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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
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.
45
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
69
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.

2.30 s

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

5.67 s

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

14 ms

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

0.224

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

4.09 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.

5.71 s

Page Load Progression

893 ms
1.8 s
2.7 s
3.6 s
4.5 s
5.4 s
6.3 s
7.1 s
Checks
15
5 PASS 4 REVIEW 4 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 145 requests
FIX
2.4 MB transferred, 145 requests
Info::
Page weighs 3.4 MB (2.4 MB transferred)
Warning::
Images are 2.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.0 MB
Warning::
145 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.50 g CO2 per page load
2.4 MB / 2.4 MB budget
2.4 MB transferred
145 requests
0.50 g CO2 per page load
Images 2.0 MiB 84%
JavaScript 339.2 KiB 14%
HTML 40.2 KiB 2%
CSS 19.1 KiB 1%
Other 1.8 KiB 0%
Other 761 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

Why this matters

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

Source: web.dev

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 (2.4 MiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
145 resources · 2.4 MB · 81 KB savings available
FIX
145 resources · 2.4 MB · 81 KB savings available
Warning::
Page weight 1.4 MB over 1MB target
Got: 2.4 MB Expected: ≤ 1 MB
Info::
~81 KB of savings available
Warning::
144 third-party resources (100% of weight)
Info::
2 resources over 200KB
145 resources · 2.4 MiB · 144 third-party 1.4 MiB over 1MB target
Image 84% · 2.0 MiB
JavaScript 14% · 339.2 KiB
Document 2% · 42.2 KiB
CSS 1% · 19.1 KiB
Other 0% · 0 B

~81.4 KiB of savings available

Remove unused JavaScript: 81.4 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
101 images, 0 KB saveable
REVIEW
101 images, 0 KB saveable
Warning::
https://platform-permanent.ddimg.cn/pt-front-cms-u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://platform-permanent.ddimg.cn/pt-front-cms-u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://platform-permanent.ddimg.cn/pt-front-cms-u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://platform-permanent.ddimg.cn/pt-front-cms-u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://backend-permanent.ddimg.cn/adsmart/2026/4/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img61.ddimg.cn/7d593c48-48f6-4fc9-85e0-7d6... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img61.ddimg.cn/ddimg/1462/acc2_icon_06-164... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img63.ddimg.cn/upload_img/00111/home/brand... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img60.ddimg.cn/upload_img/00459/home/cnnic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://platform-permanent.ddimg.cn/pt-front-cms-u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img60.ddimg.cn/assets/pc_image/jinggongwan... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
101 images 2.0 MB
0 oversized -0 KB
100 legacy format
11 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

B
JS Execution Cost
707ms total JS execution
REVIEW
707ms total JS execution
Info::
Unattributable: 237ms CPU time
Info::
https://www.dangdang.com/: 181ms CPU time
Info::
https://databack.dangdang.com/store.js?20260423: 132ms CPU time
Info::
https://www.dangdang.com/static/script/jquery-1.11...: 83ms CPU time
Info::
https://static.dangdang.com/cim/imp/static/js/main...: 75ms CPU time
Warning::
Third-party scripts: 707ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Other 37% Style & Layout 10% Script Parsing & Compilation 8% Parse HTML & CSS 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable237ms2ms0ms3rd
https://www.dangdang.com/181ms10ms3ms3rd
https://databack.dangdang.com/store.js?20260423132ms108ms0ms3rd
https://www.dangdang.com/static/script/jquery-1.11.3.min.js83ms60ms7ms3rd
https://static.dangdang.com/cim/imp/static/js/main.173af672.chunk.js75ms67ms3ms3rd
B
JS Bundles
23 scripts, 81 KB unused
REVIEW
23 scripts, 81 KB unused
Warning::
https://www.dangdang.com/Standard/Framework/Extend...: 49 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.dangdang.com/cim/imp/static/js/2.bc...: 33 KB unused (30%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 81 KB
81 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.dangdang.com/Standard/Framework/Extend/hosts/js/??jquery/lazyloadDiv0615.min.js?202604230510,smart.min.js?202604230510,mix.min.js?202604230510,LoginWindow.min.js?202604230510,collect.min.js?202604230510,store.min.js?202604230510,adall.min.js?202604230510,js_tracker.min.js?20260423051087 KB49 KB (56%)✓3rd
https://static.dangdang.com/cim/imp/static/js/2.bc996403.chunk.js108 KB33 KB (30%)✓3rd
https://databack.dangdang.com/store.js?202604232 KB—✓3rd
https://www.dangdang.com/Standard/Framework/Extend/hosts/js/??pagetop.min.js?20260423,categorydata_new.min.js?20260423,dd.menu-aim.min.js?2026042339 KB—✓3rd
https://static.ddimg.cn/js/login/LoginWindow.js?2017061912 KB—✓3rd
https://www.dangdang.com/Standard/Framework/Extend/hosts/js/pc_mina.js?2026042305100 KB—✓3rd
https://www.dangdang.com/Standard/Framework/Extend/hosts/js/pcHomeAccessbility.js?2026042305104 KB—✓3rd
https://static.dangdang.com/js/login/check_snbrowse.js?202604231 KB—✓3rd
https://click.dangdang.com/js_tracker.js?202604238 KB—✓3rd
https://databack.dangdang.com/collect.js?2026042312 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
145 requests over 6439ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.3 s LCP 5.7 shttps://dangdang.com// https://dangdang.com/ — 301 — 242 B — 813 ms — http/1.1http://www.dangdang.com/www.dangdang.com/ http://www.dangdang.com/ — 307 — 0 B — 3 ms — http/1.1https://www.dangdang.com/www.dangdang.com/ https://www.dangdang.com/ — 200 — 35.6 KiB — 903 ms — h2https://www.dangdang.com/Standard/Framework/Extend/hosts/css/model/homemin.css?20221202www.dangdang.com/Standard/Framework... https://www.dangdang.com/Standard/Framework/Extend/hosts/css/model/homemin.css?20221202 — 200 — 1.9 KiB — 575 ms — h2https://static.dangdang.com/js/header2012/pagetop_accessbility.min.js?v=20230626static.dangdang.com/js/header2012/p... https://static.dangdang.com/js/header2012/pagetop_accessbility.min.js?v=20230626 — 200 — 2.4 KiB — 1.0 s — h2https://img3.ddimg.cn/00363/doc/erweima2.pngimg3.ddimg.cn/00363/doc/erweima2.pn... https://img3.ddimg.cn/00363/doc/erweima2.png — 200 — 1.3 KiB — 1.7 s — http/1.1https://platform-permanent.ddimg.cn/pt-front-cms-upload-file/2025/12/19/2025121912002032910.pngplatform-permanent.ddimg.cn/pt-fron... https://platform-permanent.ddimg.cn/pt-front-cms-upload-file/2025/12/19/2025121912002032910.png — 200 — 1.6 KiB — 903 ms — http/1.1https://platform-permanent.ddimg.cn/pt-front-cms-upload-file/2025/12/18/2025121814464873534.pngplatform-permanent.ddimg.cn/pt-fron... https://platform-permanent.ddimg.cn/pt-front-cms-upload-file/2025/12/18/2025121814464873534.png — 200 — 7.4 KiB — 911 ms — http/1.1https://www.dangdang.com/Standard/Framework/Extend/hosts/js/??pagetop.min.js?20260423,categorydata_new.min.js?20260423,dd.menu-aim.min.js?20260423www.dangdang.com/Standard/Framework... https://www.dangdang.com/Standard/Framework/Extend/hosts/js/??pagetop.min.js?20260423,categorydata_new.min.js?20260423,dd.menu-aim.min.js?20260423 — 200 — 38.8 KiB — 785 ms — h2https://platform-permanent.ddimg.cn/pt-front-cms-upload-file/2025/12/29/2025122913031122847.jpgplatform-permanent.ddimg.cn/pt-fron... https://platform-permanent.ddimg.cn/pt-front-cms-upload-file/2025/12/29/2025122913031122847.jpg — 200 — 60.7 KiB — 954 ms — http/1.1https://img63.ddimg.cn/2024/5/22/2024052209403755540.jpgimg63.ddimg.cn/2024/5/22/2024052209... https://img63.ddimg.cn/2024/5/22/2024052209403755540.jpg — 200 — 21.2 KiB — 977 ms — http/1.1https://img63.ddimg.cn/2024/5/22/2024052209403756123.jpgimg63.ddimg.cn/2024/5/22/2024052209... https://img63.ddimg.cn/2024/5/22/2024052209403756123.jpg — 200 — 18.9 KiB — 1.3 s — http/1.1https://platform-permanent.ddimg.cn/pt-front-cms-upload-file/2026/2/12/202602121436102815.jpgplatform-permanent.ddimg.cn/pt-fron... https://platform-permanent.ddimg.cn/pt-front-cms-upload-file/2026/2/12/202602121436102815.jpg — 200 — 39.1 KiB — 1.1 s — http/1.1https://img60.ddimg.cn/upload_img/00111/home/loading.gifimg60.ddimg.cn/upload_img/00111/hom... https://img60.ddimg.cn/upload_img/00111/home/loading.gif — 200 — 4.1 KiB — 1.2 s — http/1.1https://static.ddimg.cn/js/login/LoginWindow.js?20170619static.ddimg.cn/js/login/LoginWindo... https://static.ddimg.cn/js/login/LoginWindow.js?20170619 — 200 — 12.4 KiB — 1.0 s — http/1.1https://www.dangdang.com/static/script/jquery-1.11.3.min.jswww.dangdang.com/static/script/jque... https://www.dangdang.com/static/script/jquery-1.11.3.min.js — 200 — 34.2 KiB — 481 ms — h2https://www.dangdang.com/Standard/Framework/Extend/hosts/js/??jquery/lazyloadDiv0615.min.js?202604230510,smart.min.js?202604230510,mix.min.js?202604230510,LoginWindow.min.js?202604230510,collect.min.js?202604230510,store.min.js?202604230510,adall.min.js?202604230510,js_tracker.min.js?202604230510www.dangdang.com/Standard/Framework... https://www.dangdang.com/Standard/Framework/Extend/hosts/js/??jquery/lazyloadDiv0615.min.js?202604230510,smart.min.js?202604230510,mix.min.js?202604230510,LoginWindow.min.js?202604230510,collect.min.js?202604230510,store.min.js?202604230510,adall.min.js?202604230510,js_tracker.min.js?202604230510 — 200 — 87.3 KiB — 823 ms — h2https://www.dangdang.com/Standard/Framework/Extend/hosts/js/pc_mina.js?202604230510www.dangdang.com/Standard/Framework... https://www.dangdang.com/Standard/Framework/Extend/hosts/js/pc_mina.js?202604230510 — 200 — 505 B — 510 ms — h2https://www.dangdang.com/Standard/Framework/Extend/hosts/js/pcHomeAccessbility.js?202604230510www.dangdang.com/Standard/Framework... https://www.dangdang.com/Standard/Framework/Extend/hosts/js/pcHomeAccessbility.js?202604230510 — 200 — 3.6 KiB — 812 ms — h2https://platform-permanent.ddimg.cn/pt-front-cms-upload-file/2026/1/14/202601141054102039.pngplatform-permanent.ddimg.cn/pt-fron... https://platform-permanent.ddimg.cn/pt-front-cms-upload-file/2026/1/14/202601141054102039.png — 200 — 1.8 KiB — 316 ms — http/1.1https://static.dangdang.com/css/header2012/footer_150526.css?20170626static.dangdang.com/css/header2012/... https://static.dangdang.com/css/header2012/footer_150526.css?20170626 — 200 — 1.4 KiB — 454 ms — h2https://img63.ddimg.cn/upload_img/00459/home/head_sprite.pngimg63.ddimg.cn/upload_img/00459/hom... https://img63.ddimg.cn/upload_img/00459/home/head_sprite.png — 200 — 4.5 KiB — 391 ms — http/1.1https://img62.ddimg.cn/upload_img/00459/home/icon_cart.pngimg62.ddimg.cn/upload_img/00459/hom... https://img62.ddimg.cn/upload_img/00459/home/icon_cart.png — 200 — 2.7 KiB — 1.0 s — http/1.1https://static.dangdang.com/js/login/check_snbrowse.js?20260423static.dangdang.com/js/login/check_... https://static.dangdang.com/js/login/check_snbrowse.js?20260423 — 200 — 879 B — 452 ms — h2https://img60.ddimg.cn/upload_img/00111/home/home_sprite_1507.pngimg60.ddimg.cn/upload_img/00111/hom... https://img60.ddimg.cn/upload_img/00111/home/home_sprite_1507.png — 200 — 3.5 KiB — 707 ms — http/1.1https://img63.ddimg.cn/upload_img/00446/111/bg_sidebar.pngimg63.ddimg.cn/upload_img/00446/111... https://img63.ddimg.cn/upload_img/00446/111/bg_sidebar.png — 200 — 1.7 KiB — 358 ms — http/1.1https://img63.ddimg.cn/2019/8/30/2019083014415426253.pngimg63.ddimg.cn/2019/8/30/2019083014... https://img63.ddimg.cn/2019/8/30/2019083014415426253.png — 200 — 4.8 KiB — 413 ms — http/1.1https://click.dangdang.com/js_tracker.js?20260423click.dangdang.com/js_tracker.js?20... https://click.dangdang.com/js_tracker.js?20260423 — 200 — 8.3 KiB — 919 ms — http/1.1https://databack.dangdang.com/collect.js?20260423databack.dangdang.com/collect.js?20... https://databack.dangdang.com/collect.js?20260423 — 200 — 12.2 KiB — 932 ms — http/1.1https://databack.dangdang.com/store.js?20260423databack.dangdang.com/store.js?2026... https://databack.dangdang.com/store.js?20260423 — 200 — 2.3 KiB — 897 ms — http/1.1
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.3 s LCP 5.7 shttps://dangdang.com// https://dangdang.com/ — 301 — 242 B — 813 ms — http/1.1http://www.dangdang.com/www.dangdang.com/ http://www.dangdang.com/ — 307 — 0 B — 3 ms — http/1.1https://www.dangdang.com/www.dangdang.com/ https://www.dangdang.com/ — 200 — 35.6 KiB — 903 ms — h2https://www.dangdang.com/Standard/Framework/Extend/hosts/css/model/homemin.css?20221202www.dangdang.com/Standard/Framework... https://www.dangdang.com/Standard/Framework/Extend/hosts/css/model/homemin.css?20221202 — 200 — 1.9 KiB — 575 ms — h2https://static.dangdang.com/js/header2012/pagetop_accessbility.min.js?v=20230626static.dangdang.com/js/header2012/p... https://static.dangdang.com/js/header2012/pagetop_accessbility.min.js?v=20230626 — 200 — 2.4 KiB — 1.0 s — h2https://img3.ddimg.cn/00363/doc/erweima2.pngimg3.ddimg.cn/00363/doc/erweima2.pn... https://img3.ddimg.cn/00363/doc/erweima2.png — 200 — 1.3 KiB — 1.7 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
100% of JavaScript execution is third-party
First-party Third-party 707ms · 92KB · ¥29/mo
Unattributable
Other
Costly
Execution 237ms
Transfer 0 KB
Monthly Cost ¥10/mo
www.dangdang.com
Other
Optional
Execution 181ms
Transfer 36 KB
Monthly Cost ¥7/mo
databack.dangdang.com
Other
Optional
Execution 132ms
Transfer 2 KB
Monthly Cost ¥5/mo
www.dangdang.com
Other
Optional
Execution 83ms
Transfer 34 KB
Monthly Cost ¥3/mo
static.dangdang.com
Other
Optional
Execution 75ms
Transfer 20 KB
Monthly Cost ¥3/mo

These scripts may cost more than they're worth

  • Unattributable adds 237ms and costs ~¥10/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.

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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 237ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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

Source: web.dev

How third-party costs are calculated

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

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