Tools & Wizards About Us

Report Summary

  • 51

    Performance

    Renders faster than
    69% of other websites

  • 83

    Accessibility

    Visual factors better than
    that of 54% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 88

    SEO

    Google-friendlier than
    65% of websites

decodeschool.com

Decode School | Programming Examples | Problem Solving | Online Training

Page Load Speed

5.5 sec in total

First Response

714 ms

Resources Loaded

4.7 sec

Page Rendered

114 ms

About Website

Click here to check amazing Decode School content for India. Otherwise, check out these important facts you probably never knew about decodeschool.com

Learn Programming and Problem Solving with decode school Programming Examples, Tutorials and Courses.

Visit decodeschool.com

Key Findings

We analyzed Decodeschool.com page load time and found that the first response time was 714 ms and then it took 4.8 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

decodeschool.com performance score

51

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.8 s

2/100

10%

LCP (Largest Contentful Paint)

Value8.2 s

2/100

25%

SI (Speed Index)

Value9.4 s

12/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.095

91/100

15%

TTI (Time to Interactive)

Value7.0 s

53/100

10%

Network Requests Diagram

decodeschool.com

714 ms

decodeschool.com

1394 ms

js

88 ms

js

107 ms

sharethis.js

30 ms

Our browser made a total of 26 requests to load all elements on the main page. We found that 58% of them (15 requests) were addressed to the original Decodeschool.com, 19% (5 requests) were made to Fonts.gstatic.com and 8% (2 requests) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (2 sec) belongs to the original domain Decodeschool.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 401.7 kB (74%)

Content Size

540.0 kB

After Optimization

138.4 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Decodeschool.com main page is 540.0 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. 30% of websites need less resources to load. Javascripts take 264.2 kB which makes up the majority of the site volume.

HTML Optimization

-85%

Potential reduce by 27.7 kB

  • Original 32.5 kB
  • After minification 20.0 kB
  • After compression 4.8 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. This page needs HTML code to be minified as it can gain 12.4 kB, which is 38% 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 27.7 kB or 85% of the original size.

Image Optimization

-14%

Potential reduce by 2.9 kB

  • Original 20.5 kB
  • After minification 17.6 kB

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. Obviously, Decode School needs image optimization as it can save up to 2.9 kB or 14% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-68%

Potential reduce by 180.3 kB

  • Original 264.2 kB
  • After minification 257.4 kB
  • After compression 83.9 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 180.3 kB or 68% of the original size.

CSS Optimization

-86%

Potential reduce by 190.8 kB

  • Original 222.8 kB
  • After minification 175.7 kB
  • After compression 32.1 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. Decodeschool.com needs all CSS files to be minified and compressed as it can save up to 190.8 kB or 86% of the original size.

Requests Breakdown

Number of requests can be reduced by 14 (78%)

Requests Now

18

After Optimization

4

  • Images
  • JavaScript
  • CSS

The browser has sent 18 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Decode School. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 9 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

decodeschool.com accessibility score

83

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

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

Best Practices

decodeschool.com best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

decodeschool.com SEO score

88

Search Engine Optimization Advices

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

    N/A

  • Encoding

    UTF-8

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

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