Tools & Wizards About Us

Report Summary

  • 18

    Performance

    Renders faster than
    34% of other websites

  • 94

    Accessibility

    Visual factors better than
    that of 83% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 86

    SEO

    Google-friendlier than
    60% of websites

udacity.org

Learn the Latest Tech Skills; Advance Your Career | Udacity

Page Load Speed

110.8 sec in total

First Response

148 ms

Resources Loaded

6.9 sec

Page Rendered

103.8 sec

About Website

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Key Findings

We analyzed Udacity.org page load time and found that the first response time was 148 ms and then it took 110.7 sec to load all DOM resources and completely render a web page. This is a poor result, as 95% of websites can load faster.

Performance Metrics

udacity.org performance score

18

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.1 s

22/100

10%

LCP (Largest Contentful Paint)

Value6.2 s

11/100

25%

SI (Speed Index)

Value14.1 s

1/100

10%

TBT (Total Blocking Time)

Value29,160 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.124

83/100

15%

TTI (Time to Interactive)

Value49.7 s

0/100

10%

Network Requests Diagram

udacity.org

148 ms

www.udacity.com

31 ms

www.udacity.com

498 ms

7f2523fe9e19d89e.css

118 ms

76c8ccc82bdb1369.css

165 ms

Our browser made a total of 109 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Udacity.org, 61% (66 requests) were made to Cdn.sanity.io and 28% (31 requests) were made to Udacity.com. The less responsive or slowest element that took the longest time to load (3.8 sec) relates to the external source Cdn.sanity.io.

Page Optimization Overview & Recommendations

Page size can be reduced by 140.0 MB (42%)

Content Size

331.2 MB

After Optimization

191.3 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Udacity.org main page is 331.2 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. Only a small number of websites need less resources to load. Images take 329.5 MB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 1.4 MB

  • Original 1.7 MB
  • After minification 1.7 MB
  • After compression 358.3 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 1.4 MB or 79% of the original size.

Image Optimization

-42%

Potential reduce by 138.6 MB

  • Original 329.5 MB
  • After minification 190.8 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. Obviously, Udacity needs image optimization as it can save up to 138.6 MB or 42% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-0%

Potential reduce by 0 B

  • Original 54.2 kB
  • After minification 54.2 kB
  • After compression 54.2 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. This website has mostly compressed JavaScripts.

CSS Optimization

-2%

Potential reduce by 71 B

  • Original 3.4 kB
  • After minification 3.4 kB
  • After compression 3.4 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. Udacity.org has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 18 (17%)

Requests Now

106

After Optimization

88

  • Images
  • JavaScript
  • CSS

The browser has sent 106 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Udacity. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 19 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

udacity.org accessibility score

94

Accessibility Issues

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

Best Practices

udacity.org best practices score

75

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

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

udacity.org SEO score

86

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

Links do not have descriptive text

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

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