Tools & Wizards About Us

Report Summary

  • 23

    Performance

    Renders faster than
    41% of other websites

  • 85

    Accessibility

    Visual factors better than
    that of 58% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 58

    SEO

    Google-friendlier than
    21% of websites

mail.xjtu.edu.cn

Coremail System

Page Load Speed

5.2 sec in total

First Response

910 ms

Resources Loaded

4.2 sec

Page Rendered

67 ms

About Website

Welcome to mail.xjtu.edu.cn homepage info - get ready to check Mail Xjtu best content for China right away, or after learning these important things about mail.xjtu.edu.cn

Visit mail.xjtu.edu.cn

Key Findings

We analyzed Mail.xjtu.edu.cn page load time and found that the first response time was 910 ms and then it took 4.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.

Performance Metrics

mail.xjtu.edu.cn performance score

23

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.6 s

14/100

10%

LCP (Largest Contentful Paint)

Value9.1 s

1/100

25%

SI (Speed Index)

Value11.8 s

4/100

10%

TBT (Total Blocking Time)

Value1,650 ms

11/100

30%

CLS (Cumulative Layout Shift)

Value0.005

100/100

15%

TTI (Time to Interactive)

Value9.4 s

30/100

10%

Network Requests Diagram

mail.xjtu.edu.cn

910 ms

webmail.xjtu.edu.cn

1253 ms

iconfont.css

245 ms

custom.css

490 ms

custom.cdn.css

733 ms

Our browser made a total of 11 requests to load all elements on the main page. We found that 9% of them (1 request) were addressed to the original Mail.xjtu.edu.cn, 91% (10 requests) were made to Webmail.xjtu.edu.cn. The less responsive or slowest element that took the longest time to load (1.7 sec) relates to the external source Webmail.xjtu.edu.cn.

Page Optimization Overview & Recommendations

Page size can be reduced by 69.7 kB (17%)

Content Size

399.3 kB

After Optimization

329.6 kB

  • HTML
  • JavaScript
  • CSS

In fact, the total size of Mail.xjtu.edu.cn main page is 399.3 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 15% of websites need less resources to load. Javascripts take 349.5 kB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 14.6 kB

  • Original 18.8 kB
  • After minification 18.7 kB
  • After compression 4.2 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. 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 14.6 kB or 78% of the original size.

JavaScript Optimization

-11%

Potential reduce by 38.0 kB

  • Original 349.5 kB
  • After minification 349.5 kB
  • After compression 311.5 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 38.0 kB or 11% of the original size.

CSS Optimization

-55%

Potential reduce by 17.1 kB

  • Original 30.9 kB
  • After minification 28.6 kB
  • After compression 13.8 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. Mail.xjtu.edu.cn needs all CSS files to be minified and compressed as it can save up to 17.1 kB or 55% of the original size.

Requests Breakdown

Number of requests can be reduced by 7 (78%)

Requests Now

9

After Optimization

2

  • JavaScript
  • CSS

The browser has sent 9 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Mail Xjtu. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

mail.xjtu.edu.cn accessibility score

85

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

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Some elements have a [tabindex] value greater than 0

Best Practices

mail.xjtu.edu.cn best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

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

Missing source maps for large first-party JavaScript

SEO Factors

mail.xjtu.edu.cn SEO score

58

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

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Mail.xjtu.edu.cn can be misinterpreted by Google and other search engines. Our service has detected that English 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 Mail.xjtu.edu.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 Mail Xjtu. 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: