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down.51cto.com screenshot

Report Summary

  • 0

    Performance

  • 0

    Accessibility

  • 0

    Best Practices

  • 0

    SEO

down.51cto.com

51CTO学堂-IT培训_IT人充电上51CTO学堂

Page Load Speed

31.7 sec in total

First Response

4.4 sec

Resources Loaded

27 sec

Page Rendered

310 ms

down.51cto.com screenshot

About Website

Visit down.51cto.com now to see the best up-to-date Down 51 Cto content for China and also check out these interesting facts you probably never knew about down.51cto.com

51CTO学堂为IT技术人员终生学习提供最丰富的课程资源库,数千名专业讲师和大厂工程师倾力分享了数万门在线视频课程,几乎覆盖了IT技术的各个领域:java、python、php、c、前端、数据库、区块链、运维等，帮助每个渴望成长的IT技术工程师技能提升，学有所成！

Visit down.51cto.com

Key Findings

We analyzed Down.51cto.com page load time and found that the first response time was 4.4 sec and then it took 27.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 95% of websites can load faster.

Performance Metrics

down.51cto.com performance score

0

Network Requests Diagram

down.51cto.com

4370 ms

public.css

4656 ms

index.css

4679 ms

jquery.min.js

2779 ms

public.js

6850 ms

Our browser made a total of 66 requests to load all elements on the main page. We found that 56% of them (37 requests) were addressed to the original Down.51cto.com, 11% (7 requests) were made to Bdimg.share.baidu.com and 5% (3 requests) were made to Home.51cto.com. The less responsive or slowest element that took the longest time to load (10.7 sec) relates to the external source S1.51cto.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 981.2 kB (83%)

Content Size

1.2 MB

After Optimization

205.2 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Down.51cto.com main page is 1.2 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. 25% of websites need less resources to load. HTML takes 873.0 kB which makes up the majority of the site volume.

HTML Optimization

-95%

Potential reduce by 832.2 kB

  • Original 873.0 kB
  • After minification 525.2 kB
  • After compression 40.8 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. This page needs HTML code to be minified as it can gain 347.8 kB, which is 40% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 832.2 kB or 95% of the original size.

Image Optimization

-12%

Potential reduce by 8.8 kB

  • Original 72.0 kB
  • After minification 63.2 kB

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, Down 51 Cto needs image optimization as it can save up to 8.8 kB or 12% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-48%

Potential reduce by 82.7 kB

  • Original 171.9 kB
  • After minification 152.6 kB
  • After compression 89.2 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 82.7 kB or 48% of the original size.

CSS Optimization

-83%

Potential reduce by 57.5 kB

  • Original 69.5 kB
  • After minification 65.7 kB
  • After compression 12.0 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. Down.51cto.com needs all CSS files to be minified and compressed as it can save up to 57.5 kB or 83% of the original size.

Requests Breakdown

Number of requests can be reduced by 38 (59%)

Requests Now

64

After Optimization

26

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 64 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Down 51 Cto. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 24 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

down.51cto.com

down.51cto.com

4370 ms

public.css

public.css

4656 ms

index.css

index.css

4679 ms

jquery.min.js

jquery.min.js

2779 ms

public.js

public.js

6850 ms

imgscal.js

imgscal.js

1806 ms

thorTo.min.js

thorTo.min.js

6623 ms

master.js

master.js

3135 ms

module.css

module.css

4963 ms

index_1_down.js

index_1_down.js

1920 ms

art_master_top.css

art_master_top.css

1920 ms

51cto.js

51cto.js

3550 ms

jquery.message.js

jquery.message.js

5192 ms

usernew.srv16.php

usernew.srv16.php

2703 ms

boyka.js

boyka.js

8934 ms

index.php

index.php

956 ms

Down_PNG.js

Down_PNG.js

2631 ms

doutip.srv.php

doutip.srv.php

2724 ms

count.js

count.js

608 ms

stat.php

stat.php

2488 ms

down_ajax.php

down_ajax.php

1999 ms

top_bg_xian.gif

top_bg_xian.gif

433 ms

nav_ico1.gif

nav_ico1.gif

359 ms

top_bg.gif

top_bg.gif

397 ms

logo_xz.png

logo_xz.png

10028 ms

slgon.png

slgon.png

395 ms

img4.png

img4.png

1294 ms

sina.png

sina.png

6751 ms

person.png

person.png

790 ms

bean.png

bean.png

802 ms

top_shequ.gif

top_shequ.gif

850 ms

b_arro_down.png

b_arro_down.png

1177 ms

serchbtn.png

serchbtn.png

1196 ms

pub_icon.png

pub_icon.png

1573 ms

onload.gif

onload.gif

1602 ms

colprobg.png

colprobg.png

1688 ms

dot.png

dot.png

1874 ms

praise_star.png

praise_star.png

1960 ms

part_weibo.png

part_weibo.png

2201 ms

part_douban.png

part_douban.png

2266 ms

part_renren.png

part_renren.png

3521 ms

weekly_side.png

weekly_side.png

2591 ms

tit_bg4_1.gif

tit_bg4_1.gif

2677 ms

anchor_qq.png

anchor_qq.png

3130 ms

ajs.php

ajs.php

1108 ms

wKiom1bfuiriJWYSAAC6HUrCVbk900.jpg

wKiom1bfuiriJWYSAAC6HUrCVbk900.jpg

10748 ms

lg.php

lg.php

1103 ms

down_ajax.php

down_ajax.php

1979 ms

h.js

h.js

989 ms

share.js

share.js

594 ms

21.gif

21.gif

645 ms

analytics.js

analytics.js

23 ms

pageview.php

pageview.php

934 ms

hm.gif

hm.gif

339 ms

stat.htm

stat.htm

185 ms

core.php

core.php

2808 ms

collect

collect

21 ms

collect

collect

113 ms

adx.js

adx.js

907 ms

pic.gif

pic.gif

807 ms

share_api.js

share_api.js

352 ms

share_view.js

share_view.js

662 ms

tangram.js

tangram.js

3544 ms

api_base.js

api_base.js

1693 ms

view_base.js

view_base.js

1678 ms

logger.js

logger.js

614 ms

SEO Factors

down.51cto.com SEO score

0

Language and Encoding

  • Language Detected

    ZH

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Down.51cto.com can be misinterpreted by Google and other search engines. Our service has detected that Chinese is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Down.51cto.com 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

down.51cto.com

Open Graph description is not detected on the main page of Down 51 Cto. 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: