Tools & Wizards About Us
mail.pku.edu.cn screenshot

Report Summary

  • 23

    Performance

    Renders faster than
    42% of other websites

  • 67

    Accessibility

    Visual factors better than
    that of 32% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 91

    SEO

    Google-friendlier than
    71% of websites

mail.pku.edu.cn

北京大学邮件系统 Peking University WebMail

Page Load Speed

10.3 sec in total

First Response

3.7 sec

Resources Loaded

6.5 sec

Page Rendered

102 ms

mail.pku.edu.cn screenshot

About Website

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

Visit mail.pku.edu.cn

Key Findings

We analyzed Mail.pku.edu.cn page load time and found that the first response time was 3.7 sec and then it took 6.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 80% of websites can load faster.

Performance Metrics

mail.pku.edu.cn performance score

23

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.3 s

39/100

10%

LCP (Largest Contentful Paint)

Value13.4 s

0/100

25%

SI (Speed Index)

Value13.4 s

2/100

10%

TBT (Total Blocking Time)

Value1,820 ms

9/100

30%

CLS (Cumulative Layout Shift)

Value0.004

100/100

15%

TTI (Time to Interactive)

Value12.6 s

14/100

10%

Network Requests Diagram

mail.pku.edu.cn

3652 ms

login.css

463 ms

custom.css

473 ms

jquery-1.8.2.min.js

1640 ms

jquery-1.8.2.min.js

1167 ms

Our browser made a total of 15 requests to load all elements on the main page. We found that all of those requests were addressed to Mail.pku.edu.cn and no external sources were called. The less responsive or slowest element that took the longest time to load (3.7 sec) belongs to the original domain Mail.pku.edu.cn.

Page Optimization Overview & Recommendations

Page size can be reduced by 297.5 kB (49%)

Content Size

612.1 kB

After Optimization

314.6 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Mail.pku.edu.cn main page is 612.1 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. Only 10% of websites need less resources to load. Javascripts take 404.5 kB which makes up the majority of the site volume.

HTML Optimization

-70%

Potential reduce by 5.1 kB

  • Original 7.3 kB
  • After minification 6.1 kB
  • After compression 2.2 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 1.3 kB, which is 17% 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 5.1 kB or 70% of the original size.

Image Optimization

-1%

Potential reduce by 2.7 kB

  • Original 188.2 kB
  • After minification 185.5 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. Mail Pku images are well optimized though.

JavaScript Optimization

-69%

Potential reduce by 280.4 kB

  • Original 404.5 kB
  • After minification 402.3 kB
  • After compression 124.1 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 280.4 kB or 69% of the original size.

CSS Optimization

-77%

Potential reduce by 9.2 kB

  • Original 12.0 kB
  • After minification 9.8 kB
  • After compression 2.8 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.pku.edu.cn needs all CSS files to be minified and compressed as it can save up to 9.2 kB or 77% of the original size.

Requests Breakdown

Number of requests can be reduced by 4 (29%)

Requests Now

14

After Optimization

10

  • Images
  • JavaScript
  • CSS

The browser has sent 14 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Mail Pku. 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 as a result speed up the page load time.

Network Requests Diagram

mail.pku.edu.cn

mail.pku.edu.cn

3652 ms

login.css

login.css

463 ms

custom.css

custom.css

473 ms

jquery-1.8.2.min.js

jquery-1.8.2.min.js

1640 ms

jquery-1.8.2.min.js

jquery-1.8.2.min.js

1167 ms

jquery-ui.min.js

jquery-ui.min.js

2109 ms

login_0.js

login_0.js

1404 ms

blur.js

blur.js

1698 ms

bg_v1.jpg

bg_v1.jpg

471 ms

bg_v2.jpg

bg_v2.jpg

939 ms

bg_v3.jpg

bg_v3.jpg

250 ms

logo_mail.gif

logo_mail.gif

472 ms

p1.png

p1.png

237 ms

input.png

input.png

240 ms

bg.gif

bg.gif

475 ms

Accessibility Review

mail.pku.edu.cn accessibility score

67

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

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

mail.pku.edu.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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Uses deprecated APIs

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

mail.pku.edu.cn SEO score

91

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

    N/A

  • Encoding

    GBK

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Mail.pku.edu.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 Mail.pku.edu.cn main page’s claimed encoding is gbk. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

mail.pku.edu.cn

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