Tools & Wizards About Us
21ic.com screenshot

Report Summary

  • 49

    Performance

    Renders faster than
    67% of other websites

  • 86

    Accessibility

    Visual factors better than
    that of 61% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 100

    SEO

    Google-friendlier than
    94% of websites

21ic.com

21IC电子网 - 电子工程师的优选网站

Page Load Speed

13.3 sec in total

First Response

683 ms

Resources Loaded

11.9 sec

Page Rendered

723 ms

21ic.com screenshot

About Website

Click here to check amazing 21 Ic content for China. Otherwise, check out these important facts you probably never knew about 21ic.com

21IC电子网，电子工程师的优选网站(嵌入式,单片机,DSP,EDA,测试测量,元器件,医疗电子,智能电网)

Visit 21ic.com

Key Findings

We analyzed 21ic.com page load time and found that the first response time was 683 ms and then it took 12.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 90% of websites can load faster.

Performance Metrics

21ic.com performance score

49

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.6 s

2/100

10%

LCP (Largest Contentful Paint)

Value7.2 s

5/100

25%

SI (Speed Index)

Value12.0 s

4/100

10%

TBT (Total Blocking Time)

Value150 ms

94/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value8.6 s

37/100

10%

Network Requests Diagram

21ic.com

683 ms

www.21ic.com

1423 ms

2017global2_min.css

229 ms

2017home1_min.css

682 ms

index_nav2_min.css

911 ms

Our browser made a total of 295 requests to load all elements on the main page. We found that 28% of them (82 requests) were addressed to the original 21ic.com, 12% (35 requests) were made to Misc.21ic.com and 8% (25 requests) were made to Eclick.baidu.com. The less responsive or slowest element that took the longest time to load (5.9 sec) relates to the external source Edu.21ic.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 946.0 kB (20%)

Content Size

4.7 MB

After Optimization

3.8 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of 21ic.com main page is 4.7 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. 75% 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 3.7 MB which makes up the majority of the site volume.

HTML Optimization

-85%

Potential reduce by 277.5 kB

  • Original 325.3 kB
  • After minification 254.5 kB
  • After compression 47.9 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 70.8 kB, which is 22% 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 277.5 kB or 85% of the original size.

Image Optimization

-6%

Potential reduce by 231.3 kB

  • Original 3.7 MB
  • After minification 3.4 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. 21 Ic images are well optimized though.

JavaScript Optimization

-47%

Potential reduce by 222.1 kB

  • Original 477.2 kB
  • After minification 465.0 kB
  • After compression 255.1 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 222.1 kB or 47% of the original size.

CSS Optimization

-89%

Potential reduce by 215.2 kB

  • Original 242.4 kB
  • After minification 193.6 kB
  • After compression 27.2 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. 21ic.com needs all CSS files to be minified and compressed as it can save up to 215.2 kB or 89% of the original size.

Requests Breakdown

Number of requests can be reduced by 114 (39%)

Requests Now

293

After Optimization

179

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 293 CSS, Javascripts, AJAX and image requests in order to completely render the main page of 21 Ic. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 55 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

21ic.com

21ic.com

683 ms

www.21ic.com

www.21ic.com

1423 ms

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229 ms

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se.jpg

217 ms

se.jpg

se.jpg

212 ms

se.jpg

se.jpg

279 ms

ST_icon5.jpg

ST_icon5.jpg

231 ms

Accessibility Review

21ic.com accessibility score

86

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.

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

Links do not have a discernible name

Best Practices

21ic.com best practices score

83

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

SEO Factors

21ic.com SEO score

100

Search Engine Optimization Advices

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 21ic.com 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 21ic.com 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

21ic.com

Open Graph description is not detected on the main page of 21 Ic. 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: