Tools & Wizards About Us

Report Summary

  • 30

    Performance

    Renders faster than
    50% of other websites

  • 68

    Accessibility

    Visual factors better than
    that of 33% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 62

    SEO

    Google-friendlier than
    23% of websites

sudokuisland.com

Sudoku Island - Free Sudoku from Easy to Hard, Play Online or Print

Page Load Speed

1.1 sec in total

First Response

35 ms

Resources Loaded

903 ms

Page Rendered

164 ms

About Website

Welcome to sudokuisland.com homepage info - get ready to check Sudoku Island best content right away, or after learning these important things about sudokuisland.com

Play unlimited unique sudoku puzzles with difficulty from easy to extreme. Includes error check and pencil mark tools. Print pages for your island adventure!

Visit sudokuisland.com

Key Findings

We analyzed Sudokuisland.com page load time and found that the first response time was 35 ms and then it took 1.1 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 20% of websites can load faster.

Performance Metrics

sudokuisland.com performance score

30

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.8 s

57/100

10%

LCP (Largest Contentful Paint)

Value7.4 s

4/100

25%

SI (Speed Index)

Value6.6 s

38/100

10%

TBT (Total Blocking Time)

Value1,890 ms

9/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value11.9 s

17/100

10%

Network Requests Diagram

sudokuisland.com

35 ms

www.sudokuisland.com

311 ms

bootstrap-edit.css

45 ms

sudoku.css

59 ms

jquery-latest.js

10 ms

Our browser made a total of 26 requests to load all elements on the main page. We found that 38% of them (10 requests) were addressed to the original Sudokuisland.com, 15% (4 requests) were made to Platform.twitter.com and 8% (2 requests) were made to Pagead2.googlesyndication.com. The less responsive or slowest element that took the longest time to load (396 ms) relates to the external source Facebook.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 84.7 kB (21%)

Content Size

410.3 kB

After Optimization

325.6 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Sudokuisland.com main page is 410.3 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. 65% of websites need less resources to load. Images take 209.5 kB which makes up the majority of the site volume.

HTML Optimization

-86%

Potential reduce by 48.4 kB

  • Original 56.5 kB
  • After minification 35.1 kB
  • After compression 8.1 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 21.5 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 48.4 kB or 86% of the original size.

Image Optimization

-10%

Potential reduce by 20.7 kB

  • Original 209.5 kB
  • After minification 188.8 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. Sudoku Island images are well optimized though.

JavaScript Optimization

-7%

Potential reduce by 7.8 kB

  • Original 118.8 kB
  • After minification 118.8 kB
  • After compression 111.0 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

-31%

Potential reduce by 7.8 kB

  • Original 25.5 kB
  • After minification 25.5 kB
  • After compression 17.7 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. Sudokuisland.com needs all CSS files to be minified and compressed as it can save up to 7.8 kB or 31% of the original size.

Requests Breakdown

Number of requests can be reduced by 10 (42%)

Requests Now

24

After Optimization

14

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 24 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Sudoku Island. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 11 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

sudokuisland.com accessibility score

68

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.

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

ARIA IDs are not unique

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

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Form elements do not have associated labels

Best Practices

sudokuisland.com best practices score

67

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

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

sudokuisland.com SEO score

62

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

Content Best Practices

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

Impact

Issue

High

Image elements do not have [alt] attributes

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 Sudokuisland.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 Sudokuisland.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 Sudoku Island. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: