28.7 sec in total
638 ms
27.4 sec
723 ms
Visit itcast.cn now to see the best up-to-date Itcast content for China and also check out these interesting facts you probably never knew about itcast.cn
传智教育(“传智播客”全新升级为“传智教育”)专注IT培训,开设多种IT培训课程,提供java培训、鸿蒙培训、前端开发培训、鸿蒙开发培训、嵌入式培训、嵌入式开发培训、大数据培训、人工智能培训、python培训、web前端培训、软件测试培训、ui设计培训、移动开发培训、新媒体运营培训、产品经理培训等IT培训服务,是好口碑的IT培训机构。
Visit itcast.cnWe analyzed Itcast.cn page load time and found that the first response time was 638 ms and then it took 28.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 95% of websites can load faster.
itcast.cn performance score
name
value
score
weighting
Value7.7 s
0/100
10%
Value15.7 s
0/100
25%
Value32.0 s
0/100
10%
Value380 ms
69/100
30%
Value0.231
54/100
15%
Value25.7 s
0/100
10%
638 ms
878 ms
1626 ms
518 ms
838 ms
Our browser made a total of 339 requests to load all elements on the main page. We found that 56% of them (189 requests) were addressed to the original Itcast.cn, 21% (71 requests) were made to Yun.itheima.com and 10% (34 requests) were made to Webchat.7moor.com. The less responsive or slowest element that took the longest time to load (9.6 sec) belongs to the original domain Itcast.cn.
Page size can be reduced by 2.1 MB (12%)
18.1 MB
16.0 MB
In fact, the total size of Itcast.cn main page is 18.1 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. 80% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 17.4 MB which makes up the majority of the site volume.
Potential reduce by 160.0 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 160.0 kB or 80% of the original size.
Potential reduce by 1.9 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, Itcast needs image optimization as it can save up to 1.9 MB or 11% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 30.5 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.
Potential reduce by 9.6 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. Itcast.cn needs all CSS files to be minified and compressed as it can save up to 9.6 kB or 15% of the original size.
Number of requests can be reduced by 45 (14%)
331
286
The browser has sent 331 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Itcast. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 30 to 1 for JavaScripts and from 11 to 1 for CSS and as a result speed up the page load time.
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itcast.cn 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
<frame> or <iframe> elements do not have a title
Image elements do not have [alt] attributes
Links do not have a discernible name
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
Heading elements are not in a sequentially-descending order
Internationalization and localization
These are opportunities to improve the interpretation of your content by users in different locales.
Impact
Issue
<html> element does not have a [lang] attribute
Best practices
These items highlight common accessibility best practices.
Impact
Issue
[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.
itcast.cn best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Detected JavaScript libraries
Page has valid source maps
Issues were logged in the Issues panel in Chrome Devtools
itcast.cn SEO score
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
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
Document uses legible font sizes
ZH
N/A
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Itcast.cn 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 Itcast.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.
itcast.cn
Open Graph description is not detected on the main page of Itcast. 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: