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https://beijing.gov.cn

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
2
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
61
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
70
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

2.92 s

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

5.85 s

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

72 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.

6.95 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.

11.20 s

Page Load Progression

1.1 s
2.1 s
3.2 s
4.2 s
5.3 s
6.3 s
7.4 s
8.4 s
Checks
15
7 PASS 4 REVIEW 2 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 143 requests
FIX
3.0 MB transferred, 143 requests
Warning::
Page weighs 3.6 MB (3.0 MB transferred)
Warning::
Images are 2.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.5 MB
Warning::
143 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.64 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
143 requests
0.64 g CO2 per page load
Images 2.5 MiB 83%
JavaScript 286.3 KiB 9%
Fonts 169.6 KiB 5%
HTML 43.4 KiB 1%
Other 8.3 KiB 0%
CSS 6.4 KiB 0%
Other 1.6 KiB 0%
Other 0 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

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
JS Execution Cost
Action
2291ms total JS execution
FIX
2291ms total JS execution
Warning::
https://www.beijing.gov.cn/: 894ms CPU time
Warning::
Unattributable: 745ms CPU time
Info::
https://wza.beijing.gov.cn/dist/aria.js?appid=3648...: 186ms CPU time
Info::
https://www.beijing.gov.cn/images/jquery.js: 173ms CPU time
Info::
https://www.beijing.gov.cn/images/public_foot_resp...: 161ms CPU time
Info::
Third-party scripts: 1012ms (44% of total)

Main Thread Breakdown

Other 42% Style & Layout 24% Script Evaluation 20% Rendering 8% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.beijing.gov.cn/894ms55ms8ms1st
Unattributable745ms8ms0ms3rd
https://wza.beijing.gov.cn/dist/aria.js?appid=364831ca4967b33c2dc7bae52178a683186ms137ms33ms3rd
https://www.beijing.gov.cn/images/jquery.js173ms127ms24ms1st
https://www.beijing.gov.cn/images/public_foot_response_2020.js161ms21ms4ms1st
https://yhxw.tj.beijing.gov.cn/vas.js80ms59ms4ms3rd
https://www.beijing.gov.cn/images/swiper.min.js51ms11ms6ms1st
C
Image Optimization
Action
107 images, 0 KB saveable
REVIEW
107 images, 0 KB saveable
Warning::
https://www.beijing.gov.cn/shouye/sylbt/202602/W02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/toutiao/202604/W... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202004/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/images/index_icon_zzc_2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/sylbt/202510/W02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/sylbt/202603/W02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/sylbt/202409/W02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202507/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/images/index_icon_bs_20... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/sylbt/202603/W02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202604/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202501/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/sylbt/202402/W02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202602/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/images/index_imgsld_mob... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202602/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/images/logo_ch_20191009... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202004/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202004/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/images/index_icon_xwfbh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/images/ico_dzjg_ch_2019... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202004/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/sylbt/202603/W02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202204/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202209/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/images/common_gotop_202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/images/common_more_2025... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/sylbt/202312/W02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202012/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/sylbt/202603/W02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/images/index_icon_znwd_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/images/index_icon_zhd_2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/sylbt/202603/W02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202603/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/sylbt/202603/W02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202602/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.beijing.gov.cn/shouye/syfwtj/202004/W0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
107 images 2.5 MB
0 oversized -0 KB
107 legacy format
37 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

B
JS Bundles
17 scripts, 117 KB unused
REVIEW
17 scripts, 117 KB unused
Warning::
https://wza.beijing.gov.cn/dist/aria.js?appid=3648...: 95 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.beijing.gov.cn/images/jquery.js: 21 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 117 KB
117 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://wza.beijing.gov.cn/dist/aria.js?appid=364831ca4967b33c2dc7bae52178a683137 KB95 KB (70%)✓3rd
https://www.beijing.gov.cn/images/jquery.js32 KB21 KB (69%)✓1st
https://www.beijing.gov.cn/images/public_foot_response_2020.js9 KB—✓1st
https://www.beijing.gov.cn/images/swiper.min.js25 KB—✓1st
https://www.beijing.gov.cn/images/menu_ziyuanku.js2 KB—✓1st
https://www.beijing.gov.cn/hudong/yonghu/js/front/hdSyn.min.js3 KB—✓1st
https://www.beijing.gov.cn/images/speech/speech.umd.js3 KB—✓1st
https://www.beijing.gov.cn/images/speech/speech.js3 KB—✓1st
https://www.beijing.gov.cn/images/zhengwu_header_ziyuanku_2025.js9 KB—✓1st
https://www.beijing.gov.cn/images/ks-jquery.SuperSlide.2.1.1.js4 KB—✓1st

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
Page Weight Inventory
Action
143 resources · 3.0 MB · 117 KB savings available
REVIEW
143 resources · 3.0 MB · 117 KB savings available
Warning::
Page weight 2.0 MB over 1MB target
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~117 KB of savings available
Info::
15 third-party resources (6% of weight)
Info::
1 resources over 200KB
143 resources · 3.0 MiB · 15 third-party 2.0 MiB over 1MB target
Image 83% · 2.5 MiB
JavaScript 9% · 286.3 KiB
Font 5% · 169.6 KiB
Document 2% · 47.2 KiB
CSS 0% · 6.4 KiB
Other 0% · 4.6 KiB

~116.6 KiB of savings available

Remove unused JavaScript: 116.6 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
6% third-party, 0 ms blocking
PASS
6% third-party, 0 ms blocking
Info::
Third-party code accounts for 6% of page weight (186.7 KiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
94%
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
2 fonts (170 KB)
PASS
2 fonts (170 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

170 KB total

Render-blocking

0

of 2

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 FCP 2.9 s LCP 5.8 shttps://www.beijing.gov.cn/images/hanyu-20201106.ttfhanyu-20201106.ttf https://www.beijing.gov.cn/images/hanyu-20201106.ttf — 2.7 KiB — 287 ms — font-display: swaphttps://www.beijing.gov.cn/images/alaboyu-20201102.ttfalaboyu-20201102.ttf https://www.beijing.gov.cn/images/alaboyu-20201102.ttf — 166.9 KiB — 935 ms — font-display: swap
hanyu-20201106.ttf ttf swap
Size 3 KB
Load time 287 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
alaboyu-20201102.ttf ttf swap
Size 167 KB
Load time 935 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • 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 ~134 KB and ~268 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
HTTP Caching
max-age=60 (1 minute)
PASS
max-age=60 (1 minute)
Info::
Cache-Control header is set
Got: max-age=60
Info::
Effective TTL: 1 minute (max-age=60)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=60

DirectiveValueMeaning
max-age60Cache for 1 minute
Effective TTL: 60 seconds
Network Waterfall
143 requests over 8127ms
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 2.9 s LCP 5.8 shttps://www.beijing.gov.cn// https://www.beijing.gov.cn/ — 200 — 43.4 KiB — 958 ms — http/1.1https://www.beijing.gov.cn/images/swiper.min.css/images/swiper.min.css https://www.beijing.gov.cn/images/swiper.min.css — 200 — 3.6 KiB — 253 ms — http/1.1https://www.beijing.gov.cn/images/zhengwu_header_ziyuanku_2025.js/images/zhengwu_header_ziyuanku_202... https://www.beijing.gov.cn/images/zhengwu_header_ziyuanku_2025.js — 200 — 9.4 KiB — 473 ms — http/1.1https://www.beijing.gov.cn/images/jquery.js/images/jquery.js https://www.beijing.gov.cn/images/jquery.js — 200 — 31.5 KiB — 779 ms — http/1.1https://www.beijing.gov.cn/images/jquery-migrate.min.js/images/jquery-migrate.min.js https://www.beijing.gov.cn/images/jquery-migrate.min.js — 200 — 5.5 KiB — 640 ms — http/1.1https://www.beijing.gov.cn/images/ks-jquery.SuperSlide.2.1.1.js/images/ks-jquery.SuperSlide.2.1.1.... https://www.beijing.gov.cn/images/ks-jquery.SuperSlide.2.1.1.js — 200 — 3.9 KiB — 643 ms — http/1.1https://www.beijing.gov.cn/images/sdzc_logo_ch_20190909.png/images/sdzc_logo_ch_20190909.png https://www.beijing.gov.cn/images/sdzc_logo_ch_20190909.png — 200 — 3.4 KiB — 653 ms — http/1.1https://www.beijing.gov.cn/images/index_logo_20230610.png/images/index_logo_20230610.png https://www.beijing.gov.cn/images/index_logo_20230610.png — 200 — 29.7 KiB — 753 ms — http/1.1https://www.beijing.gov.cn/images/index_banshi_icon01_20230610.png/images/index_banshi_icon01_2023061... https://www.beijing.gov.cn/images/index_banshi_icon01_20230610.png — 200 — 973 B — 229 ms — http/1.1https://www.beijing.gov.cn/images/menu_ziyuanku.js/images/menu_ziyuanku.js https://www.beijing.gov.cn/images/menu_ziyuanku.js — 200 — 2.3 KiB — 407 ms — http/1.1https://www.beijing.gov.cn/hudong/yonghu/js/front/hdSyn.min.js/hudong/yonghu/js/front/hdSyn.min.j... https://www.beijing.gov.cn/hudong/yonghu/js/front/hdSyn.min.js 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http/1.1https://www.beijing.gov.cn/images/zwxmtfbt_qrcode_20251201.png/images/zwxmtfbt_qrcode_20251201.pn... https://www.beijing.gov.cn/images/zwxmtfbt_qrcode_20251201.png — 200 — 9.6 KiB — 232 ms — http/1.1https://wza.beijing.gov.cn/api/services/Accessibility/Configuration/checkHasOldFixed?appid=364831ca4967b33c2dc7bae52178a683&timestamp=1776817101408&domain=www.beijing.gov.cn&referer=https%3A%2F%2Fwww.beijing.gov.cn%2F&mainversion=4wza.beijing.gov.cn/api/services/Acc... https://wza.beijing.gov.cn/api/services/Accessibility/Configuration/checkHasOldFixed?appid=364831ca4967b33c2dc7bae52178a683&timestamp=1776817101408&domain=www.beijing.gov.cn&referer=https%3A%2F%2Fwww.beijing.gov.cn%2F&mainversion=4 — 204 — 0 B — 301 ms — http/1.1https://yhxw.tj.beijing.gov.cn/logcount.html?website=10005012&server=s1&datatype=simnet_simnet&sendid=1776817101494yhxw.tj.beijing.gov.cn/logcount.htm... https://yhxw.tj.beijing.gov.cn/logcount.html?website=10005012&server=s1&datatype=simnet_simnet&sendid=1776817101494 — 200 — 954 B — 273 ms — http/1.1https://www.beijing.gov.cn/favicon.ico/favicon.ico https://www.beijing.gov.cn/favicon.ico — 200 — 1.6 KiB — 225 ms — http/1.1https://wza.beijing.gov.cn/api/services/Accessibility/Configuration/checkHasOldFixed?appid=364831ca4967b33c2dc7bae52178a683&timestamp=1776817101408&domain=www.beijing.gov.cn&referer=https%3A%2F%2Fwww.beijing.gov.cn%2F&mainversion=4wza.beijing.gov.cn/api/services/Acc... https://wza.beijing.gov.cn/api/services/Accessibility/Configuration/checkHasOldFixed?appid=364831ca4967b33c2dc7bae52178a683&timestamp=1776817101408&domain=www.beijing.gov.cn&referer=https%3A%2F%2Fwww.beijing.gov.cn%2F&mainversion=4 — 200 — 640 B — 266 ms — http/1.1https://wza.beijing.gov.cn/api/services/Accessibility/Configuration/checkLoadData?appid=364831ca4967b33c2dc7bae52178a683&timestamp=1776817101999&domain=www.beijing.gov.cn&referer=https%3A%2F%2Fwww.beijing.gov.cn%2F&mainversion=4wza.beijing.gov.cn/api/services/Acc... https://wza.beijing.gov.cn/api/services/Accessibility/Configuration/checkLoadData?appid=364831ca4967b33c2dc7bae52178a683&timestamp=1776817101999&domain=www.beijing.gov.cn&referer=https%3A%2F%2Fwww.beijing.gov.cn%2F&mainversion=4 — 204 — 0 B — 275 ms — http/1.1https://wza.beijing.gov.cn/api/services/Accessibility/Configuration/checkLoadData?appid=364831ca4967b33c2dc7bae52178a683&timestamp=1776817101999&domain=www.beijing.gov.cn&referer=https%3A%2F%2Fwww.beijing.gov.cn%2F&mainversion=4wza.beijing.gov.cn/api/services/Acc... https://wza.beijing.gov.cn/api/services/Accessibility/Configuration/checkLoadData?appid=364831ca4967b33c2dc7bae52178a683&timestamp=1776817101999&domain=www.beijing.gov.cn&referer=https%3A%2F%2Fwww.beijing.gov.cn%2F&mainversion=4 — 200 — 724 B — 301 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
44% of JavaScript execution is third-party
First-party Third-party 1012ms · 151KB · ¥50/mo
Unattributable
Other
Costly
Execution 745ms
Transfer 0 KB
Monthly Cost ¥37/mo
wza.beijing.gov.cn
Other
Optional
Execution 186ms
Transfer 137 KB
Unused 70%
Monthly Cost ¥9/mo
yhxw.tj.beijing.gov.cn
Other
Optional
Execution 80ms
Transfer 14 KB
Monthly Cost ¥4/mo

These scripts may cost more than they're worth

  • Unattributable adds 745ms and costs ~¥37/month

44% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 745ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

70% of wza.beijing.gov.cn's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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