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kahnacademy.org screenshot

Report Summary

  • 28

    Performance

    Renders faster than
    47% of other websites

  • 86

    Accessibility

    Visual factors better than
    that of 61% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 98

    SEO

    Google-friendlier than
    92% of websites

kahnacademy.org

Khan Academy

Page Load Speed

2.4 sec in total

First Response

461 ms

Resources Loaded

1.3 sec

Page Rendered

586 ms

kahnacademy.org screenshot

About Website

Click here to check amazing Kahn Academy content. Otherwise, check out these important facts you probably never knew about kahnacademy.org

Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, wo...

Visit kahnacademy.org

Key Findings

We analyzed Kahnacademy.org page load time and found that the first response time was 461 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 40% of websites can load faster.

Performance Metrics

kahnacademy.org performance score

28

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.9 s

51/100

10%

LCP (Largest Contentful Paint)

Value8.1 s

2/100

25%

SI (Speed Index)

Value5.2 s

59/100

10%

TBT (Total Blocking Time)

Value2,630 ms

4/100

30%

CLS (Cumulative Layout Shift)

Value0.028

100/100

15%

TTI (Time to Interactive)

Value17.3 s

4/100

10%

Network Requests Diagram

www.khanacademy.org

461 ms

analytics.js

64 ms

homepage-package-bdd7db.css

169 ms

mobile-package-9eea13.css

154 ms

login-package-73e11b.css

156 ms

Our browser made a total of 27 requests to load all elements on the main page. We found that 0% of them (0 request) were addressed to the original Kahnacademy.org, 15% (4 requests) were made to Khanacademy.org and 7% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (461 ms) relates to the external source Khanacademy.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 848.4 kB (74%)

Content Size

1.2 MB

After Optimization

305.2 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Kahnacademy.org main page is 1.2 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. 50% of websites need less resources to load. Javascripts take 513.6 kB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 276.4 kB

  • Original 333.5 kB
  • After minification 322.8 kB
  • After compression 57.1 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 276.4 kB or 83% of the original size.

Image Optimization

-3%

Potential reduce by 1.4 kB

  • Original 52.5 kB
  • After minification 51.0 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. Kahn Academy images are well optimized though.

JavaScript Optimization

-70%

Potential reduce by 358.5 kB

  • Original 513.6 kB
  • After minification 513.6 kB
  • After compression 155.2 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 358.5 kB or 70% of the original size.

CSS Optimization

-84%

Potential reduce by 212.2 kB

  • Original 254.1 kB
  • After minification 254.1 kB
  • After compression 41.9 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. Kahnacademy.org needs all CSS files to be minified and compressed as it can save up to 212.2 kB or 84% of the original size.

Requests Breakdown

Number of requests can be reduced by 14 (61%)

Requests Now

23

After Optimization

9

  • Images
  • JavaScript
  • CSS

The browser has sent 23 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Kahn Academy. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 15 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

www.khanacademy.org

www.khanacademy.org

461 ms

analytics.js

analytics.js

64 ms

homepage-package-bdd7db.css

homepage-package-bdd7db.css

169 ms

mobile-package-9eea13.css

mobile-package-9eea13.css

154 ms

login-package-73e11b.css

login-package-73e11b.css

156 ms

background-learner.jpg

background-learner.jpg

214 ms

ycla-scrawl-en.png

ycla-scrawl-en.png

109 ms

ycla-hashtag-en.png

ycla-hashtag-en.png

110 ms

collect

collect

107 ms

fbevents.js

fbevents.js

115 ms

homepage-background-placeholder.png

homepage-background-placeholder.png

103 ms

Proxima-Nova-Regular.woff

Proxima-Nova-Regular.woff

106 ms

Proxima-Nova-Semibold.woff

Proxima-Nova-Semibold.woff

96 ms

corelibs-package-50db94.js

corelibs-package-50db94.js

122 ms

corelibs-legacy-package-ac83a0.js

corelibs-legacy-package-ac83a0.js

122 ms

shared-package-4b45ee.js

shared-package-4b45ee.js

120 ms

shared-styles-package-dbe760.js

shared-styles-package-dbe760.js

117 ms

page-package-54843e.js

page-package-54843e.js

115 ms

user-progress-cache-package-f97c36.js

user-progress-cache-package-f97c36.js

114 ms

package-manifest-en.258e58.js

package-manifest-en.258e58.js

88 ms

homepage-package-77a9f4.js

homepage-package-77a9f4.js

116 ms

shared-components-package-5bd6f9.js

shared-components-package-5bd6f9.js

117 ms

hover-card-package-5a84a2.js

hover-card-package-5a84a2.js

122 ms

react-package-b164f2.js

react-package-b164f2.js

121 ms

react-components-package-a7e18c.js

react-components-package-a7e18c.js

120 ms

login-package-e3729e.js

login-package-e3729e.js

125 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

70 ms

Accessibility Review

kahnacademy.org accessibility score

86

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

Elements with an ARIA [role] that require children to contain a specific [role] are missing some or all of those required children.

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

kahnacademy.org best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

kahnacademy.org SEO score

98

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

High

Tap targets are not sized appropriately

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 Kahnacademy.org 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 Kahnacademy.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

kahnacademy.org

Open Graph data is detected on the main page of Kahn Academy. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: