Tools & Wizards About Us

Report Summary

  • 46

    Performance

    Renders faster than
    65% of other websites

  • 44

    Accessibility

    Visual factors better than
    that of 19% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 81

    SEO

    Google-friendlier than
    43% of websites

zju-cos.com

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Page Load Speed

3.8 sec in total

First Response

497 ms

Resources Loaded

2.4 sec

Page Rendered

886 ms

About Website

Welcome to zju-cos.com homepage info - get ready to check Zju Cos best content right away, or after learning these important things about zju-cos.com

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Visit zju-cos.com

Key Findings

We analyzed Zju-cos.com page load time and found that the first response time was 497 ms and then it took 3.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.

Performance Metrics

zju-cos.com performance score

46

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.4 s

38/100

10%

LCP (Largest Contentful Paint)

Value5.7 s

16/100

25%

SI (Speed Index)

Value4.9 s

65/100

10%

TBT (Total Blocking Time)

Value850 ms

34/100

30%

CLS (Cumulative Layout Shift)

Value0.008

100/100

15%

TTI (Time to Interactive)

Value6.3 s

61/100

10%

Network Requests Diagram

www.zju-cos.com

497 ms

fennenav-font.css

128 ms

fennenav-ui.css

135 ms

fennenav-site.css

132 ms

fennenav-color.css

131 ms

Our browser made a total of 52 requests to load all elements on the main page. We found that 71% of them (37 requests) were addressed to the original Zju-cos.com, 6% (3 requests) were made to Imageoss.com and 4% (2 requests) were made to T.dtscout.com. The less responsive or slowest element that took the longest time to load (688 ms) relates to the external source Api.tongjiniao.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 190.4 kB (39%)

Content Size

484.6 kB

After Optimization

294.2 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Zju-cos.com main page is 484.6 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. 30% of websites need less resources to load. Javascripts take 253.2 kB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 129.2 kB

  • Original 165.7 kB
  • After minification 164.5 kB
  • After compression 36.5 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 129.2 kB or 78% of the original size.

Image Optimization

-75%

Potential reduce by 32.6 kB

  • Original 43.6 kB
  • After minification 11.0 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. Obviously, Zju Cos needs image optimization as it can save up to 32.6 kB or 75% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-10%

Potential reduce by 24.2 kB

  • Original 253.2 kB
  • After minification 253.2 kB
  • After compression 229.0 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. This website has mostly compressed JavaScripts.

CSS Optimization

-20%

Potential reduce by 4.4 kB

  • Original 22.1 kB
  • After minification 22.1 kB
  • After compression 17.7 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. Zju-cos.com needs all CSS files to be minified and compressed as it can save up to 4.4 kB or 20% of the original size.

Requests Breakdown

Number of requests can be reduced by 24 (51%)

Requests Now

47

After Optimization

23

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 47 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Zju Cos. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 21 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

zju-cos.com accessibility score

44

Accessibility Issues

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

Buttons do not have an accessible name

High

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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

High

[lang] attributes do not have a valid value

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

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

zju-cos.com 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

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

SEO Factors

zju-cos.com SEO score

81

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 Zju-cos.com 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 Zju-cos.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

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