Access unep-iesd.tongji.edu.cn. 同济大学环境与可持续发展学院

name

value

score

weighting

FCP (First Contentful Paint)

Value3.7 s

30/100

10%

LCP (Largest Contentful Paint)

Value10.3 s

0/100

25%

SI (Speed Index)

Value22.2 s

0/100

10%

TBT (Total Blocking Time)

Value30 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value1.451

0/100

15%

TTI (Time to Interactive)

Value26.5 s

0/100

10%

unep-iesd.tongji.edu.cn

1446 ms

main.htm

409 ms

system.css

398 ms

system.css

574 ms

sudyNav.css

574 ms

Our browser made a total of 83 requests to load all elements on the main page. We found that all of those requests were addressed to Unep-iesd.tongji.edu.cn and no external sources were called. The less responsive or slowest element that took the longest time to load (4.9 sec) belongs to the original domain Unep-iesd.tongji.edu.cn.

Content Size

28.4 MB

After Optimization

26.7 MB

In fact, the total size of Unep-iesd.tongji.edu.cn main page is 28.4 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. 35% of websites need less resources to load. Images take 28.1 MB which makes up the majority of the site volume.

HTML Optimization

-84%

Potential reduce by 55.0 kB

Original 65.2 kB
After minification 38.7 kB
After compression 10.2 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 26.5 kB, which is 41% 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 55.0 kB or 84% of the original size.

Image Optimization

-5%

Potential reduce by 1.5 MB

Original 28.1 MB
After minification 26.6 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. Unep Iesd Tongji images are well optimized though.

JavaScript Optimization

-56%

Potential reduce by 90.9 kB

Original 161.7 kB
After minification 156.9 kB
After compression 70.8 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 90.9 kB or 56% of the original size.

CSS Optimization

-34%

Potential reduce by 9.7 kB

Original 28.8 kB
After minification 28.2 kB
After compression 19.1 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. Unep-iesd.tongji.edu.cn needs all CSS files to be minified and compressed as it can save up to 9.7 kB or 34% of the original size.

Requests Now

After Optimization

The browser has sent 79 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Unep Iesd Tongji. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 10 to 1 for JavaScripts and from 12 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

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.

High

Buttons do not have an accessible name

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

These are opportunities to improve keyboard navigation in your application.

High

Heading elements are not in a sequentially-descending order

These are opportunities to improve the interpretation of your content by users in different locales.

High

<html> element does not have a [lang] attribute

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

High

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

These items highlight common accessibility best practices.

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

High

Displays images with incorrect aspect ratio

Low

Detected JavaScript libraries

High

Page has valid source maps

Search Engine Optimization Advices

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

High

Links are not crawlable

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

High

Image elements do not have [alt] attributes

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/).

High

Document uses legible font sizes

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 Unep-iesd.tongji.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 Unep-iesd.tongji.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

unep-iesd.tongji.edu.cn

Open Graph description is not detected on the main page of Unep Iesd Tongji. 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:

Report Summary

Performance

Accessibility

Best Practices

SEO

同济大学环境与可持续发展学院

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

unep-iesd.tongji.edu.cn

main.htm

system.css

system.css

sudyNav.css

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

unep-iesd.tongji.edu.cn

main.htm

system.css

system.css

sudyNav.css

datepicker.css

simplenews.css

default.css

jquery.min.js

jquery.sudy.wp.visitcount.js

jquery.sudyNav.js

jquery.datepicker.js

datepicker_lang_HK.js

animate.css

swiper.min.css

animated-border.min.css

common.css

index.css

jquery.SuperSlide.2.1.3.js

swiper.min.js

toTop.js

index.js

bootstrap-dropdown-on-hover.js

system_editor.css

search.png

topbg.jpg

logo.png

en.png

mbg.png

erbg1.png

cd67108e-a2bb-4605-90ad-6c928e21256f.jpg

a09ce26c-adb4-4526-8c7c-3043c57893ad.png

ba4d6a3d-b158-4838-b3a9-4a2975b7b6a2.jpg

178e5740-0ac7-455a-81a7-7a219f8d7c57.jpg

994e50c5-a725-49bd-8aea-3462fbc634a3.jpg

4a30e229-57d9-4c37-8c70-2b1d1ae9a401.jpg

bdown.png

baa.png

btbg.png

bbg.jpg

3402defc-84af-47bb-a6e8-8b2e41b26703.jpg

1f24aeba-37ce-4734-b8a4-5389480b81f0.jpg

481ddf84-0365-4ef5-a21d-dc2d48ac5673.jpg