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ins.sjtu.edu.cn screenshot

Report Summary

  • 26

    Performance

    Renders faster than
    46% of other websites

  • 79

    Accessibility

    Visual factors better than
    that of 48% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    81% of websites

  • 59

    SEO

    Google-friendlier than
    22% of websites

ins.sjtu.edu.cn

Page Load Speed

6.5 sec in total

First Response

1.2 sec

Resources Loaded

5.1 sec

Page Rendered

244 ms

ins.sjtu.edu.cn screenshot

About Website

Welcome to ins.sjtu.edu.cn homepage info - get ready to check Ins Sjtu best content for China right away, or after learning these important things about ins.sjtu.edu.cn

Visit ins.sjtu.edu.cn

Key Findings

We analyzed Ins.sjtu.edu.cn page load time and found that the first response time was 1.2 sec and then it took 5.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

ins.sjtu.edu.cn performance score

26

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.4 s

6/100

10%

LCP (Largest Contentful Paint)

Value13.0 s

0/100

25%

SI (Speed Index)

Value18.5 s

0/100

10%

TBT (Total Blocking Time)

Value490 ms

59/100

30%

CLS (Cumulative Layout Shift)

Value0.319

36/100

15%

TTI (Time to Interactive)

Value10.1 s

26/100

10%

Network Requests Diagram

ins.sjtu.edu.cn

1197 ms

application-40fd648301e09aed1a0c7f26f434dea8.css

1723 ms

application-6b3b47fe5c1f8fd57344af8f6060214f.js

2089 ms

logo.png

1154 ms

loading.gif

290 ms

Our browser made a total of 15 requests to load all elements on the main page. We found that 87% of them (13 requests) were addressed to the original Ins.sjtu.edu.cn, 13% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (2.1 sec) belongs to the original domain Ins.sjtu.edu.cn.

Page Optimization Overview & Recommendations

Page size can be reduced by 148.4 kB (16%)

Content Size

920.9 kB

After Optimization

772.5 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Ins.sjtu.edu.cn main page is 920.9 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. Images take 762.0 kB which makes up the majority of the site volume.

HTML Optimization

-74%

Potential reduce by 15.8 kB

  • Original 21.3 kB
  • After minification 20.7 kB
  • After compression 5.6 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 15.8 kB or 74% of the original size.

Image Optimization

-4%

Potential reduce by 32.0 kB

  • Original 762.0 kB
  • After minification 730.1 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. Ins Sjtu images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 34 B

  • Original 17.2 kB
  • After minification 17.2 kB
  • After compression 17.1 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. This website has mostly compressed JavaScripts.

CSS Optimization

-84%

Potential reduce by 100.6 kB

  • Original 120.4 kB
  • After minification 119.5 kB
  • After compression 19.8 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. Ins.sjtu.edu.cn needs all CSS files to be minified and compressed as it can save up to 100.6 kB or 84% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

14

After Optimization

14

  • Images
  • JavaScript
  • CSS

The browser has sent 14 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Ins Sjtu. According to our analytics all requests are already optimized.

Network Requests Diagram

ins.sjtu.edu.cn

ins.sjtu.edu.cn

1197 ms

application-40fd648301e09aed1a0c7f26f434dea8.css

application-40fd648301e09aed1a0c7f26f434dea8.css

1723 ms

application-6b3b47fe5c1f8fd57344af8f6060214f.js

application-6b3b47fe5c1f8fd57344af8f6060214f.js

2089 ms

logo.png

logo.png

1154 ms

loading.gif

loading.gif

290 ms

intr4.jpg

intr4.jpg

582 ms

intr2.jpg

intr2.jpg

1151 ms

intr3.jpg

intr3.jpg

1736 ms

intr5.jpg

intr5.jpg

1734 ms

intr6.jpg

intr6.jpg

1737 ms

intr1.jpg

intr1.jpg

871 ms

ga.js

ga.js

18 ms

__utm.gif

__utm.gif

11 ms

arrows.png

arrows.png

287 ms

bullets.png

bullets.png

288 ms

Accessibility Review

ins.sjtu.edu.cn accessibility score

79

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

[aria-hidden="true"] elements contain focusable descendents

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.

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

Document doesn't have a <title> element

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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

ins.sjtu.edu.cn best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

ins.sjtu.edu.cn SEO score

59

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Document doesn't have a <title> element

High

Links do not have descriptive text

High

Image elements do not have [alt] attributes

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

robots.txt is not valid

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

    N/A

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Ins.sjtu.edu.cn can be misinterpreted by Google and other search engines. Unfortunately we cannot identify language used on the page (probably there is a mix of languages, too little text or something else) and no language is claimed in <html> or <meta> tags either. Our system also found out that Ins.sjtu.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

ins.sjtu.edu.cn

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