Tools & Wizards About Us
issibj.ac.cn screenshot

Report Summary

  • 45

    Performance

    Renders faster than
    64% of other websites

  • 83

    Accessibility

    Visual factors better than
    that of 54% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 75

    SEO

    Google-friendlier than
    32% of websites

issibj.ac.cn

International Space Science Institute - Beijing

Page Load Speed

12.2 sec in total

First Response

1.7 sec

Resources Loaded

9.6 sec

Page Rendered

939 ms

issibj.ac.cn screenshot

About Website

Visit issibj.ac.cn now to see the best up-to-date Issibj content and also check out these interesting facts you probably never knew about issibj.ac.cn

The International Space Science Institute in Beijing (ISSI-BJ) was jointly established by the National Space Science Center (NSSC) and the International Space Science Institute (ISSI) with the support...

Visit issibj.ac.cn

Key Findings

We analyzed Issibj.ac.cn page load time and found that the first response time was 1.7 sec and then it took 10.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 90% of websites can load faster.

Performance Metrics

issibj.ac.cn performance score

45

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.5 s

66/100

10%

LCP (Largest Contentful Paint)

Value13.2 s

0/100

25%

SI (Speed Index)

Value8.6 s

17/100

10%

TBT (Total Blocking Time)

Value180 ms

92/100

30%

CLS (Cumulative Layout Shift)

Value0.514

15/100

15%

TTI (Time to Interactive)

Value5.8 s

67/100

10%

Network Requests Diagram

issibj.ac.cn

1698 ms

animate.min.css

965 ms

bootstrap.css

1434 ms

font-awesome.min.css

1475 ms

animations.css

746 ms

Our browser made a total of 51 requests to load all elements on the main page. We found that 88% of them (45 requests) were addressed to the original Issibj.ac.cn, 4% (2 requests) were made to Api.cas.cn and 2% (1 request) were made to S9.cnzz.com. The less responsive or slowest element that took the longest time to load (6.5 sec) belongs to the original domain Issibj.ac.cn.

Page Optimization Overview & Recommendations

Page size can be reduced by 410.7 kB (17%)

Content Size

2.5 MB

After Optimization

2.1 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Issibj.ac.cn main page is 2.5 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 2.1 MB which makes up the majority of the site volume.

HTML Optimization

-89%

Potential reduce by 123.6 kB

  • Original 139.4 kB
  • After minification 106.5 kB
  • After compression 15.8 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 32.9 kB, which is 24% 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 123.6 kB or 89% of the original size.

Image Optimization

-10%

Potential reduce by 222.7 kB

  • Original 2.1 MB
  • After minification 1.9 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. Issibj images are well optimized though.

JavaScript Optimization

-27%

Potential reduce by 30.3 kB

  • Original 114.0 kB
  • After minification 104.5 kB
  • After compression 83.7 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 30.3 kB or 27% of the original size.

CSS Optimization

-33%

Potential reduce by 34.1 kB

  • Original 104.6 kB
  • After minification 104.6 kB
  • After compression 70.4 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. Issibj.ac.cn needs all CSS files to be minified and compressed as it can save up to 34.1 kB or 33% of the original size.

Requests Breakdown

Number of requests can be reduced by 16 (33%)

Requests Now

49

After Optimization

33

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 49 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Issibj. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 8 to 1 for JavaScripts and from 10 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

issibj.ac.cn

issibj.ac.cn

1698 ms

animate.min.css

animate.min.css

965 ms

bootstrap.css

bootstrap.css

1434 ms

font-awesome.min.css

font-awesome.min.css

1475 ms

animations.css

animations.css

746 ms

publicstyle.css

publicstyle.css

1467 ms

style.css

style.css

1500 ms

responsive.css

responsive.css

758 ms

jquery-1.12.4.min.js

jquery-1.12.4.min.js

1947 ms

slick.css

slick.css

472 ms

slick-theme.css

slick-theme.css

470 ms

fullcalendar.css

fullcalendar.css

469 ms

bootstrap.min.js

bootstrap.min.js

1024 ms

modernizr.js

modernizr.js

725 ms

template.js

template.js

965 ms

slick.min.js

slick.min.js

1195 ms

fullcalendar.min.js

fullcalendar.min.js

1430 ms

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4123 ms

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468 ms

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933 ms

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1165 ms

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5177 ms

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1917 ms

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1631 ms

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1400 ms

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3494 ms

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W020240704362655400799.png

1636 ms

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W020240701413712200813.jpg

2015 ms

bg01.png

bg01.png

720 ms

en-logo.png

en-logo.png

291 ms

en-logo-md.png

en-logo-md.png

299 ms

en-logo-sm.png

en-logo-sm.png

284 ms

en-logo-sm1.png

en-logo-sm1.png

493 ms

en-logo-xs.png

en-logo-xs.png

236 ms

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W020211129357952228614.png

6539 ms

footicon03_04.png

footicon03_04.png

2123 ms

enbg01.jpg

enbg01.jpg

537 ms

lanmu-bg01.png

lanmu-bg01.png

487 ms

event_time.png

event_time.png

501 ms

en-icon02.png

en-icon02.png

516 ms

enbg02.jpg

enbg02.jpg

1692 ms

footicon04.png

footicon04.png

721 ms

footicon01.png

footicon01.png

744 ms

footicon03.png

footicon03.png

764 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

738 ms

z_stat.php

z_stat.php

1357 ms

stat.htm

stat.htm

1688 ms

c.js

c.js

1594 ms

pic.gif

pic.gif

1238 ms

bg03.png

bg03.png

279 ms

bg02.png

bg02.png

243 ms

Accessibility Review

issibj.ac.cn accessibility score

83

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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>).

High

List items (<li>) are not contained within <ul> or <ol> parent elements.

Best Practices

issibj.ac.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

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

issibj.ac.cn SEO score

75

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

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

Links are not crawlable

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

    EN

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Issibj.ac.cn can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Issibj.ac.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

issibj.ac.cn

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