Report Summary

  • 18

    Performance

    Renders faster than
    34% of other websites

  • 91

    Accessibility

    Visual factors better than
    that of 78% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 92

    SEO

    Google-friendlier than
    75% of websites

udacity.org

Learn the Latest Tech Skills; Advance Your Career | Udacity

Page Load Speed

5.8 sec in total

First Response

94 ms

Resources Loaded

1.1 sec

Page Rendered

4.6 sec

udacity.org screenshot

About Website

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

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Key Findings

We analyzed Udacity.org page load time and found that the first response time was 94 ms and then it took 5.7 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

udacity.org performance score

18

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.5 s

34/100

10%

LCP (Largest Contentful Paint)

Value10.3 s

0/100

25%

SI (Speed Index)

Value18.2 s

0/100

10%

TBT (Total Blocking Time)

Value31,270 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.032

100/100

15%

TTI (Time to Interactive)

Value47.3 s

0/100

10%

Network Requests Diagram

udacity.org

94 ms

www.udacity.com

167 ms

0bda84c1563dccd05c0d.css

49 ms

16579e70d435d1d57f6a.css

146 ms

9549c19393b488f750c7.css

115 ms

Our browser made a total of 80 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Udacity.org, 95% (76 requests) were made to Udacity.com and 4% (3 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (444 ms) relates to the external source Udacity.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 94.2 kB (4%)

Content Size

2.6 MB

After Optimization

2.5 MB

In fact, the total size of Udacity.org main page is 2.6 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. 80% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 2.4 MB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 69.4 kB

  • Original 85.3 kB
  • After minification 85.1 kB
  • After compression 15.9 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 69.4 kB or 81% of the original size.

Image Optimization

-1%

Potential reduce by 24.2 kB

  • Original 2.4 MB
  • After minification 2.4 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. Udacity images are well optimized though.

JavaScript Optimization

-1%

Potential reduce by 284 B

  • Original 27.0 kB
  • After minification 27.0 kB
  • After compression 26.7 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. This website has mostly compressed JavaScripts.

CSS Optimization

-1%

Potential reduce by 314 B

  • Original 24.7 kB
  • After minification 24.7 kB
  • After compression 24.3 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 33 (45%)

Requests Now

73

After Optimization

40

The browser has sent 73 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 25 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

udacity.org accessibility score

91

Accessibility Issues

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

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

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

udacity.org SEO score

92

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

    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: