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codewars.io screenshot

Report Summary

  • 37

    Performance

    Renders faster than
    56% of other websites

  • 92

    Accessibility

    Visual factors better than
    that of 79% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 93

    SEO

    Google-friendlier than
    83% of websites

codewars.io

Codewars - Achieve mastery through coding practice and developer mentorship

Page Load Speed

4.9 sec in total

First Response

78 ms

Resources Loaded

1 sec

Page Rendered

3.8 sec

codewars.io screenshot

About Website

Click here to check amazing Codewars content for United States. Otherwise, check out these important facts you probably never knew about codewars.io

A coding practice website for all programming levels – Join a community of over 3 million developers and improve your coding skills in over 55 programming languages!

Visit codewars.io

Key Findings

We analyzed Codewars.io page load time and found that the first response time was 78 ms and then it took 4.9 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.

Performance Metrics

codewars.io performance score

37

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.4 s

38/100

10%

LCP (Largest Contentful Paint)

Value3.8 s

54/100

25%

SI (Speed Index)

Value6.2 s

43/100

10%

TBT (Total Blocking Time)

Value11,760 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.022

100/100

15%

TTI (Time to Interactive)

Value17.8 s

4/100

10%

Network Requests Diagram

codewars.io

78 ms

www.codewars.com

197 ms

codewars.ec8bf20a4.css

41 ms

webfont.js

34 ms

js

97 ms

Our browser made a total of 69 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Codewars.io, 42% (29 requests) were made to Fonts.gstatic.com and 33% (23 requests) were made to Assets-global.website-files.com. The less responsive or slowest element that took the longest time to load (401 ms) relates to the external source Assets-global.website-files.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 399.6 kB (6%)

Content Size

6.5 MB

After Optimization

6.1 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Codewars.io main page is 6.5 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 6.3 MB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 48.5 kB

  • Original 59.2 kB
  • After minification 59.2 kB
  • After compression 10.7 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 48.5 kB or 82% of the original size.

Image Optimization

-6%

Potential reduce by 348.9 kB

  • Original 6.3 MB
  • After minification 6.0 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. Codewars images are well optimized though.

JavaScript Optimization

-1%

Potential reduce by 503 B

  • Original 57.3 kB
  • After minification 57.3 kB
  • After compression 56.8 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

-6%

Potential reduce by 1.7 kB

  • Original 30.6 kB
  • After minification 30.6 kB
  • After compression 28.9 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. Codewars.io has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 9 (25%)

Requests Now

36

After Optimization

27

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 36 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Codewars. 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

codewars.io

codewars.io

78 ms

www.codewars.com

www.codewars.com

197 ms

codewars.ec8bf20a4.css

codewars.ec8bf20a4.css

41 ms

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webfont.js

34 ms

js

js

97 ms

css2

css2

56 ms

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script.js

58 ms

optimize.js

optimize.js

95 ms

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js

js

132 ms

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Accessibility Review

codewars.io accessibility score

92

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

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

Links do not have a discernible name

Best Practices

codewars.io best practices score

92

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

Missing source maps for large first-party JavaScript

SEO Factors

codewars.io SEO score

93

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

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

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    UTF-8

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

codewars.io

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