Tools & Wizards About Us
xao.ac.cn screenshot

Report Summary

  • 94

    Performance

    Renders faster than
    93% of other websites

  • 47

    Accessibility

    Visual factors better than
    that of 20% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 58

    SEO

    Google-friendlier than
    20% of websites

xao.ac.cn

中国科学院新疆天文台

Page Load Speed

5.3 sec in total

First Response

1.6 sec

Resources Loaded

3.6 sec

Page Rendered

203 ms

xao.ac.cn screenshot

About Website

Click here to check amazing Xao content for China. Otherwise, check out these important facts you probably never knew about xao.ac.cn

中国科学院新疆天文台成立于1957年，由单一的人造卫星观测站发展成为我国西部重要的综合性天文研究机构。目前研究领域包括射电天文、光学天文与技术应用、应用天文，主要从事脉冲星、恒星形成与演化、星系宇宙学、高能天体物理、微波接收机、数字技术应用、空间目标与碎片、卫星导航、GPS等方面的研究与观测。

Visit xao.ac.cn

Key Findings

We analyzed Xao.ac.cn page load time and found that the first response time was 1.6 sec and then it took 3.8 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

xao.ac.cn performance score

94

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.0 s

100/100

10%

LCP (Largest Contentful Paint)

Value2.8 s

83/100

25%

SI (Speed Index)

Value3.5 s

89/100

10%

TBT (Total Blocking Time)

Value120 ms

97/100

30%

CLS (Cumulative Layout Shift)

Value0.001

100/100

15%

TTI (Time to Interactive)

Value1.6 s

100/100

10%

Network Requests Diagram

xao.ac.cn

1555 ms

xjtwtcss.css

787 ms

wbtrk2.js

245 ms

cn75bg.jpg

265 ms

xjtwtbanner.jpg

894 ms

Our browser made a total of 38 requests to load all elements on the main page. We found that 97% of them (37 requests) were addressed to the original Xao.ac.cn, 3% (1 request) were made to Tracker2.cas.cn. The less responsive or slowest element that took the longest time to load (1.9 sec) belongs to the original domain Xao.ac.cn.

Page Optimization Overview & Recommendations

Page size can be reduced by 148.3 kB (37%)

Content Size

401.3 kB

After Optimization

253.0 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Xao.ac.cn main page is 401.3 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 258.0 kB which makes up the majority of the site volume.

HTML Optimization

-84%

Potential reduce by 72.8 kB

  • Original 86.7 kB
  • After minification 70.3 kB
  • After compression 14.0 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 16.4 kB, which is 19% 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 72.8 kB or 84% of the original size.

Image Optimization

-13%

Potential reduce by 33.3 kB

  • Original 258.0 kB
  • After minification 224.6 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, Xao needs image optimization as it can save up to 33.3 kB or 13% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-68%

Potential reduce by 21.3 kB

  • Original 31.5 kB
  • After minification 26.8 kB
  • After compression 10.2 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 21.3 kB or 68% of the original size.

CSS Optimization

-83%

Potential reduce by 20.9 kB

  • Original 25.1 kB
  • After minification 21.3 kB
  • After compression 4.2 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. Xao.ac.cn needs all CSS files to be minified and compressed as it can save up to 20.9 kB or 83% of the original size.

Requests Breakdown

Number of requests can be reduced by 6 (35%)

Requests Now

17

After Optimization

11

  • Images
  • JavaScript
  • CSS

The browser has sent 17 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Xao. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests and as a result speed up the page load time.

Network Requests Diagram

xao.ac.cn

xao.ac.cn

1555 ms

xjtwtcss.css

xjtwtcss.css

787 ms

wbtrk2.js

wbtrk2.js

245 ms

cn75bg.jpg

cn75bg.jpg

265 ms

xjtwtbanner.jpg

xjtwtbanner.jpg

894 ms

menu_bg.gif

menu_bg.gif

483 ms

enc8_sesrch.gif

enc8_sesrch.gif

505 ms

cn75middle03.gif

cn75middle03.gif

514 ms

cn75icon01.jpg

cn75icon01.jpg

525 ms

cn75middle15.gif

cn75middle15.gif

534 ms

cn75middle07.gif

cn75middle07.gif

724 ms

dqlx.jpg

dqlx.jpg

756 ms

cn75bottom02.png

cn75bottom02.png

1280 ms

cn75bottom03.gif

cn75bottom03.gif

783 ms

1-0.gif

1-0.gif

780 ms

1-1.gif

1-1.gif

947 ms

2-0.gif

2-0.gif

991 ms

2-1.gif

2-1.gif

1030 ms

3-0.gif

3-0.gif

1044 ms

3-1.gif

3-1.gif

1116 ms

4-0.gif

4-0.gif

1186 ms

4-1.gif

4-1.gif

1241 ms

5-0.gif

5-0.gif

1289 ms

5-1.gif

5-1.gif

1307 ms

6-0.gif

6-0.gif

1356 ms

6-1.gif

6-1.gif

1427 ms

7-0.gif

7-0.gif

1492 ms

7-1.gif

7-1.gif

1517 ms

8-0.gif

8-0.gif

1550 ms

8-1.gif

8-1.gif

1572 ms

webmail_bgline.gif

webmail_bgline.gif

1592 ms

webmail_bg.jpg

webmail_bg.jpg

1898 ms

cn75middle01.gif

cn75middle01.gif

1723 ms

cn75middle02.jpg

cn75middle02.jpg

1754 ms

cn75middle14.jpg

cn75middle14.jpg

1788 ms

cn75middle17.jpg

cn75middle17.jpg

1815 ms

cnb7_xx01.gif

cnb7_xx01.gif

1817 ms

__wbtrk.gif

__wbtrk.gif

782 ms

Accessibility Review

xao.ac.cn accessibility score

47

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

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

<input type="image"> elements do not have [alt] text

High

Form elements do not have associated labels

High

Links do not have a discernible name

Best Practices

xao.ac.cn best practices score

67

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

High

Browser errors were logged to the console

SEO Factors

xao.ac.cn SEO score

58

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

Image elements do not have [alt] attributes

High

Document uses plugins

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 Xao.ac.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 Xao.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

xao.ac.cn

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