Tools & Wizards About Us
itcast.cn screenshot

Report Summary

  • 15

    Performance

    Renders faster than
    27% of other websites

  • 42

    Accessibility

    Visual factors better than
    that of 18% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 92

    SEO

    Google-friendlier than
    75% 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

66.3 sec in total

First Response

10 sec

Resources Loaded

55.6 sec

Page Rendered

705 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 10 sec and then it took 56.3 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. Unfortunately, there were 51 request timeouts, which can generally increase the web page load time, as the browser stays idle while waiting for website response.

Performance Metrics

itcast.cn performance score

15

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value7.4 s

1/100

10%

LCP (Largest Contentful Paint)

Value17.5 s

0/100

25%

SI (Speed Index)

Value13.4 s

2/100

10%

TBT (Total Blocking Time)

Value1,160 ms

22/100

30%

CLS (Cumulative Layout Shift)

Value0.231

54/100

15%

TTI (Time to Interactive)

Value30.0 s

0/100

10%

Network Requests Diagram

www.itcast.cn

9960 ms

reset.css

1143 ms

style.css

3425 ms

index.css

1444 ms

banner.css

1461 ms

Our browser made a total of 109 requests to load all elements on the main page. We found that 57% of them (62 requests) were addressed to the original Itcast.cn, 18% (20 requests) were made to Bbs.itcast.cn and 5% (5 requests) were made to I.itcast.cn. The less responsive or slowest element that took the longest time to load (20.5 sec) belongs to the original domain Itcast.cn.

Page Optimization Overview & Recommendations

Page size can be reduced by 253.3 kB (52%)

Content Size

487.1 kB

After Optimization

233.8 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Itcast.cn main page is 487.1 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. 20% of websites need less resources to load. HTML takes 212.3 kB which makes up the majority of the site volume.

HTML Optimization

-90%

Potential reduce by 191.7 kB

  • Original 212.3 kB
  • After minification 180.3 kB
  • After compression 20.6 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 32.0 kB, which is 15% 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 191.7 kB or 90% of the original size.

Image Optimization

-13%

Potential reduce by 20.0 kB

  • Original 156.9 kB
  • After minification 136.9 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, Itcast needs image optimization as it can save up to 20.0 kB or 13% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-23%

Potential reduce by 21.6 kB

  • Original 92.2 kB
  • After minification 91.1 kB
  • After compression 70.6 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 21.6 kB or 23% of the original size.

CSS Optimization

-78%

Potential reduce by 20.0 kB

  • Original 25.8 kB
  • After minification 21.9 kB
  • After compression 5.7 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 20.0 kB or 78% of the original size.

Requests Breakdown

Number of requests can be reduced by 25 (45%)

Requests Now

55

After Optimization

30

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 55 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 11 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

www.itcast.cn

www.itcast.cn

9960 ms

reset.css

reset.css

1143 ms

style.css

style.css

3425 ms

index.css

index.css

1444 ms

banner.css

banner.css

1461 ms

logo.png

logo.png

5762 ms

2016.gif

2016.gif

2273 ms

openbg.jpg

openbg.jpg

2406 ms

kubg.jpg

kubg.jpg

2430 ms

yunbg.jpg

yunbg.jpg

3664 ms

studybg.jpg

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3376 ms

bybg.jpg

bybg.jpg

4696 ms

cmobg.jpg

cmobg.jpg

6535 ms

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20117 ms

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14657 ms

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20117 ms

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20118 ms

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20120 ms

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20121 ms

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20121 ms

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20205 ms

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20206 ms

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20205 ms

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20206 ms

tj2.jpg

tj2.jpg

20205 ms

java.png

java.png

20206 ms

android.png

android.png

20377 ms

php.png

php.png

20378 ms

ui.png

ui.png

20378 ms

ios.png

ios.png

20379 ms

newcourse

newcourse

1265 ms

web.png

web.png

19846 ms

c.png

c.png

19714 ms

m.png

m.png

19690 ms

api.php

api.php

1355 ms

api.php

api.php

1483 ms

api.php

api.php

1479 ms

api.php

api.php

1869 ms

stat.php

stat.php

1041 ms

RqwnZJ0

RqwnZJ0

540 ms

wpa.php

wpa.php

1155 ms

zx.css

zx.css

19727 ms

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11937 ms

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2524 ms

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19580 ms

568a21147a7e5.jpg

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10434 ms

jquery-1.7.2.min.js

jquery-1.7.2.min.js

19580 ms

global.js

global.js

20453 ms

newcourse

newcourse

1189 ms

newcourse

newcourse

1322 ms

newcourseby

newcourseby

2735 ms

newcourse

newcourse

1567 ms

index.js

index.js

20376 ms

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19521 ms

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19521 ms

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150606b0106eumsebesr3l.gif

19521 ms

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19521 ms

zx.js

zx.js

20420 ms

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10934 ms

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20388 ms

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12520 ms

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20388 ms

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20382 ms

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20383 ms

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20383 ms

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20383 ms

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20000 ms

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20001 ms

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20000 ms

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20000 ms

stat.htm

stat.htm

523 ms

core.php

core.php

559 ms

9.gif

9.gif

1866 ms

ApiGo

ApiGo

1363 ms

jquery.SuperSlide.2.1.1.js

jquery.SuperSlide.2.1.1.js

20353 ms

iconfont.woff

iconfont.woff

19582 ms

app.gif

app.gif

841 ms

game.png

game.png

12804 ms

yun.png

yun.png

9874 ms

course_bg.png

course_bg.png

6440 ms

wx_cz.jpg

wx_cz.jpg

8819 ms

wx_hm.jpg

wx_hm.jpg

9924 ms

360.jpg

360.jpg

9644 ms

chengxin.jpg

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7965 ms

safe.jpg

safe.jpg

9715 ms

zx_11.png

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9795 ms

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11154 ms

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10145 ms

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19989 ms

Panel.js

Panel.js

679 ms

localStorage.js

localStorage.js

940 ms

contains.js

contains.js

227 ms

r.cgi

r.cgi

690 ms

r.cgi

r.cgi

719 ms

ta.php

ta.php

563 ms

crmqq.php

crmqq.php

6278 ms

wpa_first_heart_beat.php

wpa_first_heart_beat.php

612 ms

iconfont.ttf

iconfont.ttf

0 ms

hb.crm2.qq.com

hb.crm2.qq.com

3278 ms

hb.crm2.qq.com

hb.crm2.qq.com

1205 ms

Accessibility Review

itcast.cn accessibility score

42

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.

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

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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

    ZH

  • 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 it matches the claimed language. 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: