Tools & Wizards About Us

Report Summary

  • 66

    Performance

    Renders faster than
    79% of other websites

  • 75

    Accessibility

    Visual factors better than
    that of 41% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 90

    SEO

    Google-friendlier than
    68% of websites

osgchina.org

osg（osg中文社区）-osgEarth-osgViewer-基于OpenGL-开源三维渲染引擎-图形引擎-虚拟仿真工具-osg教程-osg仿真

Page Load Speed

9.3 sec in total

First Response

698 ms

Resources Loaded

8.2 sec

Page Rendered

429 ms

About Website

Visit osgchina.org now to see the best up-to-date Osg China content for China and also check out these interesting facts you probably never knew about osgchina.org

osg全称OpenSceneGraph，是一个以OpenGL为基础的开源三维渲染引擎，在osgEarth、粒子系统、图形渲染、三维可视化方面应用成熟。其开放了osg论坛、osg社区、osg教程、osg源代码、三维虚拟仿真工具等内容，欢迎学习。

Visit osgchina.org

Key Findings

We analyzed Osgchina.org page load time and found that the first response time was 698 ms and then it took 8.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 85% of websites can load faster.

Performance Metrics

osgchina.org performance score

66

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.5 s

69/100

10%

LCP (Largest Contentful Paint)

Value5.5 s

19/100

25%

SI (Speed Index)

Value8.3 s

19/100

10%

TBT (Total Blocking Time)

Value90 ms

99/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value4.6 s

81/100

10%

Network Requests Diagram

osgchina.org

698 ms

common.css

219 ms

bootstrap.min.css

597 ms

font-awesome.min.css

407 ms

jquery2.2.2.min.js

611 ms

Our browser made a total of 68 requests to load all elements on the main page. We found that 97% of them (66 requests) were addressed to the original Osgchina.org, 3% (2 requests) were made to Hm.baidu.com. The less responsive or slowest element that took the longest time to load (6.4 sec) belongs to the original domain Osgchina.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 395.6 kB (9%)

Content Size

4.4 MB

After Optimization

4.0 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Osgchina.org main page is 4.4 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. 70% of websites need less resources to load. Images take 4.1 MB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 45.0 kB

  • Original 56.6 kB
  • After minification 45.9 kB
  • After compression 11.6 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. This page needs HTML code to be minified as it can gain 10.7 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 45.0 kB or 80% of the original size.

Image Optimization

-6%

Potential reduce by 260.2 kB

  • Original 4.1 MB
  • After minification 3.8 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. Osg China images are well optimized though.

JavaScript Optimization

-12%

Potential reduce by 15.6 kB

  • Original 126.2 kB
  • After minification 126.0 kB
  • After compression 110.6 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 15.6 kB or 12% of the original size.

CSS Optimization

-63%

Potential reduce by 74.8 kB

  • Original 117.9 kB
  • After minification 103.7 kB
  • After compression 43.1 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. Osgchina.org needs all CSS files to be minified and compressed as it can save up to 74.8 kB or 63% of the original size.

Requests Breakdown

Number of requests can be reduced by 14 (21%)

Requests Now

67

After Optimization

53

  • Images
  • JavaScript
  • CSS

The browser has sent 67 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Osg China. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 9 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

osgchina.org accessibility score

75

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.

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

<dl>'s do not contain only properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements.

High

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

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

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

osgchina.org best practices score

83

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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

osgchina.org SEO score

90

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

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

    ZH

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Osgchina.org can be misinterpreted by Google and other search engines. Our service has detected that Chinese is used on the page, and it matches the claimed language. Our system also found out that Osgchina.org 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 Osg China. 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: