Tools & Wizards About Us
coremail.cn screenshot

Report Summary

  • 32

    Performance

    Renders faster than
    52% of other websites

  • 47

    Accessibility

    Visual factors better than
    that of 20% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 82

    SEO

    Google-friendlier than
    44% of websites

coremail.cn

Coremail邮件系统-企业邮箱-邮件网关-10亿用户信赖的邮件服务器系统

Page Load Speed

14.8 sec in total

First Response

679 ms

Resources Loaded

13.2 sec

Page Rendered

891 ms

coremail.cn screenshot

About Website

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

Coremail专注电子邮件技术及服务25年,产品涵盖邮件系统,企业邮箱,邮件网关等。Coremail邮件系统性能稳定高效,是众多知名企业及政府高校搭建邮件服务器系统及企业邮箱的首选方案。

Visit coremail.cn

Key Findings

We analyzed Coremail.cn page load time and found that the first response time was 679 ms and then it took 14.1 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

coremail.cn performance score

32

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.7 s

5/100

10%

LCP (Largest Contentful Paint)

Value13.0 s

0/100

25%

SI (Speed Index)

Value19.1 s

0/100

10%

TBT (Total Blocking Time)

Value560 ms

52/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value15.6 s

6/100

10%

Network Requests Diagram

coremail.cn

679 ms

www.coremail.cn

793 ms

www.coremail.cn

1298 ms

swiper.min.css

217 ms

style.css

431 ms

Our browser made a total of 147 requests to load all elements on the main page. We found that 97% of them (143 requests) were addressed to the original Coremail.cn, 1% (2 requests) were made to Hm.baidu.com and 1% (1 request) were made to Goutong.baidu.com. The less responsive or slowest element that took the longest time to load (4.1 sec) belongs to the original domain Coremail.cn.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.4 MB (10%)

Content Size

13.8 MB

After Optimization

12.4 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Coremail.cn main page is 13.8 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. 65% of websites need less resources to load. Images take 13.1 MB which makes up the majority of the site volume.

HTML Optimization

-85%

Potential reduce by 71.2 kB

  • Original 83.9 kB
  • After minification 61.6 kB
  • After compression 12.7 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. This page needs HTML code to be minified as it can gain 22.3 kB, which is 27% 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 71.2 kB or 85% of the original size.

Image Optimization

-9%

Potential reduce by 1.2 MB

  • Original 13.1 MB
  • After minification 11.9 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. Coremail images are well optimized though.

JavaScript Optimization

-19%

Potential reduce by 103.6 kB

  • Original 546.0 kB
  • After minification 546.0 kB
  • After compression 442.4 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 103.6 kB or 19% of the original size.

CSS Optimization

-31%

Potential reduce by 9.3 kB

  • Original 29.9 kB
  • After minification 29.9 kB
  • After compression 20.6 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. Coremail.cn needs all CSS files to be minified and compressed as it can save up to 9.3 kB or 31% of the original size.

Requests Breakdown

Number of requests can be reduced by 20 (14%)

Requests Now

143

After Optimization

123

  • Images
  • JavaScript
  • CSS

The browser has sent 143 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Coremail. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 18 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

coremail.cn

coremail.cn

679 ms

www.coremail.cn

www.coremail.cn

793 ms

www.coremail.cn

www.coremail.cn

1298 ms

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swiper.min.css

217 ms

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431 ms

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jquery.mCustomScrollbar.min.css

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846 ms

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1630 ms

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1373 ms

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1437 ms

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1478 ms

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3288 ms

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3501 ms

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3939 ms

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1435 ms

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1476 ms

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1554 ms

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1595 ms

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1544 ms

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1622 ms

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1622 ms

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1668 ms

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1799 ms

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1691 ms

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1711 ms

Accessibility Review

coremail.cn accessibility score

47

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

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

coremail.cn best practices score

58

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

Serves images with low resolution

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

coremail.cn SEO score

82

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 uses legible font sizes

High

Tap targets are not sized appropriately

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 Coremail.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 Coremail.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

coremail.cn

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