Tools & Wizards About Us
icourse163.org screenshot

Report Summary

  • 10

    Performance

    Renders faster than
    23% of other websites

  • 54

    Accessibility

    Visual factors better than
    that of 23% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 77

    SEO

    Google-friendlier than
    36% of websites

icourse163.org

中国大学MOOC_优质在线课程学习平台

Page Load Speed

8.2 sec in total

First Response

709 ms

Resources Loaded

7.4 sec

Page Rendered

70 ms

icourse163.org screenshot

About Website

Visit icourse163.org now to see the best up-to-date Icourse 163 content for China and also check out these interesting facts you probably never knew about icourse163.org

中国大学MOOC(慕课) 是爱课程网携手网易云课堂打造的在线学习平台，每一个有提升愿望的人，都可以在这里学习中国优质的大学课程，学完还能获得认证证书。中国大学MOOC是国内优质的中文MOOC学习平台，拥有众多985高校的大学课程，与名师零距离。

Visit icourse163.org

Key Findings

We analyzed Icourse163.org page load time and found that the first response time was 709 ms and then it took 7.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 85% of websites can load faster.

Performance Metrics

icourse163.org performance score

10

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value10.6 s

0/100

10%

LCP (Largest Contentful Paint)

Value32.0 s

0/100

25%

SI (Speed Index)

Value18.2 s

0/100

10%

TBT (Total Blocking Time)

Value1,610 ms

12/100

30%

CLS (Cumulative Layout Shift)

Value0.297

40/100

15%

TTI (Time to Interactive)

Value17.1 s

4/100

10%

Network Requests Diagram

icourse163.org

709 ms

www.icourse163.org

1082 ms

libI18nHook_8e5137134f87873a49bef0e6d69ee8b8.js

1249 ms

libEsShim_0e05204ba68c8863b2c2758466388378.js

1440 ms

libBabelPolyfill_c031d28617dd4b22570c653823004fda.js

1263 ms

Our browser made a total of 61 requests to load all elements on the main page. We found that 11% of them (7 requests) were addressed to the original Icourse163.org, 38% (23 requests) were made to Mc.stu.126.net and 21% (13 requests) were made to Edu-image.nosdn.127.net. The less responsive or slowest element that took the longest time to load (2.1 sec) relates to the external source Edu-cms.nosdn.127.net.

Page Optimization Overview & Recommendations

Page size can be reduced by 460.2 kB (27%)

Content Size

1.7 MB

After Optimization

1.3 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Icourse163.org main page is 1.7 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. 45% of websites need less resources to load. Javascripts take 1.2 MB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 245.4 kB

  • Original 312.1 kB
  • After minification 309.4 kB
  • After compression 66.7 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 245.4 kB or 79% of the original size.

Image Optimization

-17%

Potential reduce by 23.5 kB

  • Original 139.9 kB
  • After minification 116.4 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, Icourse 163 needs image optimization as it can save up to 23.5 kB or 17% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-15%

Potential reduce by 180.3 kB

  • Original 1.2 MB
  • After minification 1.2 MB
  • After compression 1.0 MB

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 180.3 kB or 15% of the original size.

CSS Optimization

-23%

Potential reduce by 11.0 kB

  • Original 47.2 kB
  • After minification 47.2 kB
  • After compression 36.3 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. Icourse163.org needs all CSS files to be minified and compressed as it can save up to 11.0 kB or 23% of the original size.

Requests Breakdown

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

Requests Now

56

After Optimization

31

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 56 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Icourse 163. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 26 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

icourse163.org

icourse163.org

709 ms

www.icourse163.org

www.icourse163.org

1082 ms

libI18nHook_8e5137134f87873a49bef0e6d69ee8b8.js

libI18nHook_8e5137134f87873a49bef0e6d69ee8b8.js

1249 ms

libEsShim_0e05204ba68c8863b2c2758466388378.js

libEsShim_0e05204ba68c8863b2c2758466388378.js

1440 ms

libBabelPolyfill_c031d28617dd4b22570c653823004fda.js

libBabelPolyfill_c031d28617dd4b22570c653823004fda.js

1263 ms

libClamp_7c4afc5c2e098e22b94d3c3fdac6edea.js

libClamp_7c4afc5c2e098e22b94d3c3fdac6edea.js

1275 ms

libDevice_70d69446a592ed53bab12b22bca6200a.js

libDevice_70d69446a592ed53bab12b22bca6200a.js

1279 ms

mooc_moment_afb34315eef15ca86723c56885e6127f.js

mooc_moment_afb34315eef15ca86723c56885e6127f.js

1359 ms

rxjs.umd.min_7f27cccc1cc810f59b4daed7605cf42b.js

rxjs.umd.min_7f27cccc1cc810f59b4daed7605cf42b.js

1701 ms

message4.js

message4.js

1328 ms

tool.min.js

tool.min.js

1192 ms

bootstrap.js

bootstrap.js

1639 ms

DATracker.sync.1.6.11.js

DATracker.sync.1.6.11.js

1556 ms

regular_mooc_855ddae161eaf47db272efc166066966.js

regular_mooc_855ddae161eaf47db272efc166066966.js

1852 ms

antd-fix-v4.24.5_c294eccb6205048081aae43b83feb6e5.css

antd-fix-v4.24.5_c294eccb6205048081aae43b83feb6e5.css

2088 ms

pt_web_index.web_ff6dcdae27c77fd74c85683b280e6d51.css

pt_web_index.web_ff6dcdae27c77fd74c85683b280e6d51.css

1444 ms

core_ee634a87510ab7b1b7c9e2339881bd7c.js

core_ee634a87510ab7b1b7c9e2339881bd7c.js

1729 ms

pt_web_index.web_fdbaa0984936811ebe50b18dac8127e8.js

pt_web_index.web_fdbaa0984936811ebe50b18dac8127e8.js

1696 ms

hm.js

hm.js

1295 ms

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3310f128e53b406f94400f7ae6046db2.png

1027 ms

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6630234335885341999.png

1137 ms

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a872f61717094039878d7ed7f557abbb.png

1150 ms

f24bc450d3c643dd9fb61e4c77928acd.png

f24bc450d3c643dd9fb61e4c77928acd.png

966 ms

ceff46a7-e151-4a3a-b208-90e41721870c.jpg

ceff46a7-e151-4a3a-b208-90e41721870c.jpg

1604 ms

loading.gif

loading.gif

204 ms

log.do

log.do

1091 ms

icon-mooc.ttf

icon-mooc.ttf

220 ms

js

js

909 ms

recommendRPCBean.getMaxWeightAdvertisementToWeb.rpc

recommendRPCBean.getMaxWeightAdvertisementToWeb.rpc

213 ms

push.js

push.js

1336 ms

runtime.d461e0b8.js

runtime.d461e0b8.js

211 ms

reactBase~1f20a385.da452c2e.chunk.js

reactBase~1f20a385.da452c2e.chunk.js

416 ms

reduxBase~bb0ee5db.01c359a2.chunk.js

reduxBase~bb0ee5db.01c359a2.chunk.js

208 ms

axiosBase~e4173fa2.66d50cf7.chunk.js

axiosBase~e4173fa2.66d50cf7.chunk.js

214 ms

vendors~253ae210.52046e5e.chunk.js

vendors~253ae210.52046e5e.chunk.js

492 ms

vendors~7d359b94.18c75e1d.chunk.js

vendors~7d359b94.18c75e1d.chunk.js

408 ms

vendors~678f84af.bf1d34e8.chunk.js

vendors~678f84af.bf1d34e8.chunk.js

421 ms

IndexWeb~748942c6.768b1573.chunk.js

IndexWeb~748942c6.768b1573.chunk.js

453 ms

commonutil_5193e934bbed091ab75ebc7fbfcca2c3.html

commonutil_5193e934bbed091ab75ebc7fbfcca2c3.html

388 ms

tp_shared_desktop_modules_commonutil_commonutil_9c2fbe6666451f3d625eda5a1854d998.js

tp_shared_desktop_modules_commonutil_commonutil_9c2fbe6666451f3d625eda5a1854d998.js

207 ms

hm.gif

hm.gif

319 ms

downloadQR.png

downloadQR.png

215 ms

MoocSearchInputBox~748942c6.1df6e096.chunk.js

MoocSearchInputBox~748942c6.1df6e096.chunk.js

243 ms

channelBean.listChannelCategoryDetail.rpc

channelBean.listChannelCategoryDetail.rpc

656 ms

indexBeanV3.getCertificationTestResult.rpc

indexBeanV3.getCertificationTestResult.rpc

208 ms

ui_appbanner_closebtn.png

ui_appbanner_closebtn.png

1490 ms

indexBeanV3.getTopAndLowerRightCornerBar.rpc

indexBeanV3.getTopAndLowerRightCornerBar.rpc

424 ms

weixinQR.png

weixinQR.png

209 ms

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781ea44d125b4d05a4059b7c29b49ee9.png

335 ms

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664 ms

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664 ms

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671 ms

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672 ms

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673 ms

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672 ms

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ffa896a11bc240258c07ea6dcb4378d1.png

673 ms

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351 ms

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C98738F71B5E662F0239FA9D59D88011.png

663 ms

ui_appbanner_jt.png

ui_appbanner_jt.png

1531 ms

watchman.min.js

watchman.min.js

195 ms

d

d

406 ms

Accessibility Review

icourse163.org accessibility score

54

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

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

icourse163.org best practices score

67

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

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

icourse163.org SEO score

77

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Links are not crawlable

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 doesn't use 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 Icourse163.org 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 Icourse163.org 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

icourse163.org

Open Graph data is detected on the main page of Icourse 163. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: