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

name

value

score

weighting

FCP (First Contentful Paint)

Value4.4 s

17/100

10%

LCP (Largest Contentful Paint)

Value22.9 s

0/100

25%

SI (Speed Index)

Value25.3 s

0/100

10%

TBT (Total Blocking Time)

Value13,240 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.078

95/100

15%

TTI (Time to Interactive)

Value39.7 s

0/100

10%

en.class101.net

18 ms

574 ms

en

1099 ms

polyfill.min.js

1568 ms

pretendard-chunked-dynamic-subset.css

19 ms

Our browser made a total of 94 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original En.class101.net, 65% (61 requests) were made to Class101.net and 33% (31 requests) were made to Cdn.class101.net. The less responsive or slowest element that took the longest time to load (1.6 sec) relates to the external source Polyfill-fastly.io.

Content Size

2.4 MB

After Optimization

1.9 MB

In fact, the total size of En.class101.net main page is 2.4 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. Javascripts take 2.0 MB which makes up the majority of the site volume.

HTML Optimization

-67%

Potential reduce by 248.4 kB

Original 369.2 kB
After minification 369.1 kB
After compression 120.8 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 248.4 kB or 67% of the original size.

JavaScript Optimization

-14%

Potential reduce by 289.8 kB

Original 2.0 MB
After minification 2.0 MB
After compression 1.7 MB

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 289.8 kB or 14% of the original size.

CSS Optimization

-0%

Potential reduce by 119 B

Original 50.9 kB
After minification 50.9 kB
After compression 50.8 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. En.class101.net has all CSS files already compressed.

Requests Now

After Optimization

The browser has sent 61 CSS, Javascripts, AJAX and image requests in order to completely render the main page of En CLASS101. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 59 to 1 for JavaScripts and as a result speed up the page load time.

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

Links do not have descriptive text

High

Image elements do not have [alt] attributes

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

High

Page is blocked from indexing

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

EN
Encoding

UTF-8

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 it matches the claimed language. Our system also found out that En.class101.net 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

en.class101.net

Open Graph data is detected on the main page of En CLASS101. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook:

Report Summary

Performance

Accessibility

Best Practices

SEO

CLASS101+ | Learn New Hobbies or Skills Online

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

en.class101.net

en

polyfill.min.js

pretendard-chunked-dynamic-subset.css

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

en.class101.net

en

polyfill.min.js

pretendard-chunked-dynamic-subset.css

8fcb739238c6ca58.css

polyfills-c67a75d1b6f99dc8.js

72625-66bfc36a4e55066f.js

82324-3ccb638b25b5f8ca.js

73783-55650af2cc9fffb1.js

68420-c3bd91c7be18abf7.js

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87032.6b4ab771ed0a6ea8.js

35246.a3203ffe71524b82.js

90409-120f4308c8b761e2.js

33734-8482b87804847453.js

5232-7067e5a81901a111.js

15760-04d22ed050af9eb9.js

58670.9d20e712738b701a.js

44065.072e8ebea458c086.js

48146.8cd8b22312d810bd.js

86946.42e65ca349c9a0b5.js

webpack-aabdd8626a39c714.js

framework-4978197a6d13162c.js

main-2a82019c33a194d9.js

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6019edf3-7e1d2ef036045588.js

b71f8916-477c516acf2662ea.js

119577d4-88dc1b473eb60fcc.js

981c104b-d41322ce51c9c18e.js

7884-9bad1c9bc9922bd6.js

21468-99e6971537e39037.js

67240-15b744edd6bfad53.js

72517-2a12e21bec499895.js

14136-fe1c59b6a676ce00.js

1183-84d447cc48bc7321.js

97298-d952c99a8e28f7fc.js

25890-394bec221c08d797.js

72792-e1efb6139f00f0c6.js

79950-3fb5145fc0fa19ba.js

75427-fda8a227c21e24ef.js

40202-224d6a0512fd923e.js

40244-18ff7170a315f047.js

21054-786d31028dba8e72.js

24158-2cf4e23f09390914.js

36153-5172b593d584760e.js