
https://hm.baidu.com/hm.js?6e78ef648057d9f2ab12dcc...: 64ms CPU time
Info::
https://bat.bing.com/bat.js?version=1776821593: 59ms CPU time
Warning::
Third-party scripts: 3801ms (100% of total)

Main Thread Breakdown

Other 32% Rendering 27% Style & Layout 26% Script Evaluation 13%
ScriptTotalScriptingParse/CompileParty
https://www.bt.cn/new/index.html2990ms44ms5ms3rd
Unattributable346ms7ms0ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js284ms252ms8ms3rd
https://hm.baidu.com/hm.js?6e78ef648057d9f2ab12dcc287b440f664ms54ms4ms3rd
https://bat.bing.com/bat.js?version=177682159359ms48ms5ms3rd
https://www.bt.cn/static/astro/js/Layout.astro_astro_type_script_index_0_lang.js?version=177682159358ms49ms0ms3rd
D
Page Weight Inventory
Action
52 resources · 4.6 MB · 77 KB savings available
FIX
52 resources · 4.6 MB · 77 KB savings available
Warning::
Page weight 3.6 MB over 1MB target
Got: 4.6 MB Expected: ≤ 1 MB
Info::
~77 KB of savings available
Warning::
51 third-party resources (100% of weight)
Info::
4 resources over 200KB
52 resources · 4.6 MiB · 51 third-party 3.6 MiB over 1MB target
Image 92% · 4.3 MiB
JavaScript 4% · 177.4 KiB
Font 2% · 111.0 KiB
CSS 1% · 56.9 KiB
Document 0% · 20.8 KiB
Other 0% · 1.4 KiB

~76.9 KiB of savings available

Remove unused JavaScript: 76.9 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
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Warning::
https://www.bt.cn/static/astro/images/home/step/pa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bt.cn/static/astro/images/home/free-ic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bt.cn/static/astro/images/trust/fuli.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bt.cn/static/astro/images/trust/xiehui... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bt.cn/static/astro/images/trust/yanjiu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bt.cn/static/astro/images/home/step/co... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bt.cn/static/astro/images/home/step/do... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bt.cn/static/astro/images/trust/hunan.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
26 images 4.3 MB
0 oversized -0 KB
26 legacy format
8 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

B
JS Bundles
14 scripts, 77 KB unused
REVIEW
14 scripts, 77 KB unused
Warning::
https://www.bt.cn/static/astro/js/utils-vendor.js?...: 41 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.bt.cn/static/astro/js/vue-vendor.js?ve...: 35 KB unused (92%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 77 KB
77 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.bt.cn/static/astro/js/utils-vendor.js?version=177682159361 KB41 KB (69%)✓3rd
https://www.bt.cn/static/astro/js/vue-vendor.js?version=177682159339 KB35 KB (92%)✓3rd
https://www.bt.cn/static/astro/js/StoryCarousel.astro_astro_type_script_index_0_lang.js?version=17768215933 KB—✓3rd
https://bat.bing.com/bat.js?version=177682159315 KB—✓3rd
https://bat.bing.com/p/action/97128650.js2 KB—✓3rd
https://www.clarity.ms/tag/uet/97128650?insights=11 KB—✓3rd
https://scripts.clarity.ms/0.8.59/clarity.js26 KB—✓3rd
https://www.bt.cn/static/astro/js/Layout.astro_astro_type_script_index_0_lang.js?version=17768215936 KB—✓3rd
https://www.bt.cn/static/astro/js/Header.astro_astro_type_script_index_0_lang.js?version=17768215931 KB—✓3rd
https://hm.baidu.com/hm.js?6e78ef648057d9f2ab12dcc287b440f620 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
1 fonts (111 KB)
PASS
1 fonts (111 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

111 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 4.1 s LCP 7.9 shttps://www.bt.cn/static/astro/woff2/fa-solid-900.woff2fa-solid-900.woff2 https://www.bt.cn/static/astro/woff2/fa-solid-900.woff2 — 111.0 KiB — 569 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 111 KB
Load time 569 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~55 KB and ~110 ms

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
52 requests over 7132ms
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 FCP 4.1 s LCP 7.9 shttps://bt.cn// https://bt.cn/ — 302 — 107 B — 747 ms — h2https://www.bt.cn/www.bt.cn/ https://www.bt.cn/ — 302 — 321 B — 705 ms — h2https://www.bt.cn/new/index.htmlwww.bt.cn/new/index.html https://www.bt.cn/new/index.html — 200 — 20.3 KiB — 509 ms — h2https://bat.bing.com/bat.js?version=1776821593bat.bing.com/bat.js?version=1776821... https://bat.bing.com/bat.js?version=1776821593 — 200 — 15.5 KiB — 115 ms — h2https://hm.baidu.com/hm.js?6e78ef648057d9f2ab12dcc287b440f6hm.baidu.com/hm.js?6e78ef648057d9f2... https://hm.baidu.com/hm.js?6e78ef648057d9f2ab12dcc287b440f6 — 200 — 19.6 KiB — 1.4 s — http/1.1https://www.bt.cn/static/astro/css/index.css?version=1776821593www.bt.cn/static/astro/css/index.cs... https://www.bt.cn/static/astro/css/index.css?version=1776821593 — 200 — 3.2 KiB — 218 ms — h2https://www.bt.cn/static/astro/css/1111-1.css?version=1776821593www.bt.cn/static/astro/css/1111-1.c... https://www.bt.cn/static/astro/css/1111-1.css?version=1776821593 — 200 — 53.6 KiB — 435 ms — h2https://www.bt.cn/static/astro/icon/logo.svgwww.bt.cn/static/astro/icon/logo.sv... https://www.bt.cn/static/astro/icon/logo.svg — 200 — 47.2 KiB — 646 ms — h2https://www.bt.cn/static/astro/js/Header.astro_astro_type_script_index_0_lang.js?version=1776821593www.bt.cn/static/astro/js/Header.as... https://www.bt.cn/static/astro/js/Header.astro_astro_type_script_index_0_lang.js?version=1776821593 — 200 — 558 B — 435 ms — h2https://www.bt.cn/static/astro/images/home/free-icon.pngwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/free-icon.png — 200 — 3.2 KiB — 438 ms — h2https://www.bt.cn/static/astro/images/home/banner-1/banner-bg-1.pngwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/banner-1/banner-bg-1.png — 200 — 274.3 KiB — 1.1 s — h2https://www.bt.cn/static/astro/images/home/banner-1/bt_video.gifwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/banner-1/bt_video.gif — 200 — 2.7 MiB — 3.1 s — h2https://www.bt.cn/static/astro/images/decoration/panel-pc.pngwww.bt.cn/static/astro/images/decor... https://www.bt.cn/static/astro/images/decoration/panel-pc.png — 200 — 12.5 KiB — 858 ms — h2https://www.bt.cn/static/astro/images/home/banner-1/banner-bg-2.pngwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/banner-1/banner-bg-2.png — 200 — 228.5 KiB — 1.3 s — h2https://www.bt.cn/static/astro/images/home/banner-1/banner-domain-overview.pngwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/banner-1/banner-domain-overview.png — 200 — 167.7 KiB — 1.3 s — h2https://www.bt.cn/static/astro/images/home/banner-1/banner-bg-3.pngwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/banner-1/banner-bg-3.png — 200 — 314.7 KiB — 3.0 s — h2https://www.bt.cn/static/astro/images/home/banner-1/banner-ssl-overview.pngwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/banner-1/banner-ssl-overview.png — 200 — 97.3 KiB — 2.8 s — h2https://www.bt.cn/static/astro/js/StoryCarousel.astro_astro_type_script_index_0_lang.js?version=1776821593www.bt.cn/static/astro/js/StoryCaro... https://www.bt.cn/static/astro/js/StoryCarousel.astro_astro_type_script_index_0_lang.js?version=1776821593 — 200 — 3.2 KiB — 434 ms — h2https://bat.bing.com/p/action/97128650.jsbat.bing.com/p/action/97128650.js https://bat.bing.com/p/action/97128650.js — 200 — 1.8 KiB — 36 ms — h2https://www.clarity.ms/tag/uet/97128650?insights=1www.clarity.ms/tag/uet/97128650?ins... https://www.clarity.ms/tag/uet/97128650?insights=1 — 200 — 1.0 KiB — 163 ms — http/1.1https://scripts.clarity.ms/0.8.59/clarity.jsscripts.clarity.ms/0.8.59/clarity.j... https://scripts.clarity.ms/0.8.59/clarity.js — 200 — 26.1 KiB — 156 ms — h2https://www.bt.cn/static/astro/images/trust/fuli.pngwww.bt.cn/static/astro/images/trust... https://www.bt.cn/static/astro/images/trust/fuli.png — 200 — 33.2 KiB — 769 ms — h2https://www.bt.cn/static/astro/images/trust/hunan.pngwww.bt.cn/static/astro/images/trust... https://www.bt.cn/static/astro/images/trust/hunan.png — 200 — 30.5 KiB — 770 ms — h2https://www.bt.cn/static/astro/woff2/fa-solid-900.woff2www.bt.cn/static/astro/woff2/fa-sol... https://www.bt.cn/static/astro/woff2/fa-solid-900.woff2 — 200 — 111.0 KiB — 569 ms — h2https://www.bt.cn/static/astro/js/Layout.astro_astro_type_script_index_0_lang.js?version=1776821593www.bt.cn/static/astro/js/Layout.as... https://www.bt.cn/static/astro/js/Layout.astro_astro_type_script_index_0_lang.js?version=1776821593 — 200 — 5.5 KiB — 765 ms — h2https://www.bt.cn/static/astro/js/utils-vendor.js?version=1776821593www.bt.cn/static/astro/js/utils-ven... https://www.bt.cn/static/astro/js/utils-vendor.js?version=1776821593 — 200 — 60.7 KiB — 769 ms — h2https://www.bt.cn/static/astro/js/vue-vendor.js?version=1776821593www.bt.cn/static/astro/js/vue-vendo... https://www.bt.cn/static/astro/js/vue-vendor.js?version=1776821593 — 200 — 39.0 KiB — 770 ms — h2https://www.bt.cn/static/astro/js/__commonjsHelpers__.js?version=1776821593www.bt.cn/static/astro/js/__commonj... https://www.bt.cn/static/astro/js/__commonjsHelpers__.js?version=1776821593 — 200 — 457 B — 767 ms — h2https://www.bt.cn/static/astro/js/CustomerServiceTooltip.astro_astro_type_script_index_0_lang.js?version=1776821593www.bt.cn/static/astro/js/CustomerS... https://www.bt.cn/static/astro/js/CustomerServiceTooltip.astro_astro_type_script_index_0_lang.js?version=1776821593 — 200 — 957 B — 766 ms — h2https://aqyzmedia.yunaq.com/labels/label_sm_90020.pngaqyzmedia.yunaq.com/labels/label_sm... https://aqyzmedia.yunaq.com/labels/label_sm_90020.png — 200 — 8.5 KiB — 1.2 s — http/1.1
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 FCP 4.1 s LCP 7.9 shttps://bt.cn// https://bt.cn/ — 302 — 107 B — 747 ms — h2https://www.bt.cn/www.bt.cn/ https://www.bt.cn/ — 302 — 321 B — 705 ms — h2https://www.bt.cn/new/index.htmlwww.bt.cn/new/index.html https://www.bt.cn/new/index.html — 200 — 20.3 KiB — 509 ms — h2https://bat.bing.com/bat.js?version=1776821593bat.bing.com/bat.js?version=1776821... https://bat.bing.com/bat.js?version=1776821593 — 200 — 15.5 KiB — 115 ms — h2https://hm.baidu.com/hm.js?6e78ef648057d9f2ab12dcc287b440f6hm.baidu.com/hm.js?6e78ef648057d9f2... https://hm.baidu.com/hm.js?6e78ef648057d9f2ab12dcc287b440f6 — 200 — 19.6 KiB — 1.4 s — http/1.1https://www.bt.cn/static/astro/css/index.css?version=1776821593www.bt.cn/static/astro/css/index.cs... https://www.bt.cn/static/astro/css/index.css?version=1776821593 — 200 — 3.2 KiB — 218 ms — h2https://www.bt.cn/static/astro/css/1111-1.css?version=1776821593www.bt.cn/static/astro/css/1111-1.c... https://www.bt.cn/static/astro/css/1111-1.css?version=1776821593 — 200 — 53.6 KiB — 435 ms — h2https://www.bt.cn/static/astro/icon/logo.svgwww.bt.cn/static/astro/icon/logo.sv... https://www.bt.cn/static/astro/icon/logo.svg — 200 — 47.2 KiB — 646 ms — h2https://www.bt.cn/static/astro/js/Header.astro_astro_type_script_index_0_lang.js?version=1776821593www.bt.cn/static/astro/js/Header.as... https://www.bt.cn/static/astro/js/Header.astro_astro_type_script_index_0_lang.js?version=1776821593 — 200 — 558 B — 435 ms — h2https://www.bt.cn/static/astro/images/home/free-icon.pngwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/free-icon.png — 200 — 3.2 KiB — 438 ms — h2https://www.bt.cn/static/astro/images/home/banner-1/banner-bg-1.pngwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/banner-1/banner-bg-1.png — 200 — 274.3 KiB — 1.1 s — h2https://www.bt.cn/static/astro/images/home/banner-1/bt_video.gifwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/banner-1/bt_video.gif — 200 — 2.7 MiB — 3.1 s — h2https://www.bt.cn/static/astro/images/decoration/panel-pc.pngwww.bt.cn/static/astro/images/decor... https://www.bt.cn/static/astro/images/decoration/panel-pc.png — 200 — 12.5 KiB — 858 ms — h2https://www.bt.cn/static/astro/images/home/banner-1/banner-bg-2.pngwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/banner-1/banner-bg-2.png — 200 — 228.5 KiB — 1.3 s — h2https://www.bt.cn/static/astro/images/home/banner-1/banner-domain-overview.pngwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/banner-1/banner-domain-overview.png — 200 — 167.7 KiB — 1.3 s — h2https://www.bt.cn/static/astro/images/home/banner-1/banner-bg-3.pngwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/banner-1/banner-bg-3.png — 200 — 314.7 KiB — 3.0 s — h2https://www.bt.cn/static/astro/images/home/banner-1/banner-ssl-overview.pngwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/banner-1/banner-ssl-overview.png — 200 — 97.3 KiB — 2.8 s — h2https://www.bt.cn/static/astro/js/StoryCarousel.astro_astro_type_script_index_0_lang.js?version=1776821593www.bt.cn/static/astro/js/StoryCaro... https://www.bt.cn/static/astro/js/StoryCarousel.astro_astro_type_script_index_0_lang.js?version=1776821593 — 200 — 3.2 KiB — 434 ms — h2https://bat.bing.com/p/action/97128650.jsbat.bing.com/p/action/97128650.js https://bat.bing.com/p/action/97128650.js — 200 — 1.8 KiB — 36 ms — h2https://www.clarity.ms/tag/uet/97128650?insights=1www.clarity.ms/tag/uet/97128650?ins... https://www.clarity.ms/tag/uet/97128650?insights=1 — 200 — 1.0 KiB — 163 ms — http/1.1https://scripts.clarity.ms/0.8.59/clarity.jsscripts.clarity.ms/0.8.59/clarity.j... https://scripts.clarity.ms/0.8.59/clarity.js — 200 — 26.1 KiB — 156 ms — 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http/1.1https://www.bt.cn/static/astro/images/openclaw/openclaw-color.svgwww.bt.cn/static/astro/images/openc... https://www.bt.cn/static/astro/images/openclaw/openclaw-color.svg — 200 — 2.4 KiB — 768 ms — h2https://www.bt.cn/static/astro/js/NotificationSlide.astro_astro_type_script_index_0_lang.js?version=1776821593www.bt.cn/static/astro/js/Notificat... https://www.bt.cn/static/astro/js/NotificationSlide.astro_astro_type_script_index_0_lang.js?version=1776821593 — 200 — 558 B — 762 ms — h2https://www.bt.cn/static/astro/js/index.astro_astro_type_script_index_0_lang.js?version=1776821593www.bt.cn/static/astro/js/index.ast... https://www.bt.cn/static/astro/js/index.astro_astro_type_script_index_0_lang.js?version=1776821593 — 200 — 2.5 KiB — 762 ms — h2https://www.bt.cn/static/astro/images/home/overview-tabs/tabs-active.pngwww.bt.cn/static/astro/images/home/... https://www.bt.cn/static/astro/images/home/overview-tabs/tabs-active.png — 200 — 36.2 KiB — 762 ms — 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https://www.bt.cn/favicon.ico — 200 — 4.5 KiB — 261 ms — h2https://n.clarity.ms/collectn.clarity.ms/collect https://n.clarity.ms/collect — 204 — 273 B — 100 ms — 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 3801ms · 87KB · ¥188/mo
www.bt.cn
Other
Costly
Execution 2990ms
Transfer 20 KB
Monthly Cost ¥148/mo
Unattributable
Other
Costly
Execution 346ms
Transfer 0 KB
Monthly Cost ¥17/mo
Microsoft Clarity
Session Replay
Costly
Execution 284ms
Transfer 26 KB
Monthly Cost ¥14/mo
hm.baidu.com
Other
Optional
Execution 64ms
Transfer 20 KB
Monthly Cost ¥3/mo
Bing UET
Advertising
Optional
Execution 59ms
Transfer 15 KB
Monthly Cost ¥3/mo
www.bt.cn
Other
Optional
Execution 58ms
Transfer 6 KB
Monthly Cost ¥3/mo

These scripts may cost more than they're worth

  • www.bt.cn adds 2990ms and costs ~¥148/month
  • Unattributable adds 346ms and costs ~¥17/month
  • Microsoft Clarity adds 284ms 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

www.bt.cn takes 2990ms 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 346ms 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

Microsoft Clarity takes 284ms 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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