8.3 sec in total
2.8 sec
5.3 sec
274 ms
Visit 52opencourse.com now to see the best up-to-date 52 Opencourse content for China and also check out these interesting facts you probably never knew about 52opencourse.com
为中国学生提供一个开放、免费、高质量以及世界级的公开课中文分享与交流平台。
Visit 52opencourse.comWe analyzed 52opencourse.com page load time and found that the first response time was 2.8 sec and then it took 5.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.
52opencourse.com performance score
name
value
score
weighting
Value3.6 s
31/100
10%
Value3.6 s
60/100
25%
Value5.8 s
50/100
10%
Value330 ms
76/100
30%
Value0
100/100
15%
Value5.1 s
76/100
10%
2786 ms
164 ms
806 ms
324 ms
1747 ms
Our browser made a total of 22 requests to load all elements on the main page. We found that 27% of them (6 requests) were addressed to the original 52opencourse.com, 18% (4 requests) were made to Pagead2.googlesyndication.com and 18% (4 requests) were made to Tpc.googlesyndication.com. The less responsive or slowest element that took the longest time to load (2.8 sec) belongs to the original domain 52opencourse.com.
Page size can be reduced by 353.4 kB (69%)
509.9 kB
156.6 kB
In fact, the total size of 52opencourse.com main page is 509.9 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 30% of websites need less resources to load. Javascripts take 408.5 kB which makes up the majority of the site volume.
Potential reduce by 65.6 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 9.6 kB, which is 13% 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 65.6 kB or 86% of the original size.
Potential reduce by 46 B
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. 52 Opencourse images are well optimized though.
Potential reduce by 269.4 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 269.4 kB or 66% of the original size.
Potential reduce by 18.3 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. 52opencourse.com needs all CSS files to be minified and compressed as it can save up to 18.3 kB or 83% of the original size.
Number of requests can be reduced by 10 (48%)
21
11
The browser has sent 21 CSS, Javascripts, AJAX and image requests in order to completely render the main page of 52 Opencourse. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 11 to 1 for JavaScripts and as a result speed up the page load time.
52opencourse.com
2786 ms
qa-styles.css
164 ms
jquery-1.7.1.min.js
806 ms
qa-page.js
324 ms
MathJax.js
1747 ms
show_ads.js
5 ms
piwik.js
26 ms
TeX-AMS-MML_HTMLorMML.js
691 ms
vote-buttons.gif
236 ms
zrt_lookup.html
38 ms
show_ads_impl.js
49 ms
ads
274 ms
feed-icon-14x14.png
164 ms
osd.js
24 ms
css
70 ms
m_js_controller.js
72 ms
abg.js
87 ms
googlelogo_color_112x36dp.png
37 ms
nessie_icon_tiamat_white.png
31 ms
s
15 ms
x_button_blue2.png
11 ms
Tqng9ngJVK4Gqvh3e602hP-HqlN49KFEUSDtmrOPmWo.js
3 ms
52opencourse.com accessibility score
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
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
Form elements do not have associated labels
52opencourse.com best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Detected JavaScript libraries
Issues were logged in the Issues panel in Chrome Devtools
52opencourse.com SEO score
ZH
N/A
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise 52opencourse.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 52opencourse.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.
52opencourse.com
Open Graph description is not detected on the main page of 52 Opencourse. 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: