Analyze

中国公开课是央视网在线教育平台,汇集国内外名校的优质课程,积极传播中国传统文化,建成包括大学、初高中、小学及社会课程在内的全内容体系,覆盖经济学、管理学、文学、历史等广泛学科,独家策划制作原创精品课程,邀请专家学者、名师等答疑解惑、互动分享。

Page load speed analysis

  • 60/100

    Normal result
  • 7

    Successful tests
  • 1

    Failed test
  • First response

    1.5 sec

  • Resources loaded

    7.6 sec

  • Page rendered

    820 ms

  • Total page load time

    10 sec

Click here to check amazing Opencla Cntv content for China. Otherwise, check out these important facts you probably never knew about opencla.cntv.cn

We analyzed Opencla.cntv.cn page load time and found that the first response time was 1.5 sec and then it took 8.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 85% of websites can load faster.

Page optimization

  • HTML 184.6 kB
    Images 941.2 kB
    Javascripts 301.4 kB
    CSS 37.0 kB

    In fact, the total size of Opencla.cntv.cn main page is 1.5 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. 65% of websites need less resources to load. Images take 941.2 kB which makes up the majority of the site volume.

    • Original 184.6 kB
    • After minification 164.1 kB
    • After compression 31.8 kB

    HTML optimization

    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 20.5 kB, which is 11% 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 152.8 kB or 83% of the original size.

    • Original 941.2 kB
    • After optimization 785.3 kB

    Image optimization

    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, Opencla Cntv needs image optimization as it can save up to 155.8 kB or 17% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

    • Original 301.4 kB
    • After minification 289.3 kB
    • After compression 101.8 kB

    JavaScript optimization

    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 199.6 kB or 66% of the original size.

    • Original 37.0 kB
    • After minification 33.9 kB
    • After compression 6.8 kB

    CSS optimization

    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. Opencla.cntv.cn needs all CSS files to be minified and compressed as it can save up to 30.2 kB or 82% of the original size.

Network requests diagram

  • opencla.cntv.cn
  • a2.js
  • style.css
  • jquery-1.7.2.min.js
  • login.js
  • style.css
  • webtvsuggest.php
  • ProBox.js
  • style.css
  • style.css
  • main.js
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  • wangjing.gif
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  • bg_top_h_tile.jpg
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  • hd_search_btn.gif
  • nav_bg.gif
  • nav_curbg.jpg
  • nav_li_bg.gif
  • icon_hot.png
  • index
  • index
  • index
  • index
  • kcjs_title_12908_150731.jpg
  • biao_titlebg_12908_150731.jpg
  • tab1_cur_12908_150731.jpg
  • tab2_cur_12908_150731.jpg
  • p_bottom_12908_150731.jpg
  • md_title.jpg
  • fdbg.png
  • gaoz_title.gif
  • icon_play.jpg
  • icon.gif
  • mk_bg.jpg
  • md02_title.gif
  • daxue_title.gif
  • mo_title_12908_150520.gif
  • mo_title1_12908_150520.gif
  • icon_play_12908_150520.jpg
  • icon.gif
  • gaoz_ico.gif
  • chuz_ico.gif
  • minxue_ico.gif
  • zyke_ico.gif
  • md03_title.gif
  • icon_play.jpg
  • pre_12908_150521.gif
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  • chuz_title.gif
  • minxue_title.gif
  • zyke_title.gif
  • ysjp_title.gif
  • xksx_title.jpg
  • icon_03.gif
  • md_title.jpg
  • gpt.js
  • webdig.js
  • pubads_impl_81.js
  • container.html
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  • PLAY_1320140181753687.pjpeg
  • lunbo_i_12908_150521.gif
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Our browser made a total of 177 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Opencla.cntv.cn, 74% (131 requests) were made to P1.img.cctvpic.com and 6% (10 requests) were made to P5.img.cctvpic.com. The less responsive or slowest element that took the longest time to load (2.8 sec) relates to the external source Api.search.cntv.cn.

Additional info on opencla.cntv.cn

Requests

The browser has sent 149 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Opencla Cntv. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 12 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

12

Javascripts

132

Images

4

CSS

1

AJAX

149

All

Possible request optimization

1

Javascripts

89

Images

1

CSS

1

AJAX

57

Optimized

92

All

Normal result

IP address

This IP address is dedicated to Opencla.cntv.cn. This is the best domain hosting practice .

Good result

IP Trace

DNS records

Type Host Target/ip TTL Other
A

a1835.r.akamai.net

23.222.28.195 20
A

a1835.r.akamai.net

23.222.28.217 20
CNAME

opencla.cntv.cn

g2.cctvgeo.akadns.net 4800

Language and encoding

Good result

Language

N/A  language flag

Detected

N/A  language flag

Claimed

Encoding

UTF-8

Claimed

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Opencla.cntv.cn can be misinterpreted by Google and other search engines. Unfortunately we cannot identify language used on the page (probably there is a mix of languages, too little text or something else) and no language is claimed in <html> or <meta> tags either. Our system also found out that Opencla.cntv.cn 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.

HTTPS certificate

SSL Certificate

Opencla.cntv.cn has no SSL certificate. Web browsing can be safer with HTTPS connection, so we suggest that it should be obtained for this site.

Normal result

Visitor World Map

Country of origin for 93% of all visits is China. Unfortunately, we cannot track the location of Opencla.cntv.cn server and thus cannot define if the distance between their user base and server can potentially affect the page load time

Good result

Poor result

Social Sharing Optimization

Open Graph description is not detected on the main page of Opencla Cntv. 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:

opencla.cntv.cn

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