Tools & Wizards About Us
openglbook.com screenshot

Report Summary

  • 91

    Performance

    Renders faster than
    91% of other websites

  • 89

    Accessibility

    Visual factors better than
    that of 72% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 92

    SEO

    Google-friendlier than
    75% of websites

openglbook.com

OpenGLBook.com | A Free OpenGL Programming Book

Page Load Speed

671 ms in total

First Response

142 ms

Resources Loaded

403 ms

Page Rendered

126 ms

openglbook.com screenshot

About Website

Visit openglbook.com now to see the best up-to-date OpenGL Book content for India and also check out these interesting facts you probably never knew about openglbook.com

Visit openglbook.com

Key Findings

We analyzed Openglbook.com page load time and found that the first response time was 142 ms and then it took 529 ms to load all DOM resources and completely render a web page. This is an excellent result, as only 5% of websites can load faster.

Performance Metrics

openglbook.com performance score

91

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.2 s

77/100

10%

LCP (Largest Contentful Paint)

Value2.3 s

93/100

25%

SI (Speed Index)

Value2.2 s

99/100

10%

TBT (Total Blocking Time)

Value230 ms

87/100

30%

CLS (Cumulative Layout Shift)

Value0.001

100/100

15%

TTI (Time to Interactive)

Value3.4 s

93/100

10%

Network Requests Diagram

openglbook.com

142 ms

syntax.css

20 ms

main.css

21 ms

jquery-2.1.0.min.js

4 ms

jsglhl.js

40 ms

Our browser made a total of 12 requests to load all elements on the main page. We found that 42% of them (5 requests) were addressed to the original Openglbook.com, 17% (2 requests) were made to Cdn.mathjax.org and 17% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (177 ms) relates to the external source Camo.githubusercontent.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 223.8 kB (67%)

Content Size

335.8 kB

After Optimization

112.0 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Openglbook.com main page is 335.8 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. 25% of websites need less resources to load. Javascripts take 293.9 kB which makes up the majority of the site volume.

HTML Optimization

-76%

Potential reduce by 13.4 kB

  • Original 17.7 kB
  • After minification 15.7 kB
  • After compression 4.3 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 2.0 kB, which is 11% 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 13.4 kB or 76% of the original size.

Image Optimization

-2%

Potential reduce by 274 B

  • Original 15.7 kB
  • After minification 15.4 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. OpenGL Book images are well optimized though.

JavaScript Optimization

-69%

Potential reduce by 203.1 kB

  • Original 293.9 kB
  • After minification 293.9 kB
  • After compression 90.7 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 203.1 kB or 69% of the original size.

CSS Optimization

-83%

Potential reduce by 7.1 kB

  • Original 8.5 kB
  • After minification 5.0 kB
  • After compression 1.5 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. Openglbook.com needs all CSS files to be minified and compressed as it can save up to 7.1 kB or 83% of the original size.

Requests Breakdown

Number of requests can be reduced by 4 (36%)

Requests Now

11

After Optimization

7

  • Images
  • JavaScript
  • CSS

The browser has sent 11 CSS, Javascripts, AJAX and image requests in order to completely render the main page of OpenGL Book. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

openglbook.com

openglbook.com

142 ms

syntax.css

syntax.css

20 ms

main.css

main.css

21 ms

jquery-2.1.0.min.js

jquery-2.1.0.min.js

4 ms

jsglhl.js

jsglhl.js

40 ms

MathJax.js

MathJax.js

18 ms

TeX-AMS-MML_HTMLorMML.js

TeX-AMS-MML_HTMLorMML.js

32 ms

68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f7265645f6161303030302e706e67

68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f7265645f6161303030302e706e67

177 ms

analytics.js

analytics.js

92 ms

ogl.jpg

ogl.jpg

82 ms

88x31.png

88x31.png

127 ms

collect

collect

19 ms

Accessibility Review

openglbook.com accessibility score

89

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

Best Practices

openglbook.com 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

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

openglbook.com SEO score

92

Search Engine Optimization Advices

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

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Openglbook.com can be misinterpreted by Google and other search engines. Our service has detected that English 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 Openglbook.com 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

openglbook.com

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