Report Summary

  • 91

    Performance

    Renders faster than
    91% of other websites

  • 63

    Accessibility

    Visual factors better than
    that of 28% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 83

    SEO

    Google-friendlier than
    46% of websites

Page Load Speed

2.3 sec in total

First Response

393 ms

Resources Loaded

1.7 sec

Page Rendered

204 ms

khanacedemy.org screenshot

About Website

Welcome to khanacedemy.org homepage info - get ready to check Khanacedemy best content right away, or after learning these important things about khanacedemy.org

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Key Findings

We analyzed Khanacedemy.org page load time and found that the first response time was 393 ms and then it took 1.9 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 35% of websites can load faster.

Performance Metrics

khanacedemy.org performance score

91

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.6 s

95/100

10%

LCP (Largest Contentful Paint)

Value1.6 s

99/100

25%

SI (Speed Index)

Value2.4 s

98/100

10%

TBT (Total Blocking Time)

Value150 ms

94/100

30%

CLS (Cumulative Layout Shift)

Value0.197

62/100

15%

TTI (Time to Interactive)

Value3.7 s

91/100

10%

Network Requests Diagram

ww38.khanacedemy.org

393 ms

caf.js

41 ms

style.css

79 ms

style.css

82 ms

js3caf.js

90 ms

Our browser made a total of 11 requests to load all elements on the main page. We found that 0% of them (0 request) were addressed to the original Khanacedemy.org, 27% (3 requests) were made to Google.com and 18% (2 requests) were made to Afs.googleusercontent.com. The less responsive or slowest element that took the longest time to load (393 ms) relates to the external source Ww38.khanacedemy.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 16.7 kB (9%)

Content Size

186.9 kB

After Optimization

170.1 kB

In fact, the total size of Khanacedemy.org main page is 186.9 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. Only 5% of websites need less resources to load. Javascripts take 158.3 kB which makes up the majority of the site volume.

HTML Optimization

-67%

Potential reduce by 10.9 kB

  • Original 16.1 kB
  • After minification 16.0 kB
  • After compression 5.3 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. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 10.9 kB or 67% of the original size.

Image Optimization

-2%

Potential reduce by 239 B

  • Original 11.4 kB
  • After minification 11.1 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. Khanacedemy images are well optimized though.

JavaScript Optimization

-3%

Potential reduce by 5.4 kB

  • Original 158.3 kB
  • After minification 156.5 kB
  • After compression 152.9 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. This website has mostly compressed JavaScripts.

CSS Optimization

-18%

Potential reduce by 176 B

  • Original 991 B
  • After minification 991 B
  • After compression 815 B

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. Khanacedemy.org needs all CSS files to be minified and compressed as it can save up to 176 B or 18% of the original size.

Requests Breakdown

Number of requests can be reduced by 3 (30%)

Requests Now

10

After Optimization

7

The browser has sent 10 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Khanacedemy. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 4 to 1 for JavaScripts and as a result speed up the page load time.

Accessibility Review

khanacedemy.org accessibility score

63

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.

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

<frame> or <iframe> elements do not have a title

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

khanacedemy.org best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

khanacedemy.org SEO score

83

Search Engine Optimization Advices

Crawling and Indexing

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

Impact

Issue

High

Page is blocked from indexing

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 doesn't use legible font sizes

Language and Encoding

  • Language Detected

    N/A

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Khanacedemy.org can be misinterpreted by Google and other search engines. Unfortunately we cannot identify language used on the page (probably there is a mix of languages, too little text or something else), while the claimed language is English. Our system also found out that Khanacedemy.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 Khanacedemy. 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: