Tools & Wizards About Us

Report Summary

  • 45

    Performance

    Renders faster than
    64% of other websites

  • 71

    Accessibility

    Visual factors better than
    that of 36% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 75

    SEO

    Google-friendlier than
    32% of websites

vko.cn

微课网-助力培养自主学习力

Page Load Speed

31.1 sec in total

First Response

2.5 sec

Resources Loaded

28.1 sec

Page Rendered

445 ms

About Website

Visit vko.cn now to see the best up-to-date Vko content for China and also check out these interesting facts you probably never knew about vko.cn

微课网成立于2011年，在中国教育改革的大背景下，多年专注小初高在线辅导资源研发制作，资源以培养学生自主学习能力为目标，提供各年级各学科在线教育微课程视频资源，追求中国学生学习过程的逐步优化。

Visit vko.cn

Key Findings

We analyzed Vko.cn page load time and found that the first response time was 2.5 sec and then it took 28.6 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

vko.cn performance score

45

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.5 s

36/100

10%

LCP (Largest Contentful Paint)

Value6.7 s

8/100

25%

SI (Speed Index)

Value7.0 s

33/100

10%

TBT (Total Blocking Time)

Value30 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.996

2/100

15%

TTI (Time to Interactive)

Value6.6 s

57/100

10%

Network Requests Diagram

vko.cn

2500 ms

www.vko.cn

4609 ms

base.css

1797 ms

stacktrace.js

1413 ms

vkofileloader.js

2084 ms

Our browser made a total of 105 requests to load all elements on the main page. We found that 6% of them (6 requests) were addressed to the original Vko.cn, 87% (91 requests) were made to Static.vko.cn and 3% (3 requests) were made to Hm.baidu.com. The less responsive or slowest element that took the longest time to load (12.6 sec) relates to the external source Cdn.vkoimg.cn.

Page Optimization Overview & Recommendations

Page size can be reduced by 178.1 kB (17%)

Content Size

1.0 MB

After Optimization

849.9 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Vko.cn main page is 1.0 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. 30% of websites need less resources to load. Images take 810.0 kB which makes up the majority of the site volume.

HTML Optimization

-76%

Potential reduce by 33.0 kB

  • Original 43.2 kB
  • After minification 36.4 kB
  • After compression 10.2 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 6.9 kB, which is 16% 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 33.0 kB or 76% of the original size.

Image Optimization

-5%

Potential reduce by 37.8 kB

  • Original 810.0 kB
  • After minification 772.2 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. Vko images are well optimized though.

JavaScript Optimization

-10%

Potential reduce by 5.0 kB

  • Original 50.0 kB
  • After minification 49.6 kB
  • After compression 45.1 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

-82%

Potential reduce by 102.3 kB

  • Original 124.7 kB
  • After minification 96.5 kB
  • After compression 22.4 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. Vko.cn needs all CSS files to be minified and compressed as it can save up to 102.3 kB or 82% of the original size.

Requests Breakdown

Number of requests can be reduced by 69 (67%)

Requests Now

103

After Optimization

34

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 103 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Vko. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 51 to 1 for JavaScripts and from 12 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

vko.cn accessibility score

71

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

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

vko.cn 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

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

vko.cn SEO score

75

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

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

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Vko.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 Vko.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

Open Graph description is not detected on the main page of Vko. 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: