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

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vaccine.udemy.com

30 ms

v1

33 ms

Our browser made a total of 2 requests to load all elements on the main page. We found that all of those requests were addressed to Vaccine.udemy.com and no external sources were called. The less responsive or slowest element that took the longest time to load (33 ms) belongs to the original domain Vaccine.udemy.com.

Content Size

63.3 kB

After Optimization

54.5 kB

In fact, the total size of Vaccine.udemy.com main page is 63.3 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 28.8 kB which makes up the majority of the site volume.

HTML Optimization

-60%

Potential reduce by 8.5 kB

Original 14.3 kB
After minification 14.3 kB
After compression 5.8 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 8.5 kB or 60% of the original size.

JavaScript Optimization

-1%

Potential reduce by 280 B

Original 28.8 kB
After minification 28.8 kB
After compression 28.5 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

-0%

Potential reduce by 0 B

Original 20.2 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.

Requests Now

After Optimization

The browser has sent 1 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Vaccine Udemy. According to our analytics all requests are already optimized.

Language and Encoding

Language Detected

Language Claimed

Encoding

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Vaccine.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 Vaccine.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

vaccine.udemy.com

Open Graph description is not detected on the main page of Vaccine Udemy. 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: