Tools & Wizards About Us
dev.udemy.com screenshot

Report Summary

  • 26

    Performance

    Renders faster than
    46% of other websites

  • 98

    Accessibility

    Visual factors better than
    that of 94% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 75

    SEO

    Google-friendlier than
    32% of websites

dev.udemy.com

Online Courses - Learn Anything, On Your Schedule | Udemy

Page Load Speed

1.4 sec in total

First Response

315 ms

Resources Loaded

1 sec

Page Rendered

90 ms

dev.udemy.com screenshot

About Website

Click here to check amazing Dev Udemy content for India. Otherwise, check out these important facts you probably never knew about dev.udemy.com

Udemy is an online learning and teaching marketplace with over 155,000 courses and 40 million students. Learn programming, marketing, data science and more.

Visit dev.udemy.com

Key Findings

We analyzed Dev.udemy.com page load time and found that the first response time was 315 ms and then it took 1.1 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 20% of websites can load faster.

Performance Metrics

dev.udemy.com performance score

26

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.4 s

70/100

10%

LCP (Largest Contentful Paint)

Value5.4 s

21/100

25%

SI (Speed Index)

Value6.5 s

38/100

10%

TBT (Total Blocking Time)

Value2,320 ms

5/100

30%

CLS (Cumulative Layout Shift)

Value0.234

53/100

15%

TTI (Time to Interactive)

Value18.6 s

3/100

10%

Network Requests Diagram

dev.udemy.com

315 ms

udemy.css

119 ms

style-cf.css

92 ms

css

118 ms

305025425.js

190 ms

Our browser made a total of 19 requests to load all elements on the main page. We found that 37% of them (7 requests) were addressed to the original Dev.udemy.com, 21% (4 requests) were made to Udemy.com and 21% (4 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (315 ms) belongs to the original domain Dev.udemy.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 2.9 MB (76%)

Content Size

3.8 MB

After Optimization

886.1 kB

  • HTML
  • JavaScript
  • CSS

In fact, the total size of Dev.udemy.com main page is 3.8 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. 60% of websites need less resources to load. Javascripts take 2.6 MB which makes up the majority of the site volume.

HTML Optimization

-73%

Potential reduce by 11.1 kB

  • Original 15.1 kB
  • After minification 13.5 kB
  • After compression 4.1 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. This page needs HTML code to be minified as it can gain 1.7 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 11.1 kB or 73% of the original size.

JavaScript Optimization

-75%

Potential reduce by 2.0 MB

  • Original 2.6 MB
  • After minification 2.6 MB
  • After compression 660.2 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 2.0 MB or 75% of the original size.

CSS Optimization

-80%

Potential reduce by 893.3 kB

  • Original 1.1 MB
  • After minification 1.1 MB
  • After compression 221.8 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. Dev.udemy.com needs all CSS files to be minified and compressed as it can save up to 893.3 kB or 80% of the original size.

Requests Breakdown

Number of requests can be reduced by 9 (64%)

Requests Now

14

After Optimization

5

  • AJAX
  • JavaScript
  • CSS

The browser has sent 14 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Dev Udemy. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 10 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

dev.udemy.com

dev.udemy.com

315 ms

udemy.css

udemy.css

119 ms

style-cf.css

style-cf.css

92 ms

css

css

118 ms

305025425.js

305025425.js

190 ms

en-us.js

en-us.js

102 ms

require.js

require.js

112 ms

main.conf.js

main.conf.js

189 ms

event

event

57 ms

angular.templates.js

angular.templates.js

198 ms

jquery.min.js

jquery.min.js

73 ms

handlebars.templates.js

handlebars.templates.js

197 ms

ud.package.common.js

ud.package.common.js

290 ms

u-WUoqrET9fUeobQW7jkRT8E0i7KZn-EPnyo3HZu7kw.woff

u-WUoqrET9fUeobQW7jkRT8E0i7KZn-EPnyo3HZu7kw.woff

28 ms

DXI1ORHCpsQm3Vp6mXoaTRa1RVmPjeKy21_GQJaLlJI.woff

DXI1ORHCpsQm3Vp6mXoaTRa1RVmPjeKy21_GQJaLlJI.woff

33 ms

MTP_ySUJH_bn48VBG8sNSha1RVmPjeKy21_GQJaLlJI.woff

MTP_ySUJH_bn48VBG8sNSha1RVmPjeKy21_GQJaLlJI.woff

39 ms

k3k702ZOKiLJc3WVjuplzBa1RVmPjeKy21_GQJaLlJI.woff

k3k702ZOKiLJc3WVjuplzBa1RVmPjeKy21_GQJaLlJI.woff

39 ms

angular.min.js

angular.min.js

73 ms

handlebars.min.js

handlebars.min.js

35 ms

Accessibility Review

dev.udemy.com accessibility score

98

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.

Best Practices

dev.udemy.com 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

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

dev.udemy.com SEO score

75

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

Document doesn't have a valid hreflang

Crawling and Indexing

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

Impact

Issue

High

Links are not crawlable

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 Dev.udemy.com 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 Dev.udemy.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

dev.udemy.com

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