Tools & Wizards About Us

Report Summary

  • 16

    Performance

    Renders faster than
    30% of other websites

  • 69

    Accessibility

    Visual factors better than
    that of 34% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 83

    SEO

    Google-friendlier than
    46% of websites

zdns.cn

互联网域名系统国家工程研究中心（ZDNS） ——领先的互联网关键基础资源领域服务商

Page Load Speed

8.6 sec in total

First Response

1.2 sec

Resources Loaded

7.2 sec

Page Rendered

139 ms

About Website

Click here to check amazing ZDNS content for China. Otherwise, check out these important facts you probably never knew about zdns.cn

ZDNS专注于全局负载均衡(GSLB)、智能DNS、新通用顶级域名、顶级域名申请、顶级域名运营、HTTPDNS、DDI、DNS云解析,DNS云托管、顶级域名等服务领域，提供申请顶级域名、新通用顶级域名、HTTPDNS、DDI、智能DNS、DNS云托管、DNS云解析等方向整体解决方案，互联网域名系统北京市工程研究中心为国内专业的顶级域名管家和备案管家。

Visit zdns.cn

Key Findings

We analyzed Zdns.cn page load time and found that the first response time was 1.2 sec and then it took 7.3 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

zdns.cn performance score

16

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.4 s

6/100

10%

LCP (Largest Contentful Paint)

Value18.6 s

0/100

25%

SI (Speed Index)

Value13.9 s

1/100

10%

TBT (Total Blocking Time)

Value4,100 ms

1/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value22.8 s

1/100

10%

Network Requests Diagram

zdns.cn

1224 ms

jQuery.js

1173 ms

imgsPlayer.js

465 ms

scroll.js

717 ms

main.js

479 ms

Our browser made a total of 36 requests to load all elements on the main page. We found that 89% of them (32 requests) were addressed to the original Zdns.cn, 6% (2 requests) were made to Ss.knet.cn and 6% (2 requests) were made to Hm.baidu.com. The less responsive or slowest element that took the longest time to load (5.2 sec) belongs to the original domain Zdns.cn.

Page Optimization Overview & Recommendations

Page size can be reduced by 308.4 kB (16%)

Content Size

2.0 MB

After Optimization

1.7 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Zdns.cn main page is 2.0 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. 20% of websites need less resources to load. Images take 1.8 MB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 24.2 kB

  • Original 31.4 kB
  • After minification 27.0 kB
  • After compression 7.3 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 4.5 kB, which is 14% 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 24.2 kB or 77% of the original size.

Image Optimization

-11%

Potential reduce by 203.8 kB

  • Original 1.8 MB
  • After minification 1.6 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, ZDNS needs image optimization as it can save up to 203.8 kB 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

-66%

Potential reduce by 54.6 kB

  • Original 82.2 kB
  • After minification 79.0 kB
  • After compression 27.6 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 54.6 kB or 66% of the original size.

CSS Optimization

-82%

Potential reduce by 25.8 kB

  • Original 31.3 kB
  • After minification 26.4 kB
  • After compression 5.6 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. Zdns.cn needs all CSS files to be minified and compressed as it can save up to 25.8 kB or 82% of the original size.

Requests Breakdown

Number of requests can be reduced by 5 (15%)

Requests Now

33

After Optimization

28

  • Images
  • JavaScript
  • CSS

The browser has sent 33 CSS, Javascripts, AJAX and image requests in order to completely render the main page of ZDNS. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 6 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

zdns.cn accessibility score

69

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

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

zdns.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

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

zdns.cn SEO score

83

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 Zdns.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 Zdns.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 ZDNS. 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: