Tools & Wizards About Us
itcast.cn screenshot

Report Summary

  • 29

    Performance

    Renders faster than
    49% of other websites

  • 39

    Accessibility

    Visual factors better than
    that of 19% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 92

    SEO

    Google-friendlier than
    74% of websites

itcast.cn

传智教育【官网】-好口碑IT职业教育,好口碑IT培训机构，一样的教育，不一样的品质

Page Load Speed

28.7 sec in total

First Response

638 ms

Resources Loaded

27.4 sec

Page Rendered

723 ms

itcast.cn screenshot

About Website

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.cn

Key Findings

We 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 an excellent result, as only a small number of websites can load faster.

Performance Metrics

itcast.cn performance score

29

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value7.7 s

0/100

10%

LCP (Largest Contentful Paint)

Value15.7 s

0/100

25%

SI (Speed Index)

Value32.0 s

0/100

10%

TBT (Total Blocking Time)

Value380 ms

69/100

30%

CLS (Cumulative Layout Shift)

Value0.231

54/100

15%

TTI (Time to Interactive)

Value25.7 s

0/100

10%

Network Requests Diagram

itcast.cn

638 ms

itcast.cn

878 ms

www.itcast.cn

1626 ms

reset.css

518 ms

jquery.flipster.css

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 Optimization Overview & Recommendations

Page size can be reduced by 2.1 MB (12%)

Content Size

18.1 MB

After Optimization

16.0 MB

  • HTML
  • Images
  • JavaScript
  • CSS

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.

HTML Optimization

-80%

Potential reduce by 160.0 kB

  • Original 198.9 kB
  • After minification 189.0 kB
  • After compression 39.0 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.

Image Optimization

-11%

Potential reduce by 1.9 MB

  • Original 17.4 MB
  • After minification 15.5 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.

JavaScript Optimization

-8%

Potential reduce by 30.5 kB

  • Original 387.6 kB
  • After minification 386.4 kB
  • After compression 357.1 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

-15%

Potential reduce by 9.6 kB

  • Original 66.1 kB
  • After minification 66.1 kB
  • After compression 56.5 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.

Requests Breakdown

Number of requests can be reduced by 45 (14%)

Requests Now

331

After Optimization

286

  • AJAX
  • Images
  • JavaScript
  • CSS

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.

Network Requests Diagram

itcast.cn

itcast.cn

638 ms

itcast.cn

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675 ms

invite-close.png

invite-close.png

676 ms

defaultPhoto.png

defaultPhoto.png

1085 ms

small.png

small.png

708 ms

big.png

big.png

725 ms

close.png

close.png

754 ms

moor_chat.html

moor_chat.html

1145 ms

jylai2.png

jylai2.png

6795 ms

jylui2.png

jylui2.png

6954 ms

jyltest2.png

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6774 ms

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6903 ms

moor_style-c3422f4c70.css

moor_style-c3422f4c70.css

335 ms

idangerous_swiper-9998bd2b30.css

idangerous_swiper-9998bd2b30.css

242 ms

iconfont.css

iconfont.css

225 ms

m7AllQuote.js

m7AllQuote.js

2009 ms

jdate.js

jdate.js

268 ms

distpicker.data.js

distpicker.data.js

523 ms

distpicker.js

distpicker.js

455 ms

idangerous_swiper.js

idangerous_swiper.js

517 ms

base64.min.js

base64.min.js

486 ms

fileTypeMap.js

fileTypeMap.js

523 ms

swiper-bundle.min.js

swiper-bundle.min.js

598 ms

jylpm2.png

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jyljcdl2.png

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hot.png

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right_float_icon.png

right_float_icon.png

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continue-advisory.png

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close-icon.png

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video-invite.png

video-invite.png

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socket.io-2.3.0.js

socket.io-2.3.0.js

523 ms

iconfont.woff

iconfont.woff

468 ms

7moorChat-93c81b84ae.js

7moorChat-93c81b84ae.js

879 ms

chat

chat

484 ms

clack.min.js

clack.min.js

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chat

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240 ms

Accessibility Review

itcast.cn accessibility score

39

Accessibility Issues

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.

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

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

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

High

<html> element does not have a [lang] attribute

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

itcast.cn 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

Page has valid source maps

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

itcast.cn SEO score

92

Search Engine Optimization Advices

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

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 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.

Social Sharing Optimization

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: