Access en.class101.net. CLASS101+ | Learn New Hobbies or Skills Online

Report Summary

name

value

score

weighting

FCP (First Contentful Paint)

Value7.5 s

1/100

10%

LCP (Largest Contentful Paint)

Value9.0 s

1/100

25%

SI (Speed Index)

Value31.6 s

0/100

10%

TBT (Total Blocking Time)

Value19,110 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.566

12/100

15%

TTI (Time to Interactive)

Value54.5 s

0/100

10%

en.class101.net

12 ms

class101.co

438 ms

233 ms

Our browser made a total of 3 requests to load all elements on the main page. We found that 33% of them (1 request) were addressed to the original En.class101.net, 33% (1 request) were made to Class101.co and 33% (1 request) were made to Class101.net. The less responsive or slowest element that took the longest time to load (438 ms) relates to the external source Class101.co.

Content Size

22.7 MB

After Optimization

20.5 MB

In fact, the total size of En.class101.net main page is 22.7 MB. This result falls within the top 5000 of lightweight and thus fast loading web pages. Only a small number of websites need less resources to load. Images take 22.4 MB which makes up the majority of the site volume.

HTML Optimization

-17%

Potential reduce by 22 B

Original 132 B
After minification 132 B
After compression 110 B

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 22 B or 17% of the original size.

Image Optimization

-9%

Potential reduce by 2.1 MB

Original 22.4 MB
After minification 20.3 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. En CLASS101 images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 191 B

Original 136.0 kB
After minification 136.0 kB
After compression 135.8 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

-78%

Potential reduce by 142.4 kB

Original 182.4 kB
After minification 162.6 kB
After compression 40.0 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. En.class101.net needs all CSS files to be minified and compressed as it can save up to 142.4 kB or 78% of the original size.

Requests Now

After Optimization

Besides the initial HTML request, no CSS, Javascripts, AJAX or image files were requested in the course of web page rendering.

Accessibility Issues

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.

High

Buttons do not have an accessible name

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

These items highlight common accessibility best practices.

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

Search Engine Optimization Advices

Format your HTML in a way that enables crawlers to better understand your app’s content.

High

Image elements do not have [alt] attributes

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/).

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

Language Detected

EN
Language Claimed

N/A
Encoding

N/A

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise En.class101.net can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that En.class101.net main page’s claimed encoding is . Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

Open Graph description is not detected on the main page of En CLASS101. 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: