Tools & Wizards About Us
csdn.net screenshot

Report Summary

  • 31

    Performance

    Renders faster than
    51% of other websites

  • 68

    Accessibility

    Visual factors better than
    that of 33% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 82

    SEO

    Google-friendlier than
    44% of websites

csdn.net

CSDN - 专业开发者社区

Page Load Speed

8.6 sec in total

First Response

467 ms

Resources Loaded

7.3 sec

Page Rendered

895 ms

csdn.net screenshot

About Website

Click here to check amazing CSDN content for China. Otherwise, check out these important facts you probably never knew about csdn.net

CSDN是全球知名中文IT技术交流平台,创建于1999年,包含原创博客、精品问答、职业培训、技术论坛、资源下载等产品服务,提供原创、优质、完整内容的专业IT技术开发社区.

Visit csdn.net

Key Findings

We analyzed Csdn.net page load time and found that the first response time was 467 ms and then it took 8.2 sec to load all DOM resources and completely render a web page. This is a poor result, as 85% of websites can load faster.

Performance Metrics

csdn.net performance score

31

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.7 s

5/100

10%

LCP (Largest Contentful Paint)

Value5.7 s

16/100

25%

SI (Speed Index)

Value9.7 s

11/100

10%

TBT (Total Blocking Time)

Value910 ms

31/100

30%

CLS (Cumulative Layout Shift)

Value0.061

97/100

15%

TTI (Time to Interactive)

Value11.9 s

16/100

10%

Network Requests Diagram

csdn.net

467 ms

www.csdn.net

1898 ms

tingyun.js

700 ms

g.csdnimg.cn

801 ms

report.js

712 ms

Our browser made a total of 123 requests to load all elements on the main page. We found that 2% of them (2 requests) were addressed to the original Csdn.net, 50% (61 requests) were made to Img-home.csdnimg.cn and 24% (29 requests) were made to G.csdnimg.cn. The less responsive or slowest element that took the longest time to load (3.2 sec) relates to the external source Img-home.csdnimg.cn.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.1 MB (20%)

Content Size

5.5 MB

After Optimization

4.4 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Csdn.net main page is 5.5 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 60% of websites need less resources to load. Images take 4.3 MB which makes up the majority of the site volume.

HTML Optimization

-88%

Potential reduce by 501.3 kB

  • Original 567.6 kB
  • After minification 560.7 kB
  • After compression 66.3 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 501.3 kB or 88% of the original size.

Image Optimization

-14%

Potential reduce by 618.2 kB

  • Original 4.3 MB
  • After minification 3.6 MB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Obviously, CSDN needs image optimization as it can save up to 618.2 kB or 14% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-0%

Potential reduce by 83 B

  • Original 695.4 kB
  • After minification 695.4 kB
  • After compression 695.3 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. This website has mostly compressed JavaScripts.

CSS Optimization

-17%

Potential reduce by 3.7 kB

  • Original 21.7 kB
  • After minification 21.7 kB
  • After compression 18.0 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Csdn.net needs all CSS files to be minified and compressed as it can save up to 3.7 kB or 17% of the original size.

Requests Breakdown

Number of requests can be reduced by 51 (43%)

Requests Now

118

After Optimization

67

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 118 CSS, Javascripts, AJAX and image requests in order to completely render the main page of CSDN. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 22 to 1 for JavaScripts and from 8 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

csdn.net

csdn.net

467 ms

www.csdn.net

www.csdn.net

1898 ms

tingyun.js

tingyun.js

700 ms

g.csdnimg.cn

g.csdnimg.cn

801 ms

report.js

report.js

712 ms

user-ordercart.js

user-ordercart.js

695 ms

csdn-login-box.js

csdn-login-box.js

698 ms

user-ordertip.js

user-ordertip.js

696 ms

csdn-toolbar.js

csdn-toolbar.js

763 ms

common.65f57473.css

common.65f57473.css

777 ms

index.21eb5a02.css

index.21eb5a02.css

731 ms

csdn-footer.js

csdn-footer.js

504 ms

runtime.a34a86f7.js

runtime.a34a86f7.js

286 ms

common.8ef52636.js

common.8ef52636.js

411 ms

index.703a79ce.js

index.703a79ce.js

419 ms

side-toolbar.js

side-toolbar.js

313 ms

user-tooltip.css

user-tooltip.css

54 ms

user-ordertip.css

user-ordertip.css

57 ms

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1473 ms

kunpeng-sc.csdnimg.cn

kunpeng-sc.csdnimg.cn

743 ms

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932 ms

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169 ms

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1748 ms

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1413 ms

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1887 ms

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1417 ms

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1625 ms

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1629 ms

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1836 ms

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1847 ms

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1845 ms

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2050 ms

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2047 ms

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2138 ms

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2095 ms

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2116 ms

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2103 ms

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3103 ms

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2798 ms

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2567 ms

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2321 ms

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2584 ms

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2445 ms

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2634 ms

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2678 ms

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2865 ms

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2846 ms

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2886 ms

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3154 ms

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3063 ms

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3245 ms

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146 ms

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907 ms

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840 ms

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854 ms

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1640 ms

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1488 ms

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1701 ms

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1801 ms

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20230310014808316.jpg

1780 ms

ads.gif

ads.gif

234 ms

trackad.js

trackad.js

236 ms

element-icons.535877f5.woff

element-icons.535877f5.woff

232 ms

DINCond-Black.36f2a9af.ttf

DINCond-Black.36f2a9af.ttf

231 ms

side-toolbar.css

side-toolbar.css

106 ms

get

get

229 ms

hm.js

hm.js

2078 ms

g.csdnimg.cn

g.csdnimg.cn

136 ms

csdn-toolbar-default.css

csdn-toolbar-default.css

91 ms

csdn-notification.js

csdn-notification.js

131 ms

csdn-footer.css

csdn-footer.css

88 ms

tel.png

tel.png

64 ms

email.png

email.png

198 ms

cs.png

cs.png

196 ms

badge.png

badge.png

194 ms

qr.png

qr.png

195 ms

qr_app.png

qr_app.png

195 ms

qr_wechat.png

qr_wechat.png

197 ms

qr_video.png

qr_video.png

198 ms

kefu.png

kefu.png

197 ms

fanhuidingbucopy.png

fanhuidingbucopy.png

197 ms

1.png

1.png

1240 ms

app.9b068e735f456eb77dfc44f6b8260e1f.css

app.9b068e735f456eb77dfc44f6b8260e1f.css

113 ms

g.csdnimg.cn

g.csdnimg.cn

136 ms

manifest.527ea8f46048a2345d08.js

manifest.527ea8f46048a2345d08.js

171 ms

vendor.3af8b84f17486a0222cc.js

vendor.3af8b84f17486a0222cc.js

332 ms

app.16e9c7ef4d456b3c7307.js

app.16e9c7ef4d456b3c7307.js

173 ms

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85 ms

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5.ca3a383f378c1019ab71.js

83 ms

1012400

1012400

920 ms

toolbar1105.json

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1677 ms

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1754 ms

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1871 ms

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1918 ms

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1920 ms

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1961 ms

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1947 ms

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2309 ms

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1952 ms

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1843 ms

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1954 ms

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2109 ms

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1921 ms

hm.gif

hm.gif

1007 ms

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1178 ms

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1186 ms

Accessibility Review

csdn.net accessibility score

68

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

button, link, and menuitem elements do not have accessible names.

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

<dl>'s do not contain only properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements.

Names and labels

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

csdn.net best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

csdn.net SEO score

82

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Links are not crawlable

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Image elements do not have [alt] attributes

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    ZH

  • Language Claimed

    ZH

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Csdn.net can be misinterpreted by Google and other search engines. Our service has detected that Chinese is used on the page, and it matches the claimed language. Our system also found out that Csdn.net main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

csdn.net

Open Graph description is not detected on the main page of CSDN. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: