Tools & Wizards About Us
killersudoku.nl screenshot

Report Summary

  • 98

    Performance

    Renders faster than
    95% of other websites

  • 60

    Accessibility

    Visual factors better than
    that of 26% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 67

    SEO

    Google-friendlier than
    25% of websites

killersudoku.nl

KillerSudoku.nl - Killer Sudoku's online oplossen of printen

Page Load Speed

2.3 sec in total

First Response

461 ms

Resources Loaded

1.7 sec

Page Rendered

160 ms

killersudoku.nl screenshot

About Website

Welcome to killersudoku.nl homepage info - get ready to check Killer Sudoku best content for Netherlands right away, or after learning these important things about killersudoku.nl

Elke dag een nieuwe Killer Sudoku, duizenden Killer Sudoku's online oplossen of printen, uitleg over de Killer Sudoku

Visit killersudoku.nl

Key Findings

We analyzed Killersudoku.nl page load time and found that the first response time was 461 ms and then it took 1.8 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 30% of websites can load faster.

Performance Metrics

killersudoku.nl performance score

98

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.7 s

92/100

10%

LCP (Largest Contentful Paint)

Value1.8 s

98/100

25%

SI (Speed Index)

Value2.6 s

97/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.007

100/100

15%

TTI (Time to Interactive)

Value1.7 s

100/100

10%

Network Requests Diagram

killersudoku.nl

461 ms

opmaak.css

186 ms

logo.png

208 ms

print.png

224 ms

archive.png

208 ms

Our browser made a total of 48 requests to load all elements on the main page. We found that 23% of them (11 requests) were addressed to the original Killersudoku.nl, 13% (6 requests) were made to Pagead2.googlesyndication.com and 13% (6 requests) were made to C.betrad.com. The less responsive or slowest element that took the longest time to load (461 ms) belongs to the original domain Killersudoku.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 177.4 kB (58%)

Content Size

305.8 kB

After Optimization

128.4 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Killersudoku.nl main page is 305.8 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 169.7 kB which makes up the majority of the site volume.

HTML Optimization

-90%

Potential reduce by 48.9 kB

  • Original 54.1 kB
  • After minification 44.3 kB
  • After compression 5.2 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 9.9 kB, which is 18% 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 48.9 kB or 90% of the original size.

Image Optimization

-12%

Potential reduce by 9.0 kB

  • Original 78.4 kB
  • After minification 69.4 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, Killer Sudoku needs image optimization as it can save up to 9.0 kB or 12% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-69%

Potential reduce by 116.6 kB

  • Original 169.7 kB
  • After minification 169.5 kB
  • After compression 53.0 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 116.6 kB or 69% of the original size.

CSS Optimization

-77%

Potential reduce by 2.8 kB

  • Original 3.6 kB
  • After minification 2.4 kB
  • After compression 815 B

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. Killersudoku.nl needs all CSS files to be minified and compressed as it can save up to 2.8 kB or 77% of the original size.

Requests Breakdown

Number of requests can be reduced by 21 (47%)

Requests Now

45

After Optimization

24

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 45 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Killer Sudoku. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 14 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

killersudoku.nl

killersudoku.nl

461 ms

opmaak.css

opmaak.css

186 ms

logo.png

logo.png

208 ms

print.png

print.png

224 ms

archive.png

archive.png

208 ms

adsbygoogle.js

adsbygoogle.js

5 ms

printer.png

printer.png

281 ms

vijfsterren.png

vijfsterren.png

189 ms

voorbeeldbinair.png

voorbeeldbinair.png

202 ms

ca-pub-2222259042077798.js

ca-pub-2222259042077798.js

41 ms

zrt_lookup.html

zrt_lookup.html

39 ms

show_ads_impl.js

show_ads_impl.js

56 ms

background.png

background.png

183 ms

afb_dag.php

afb_dag.php

200 ms

transparent.gif

transparent.gif

191 ms

ads

ads

181 ms

osd.js

osd.js

3 ms

103 ms

adj

adj

58 ms

beacon

beacon

40 ms

AYEE00533581.jpg

AYEE00533581.jpg

121 ms

verify_selector.js

verify_selector.js

152 ms

blank.gif

blank.gif

137 ms

beacon.js

beacon.js

58 ms

verifyr.js

verifyr.js

33 ms

activityi;src=4236808;type=invmedia;cat=ijhardnr;ord=1781432592

activityi;src=4236808;type=invmedia;cat=ijhardnr;ord=1781432592

92 ms

activityi;src=4236808;type=invmedia;cat=hedrhdaz;ord=1781432592

activityi;src=4236808;type=invmedia;cat=hedrhdaz;ord=1781432592

117 ms

activityi;src=4236808;type=invmedia;cat=qk1cfvwl;ord=1781432592

activityi;src=4236808;type=invmedia;cat=qk1cfvwl;ord=1781432592

127 ms

activityi;src=4236808;type=invmedia;cat=aoyjbkr6;ord=1781432592

activityi;src=4236808;type=invmedia;cat=aoyjbkr6;ord=1781432592

120 ms

activityi;src=4236808;type=invmedia;cat=4ztf2oue;ord=1781432592

activityi;src=4236808;type=invmedia;cat=4ztf2oue;ord=1781432592

117 ms

bg.png

bg.png

49 ms

0

0

112 ms

adchoices.en.png

adchoices.en.png

75 ms

surly.js

surly.js

76 ms

ba.html

ba.html

35 ms

pixel

pixel

25 ms

4.gif

4.gif

58 ms

lidar.js

lidar.js

20 ms

sbhK2lTE.js

sbhK2lTE.js

65 ms

pixel

pixel

65 ms

pixel

pixel

64 ms

4311.js

4311.js

19 ms

cTrvNaRi.html

cTrvNaRi.html

9 ms

Tqng9ngJVK4Gqvh3e602hP-HqlN49KFEUSDtmrOPmWo.js

Tqng9ngJVK4Gqvh3e602hP-HqlN49KFEUSDtmrOPmWo.js

8 ms

setuid

setuid

68 ms

sd

sd

73 ms

box_19_top-right.png

box_19_top-right.png

13 ms

ci.png

ci.png

14 ms

Accessibility Review

killersudoku.nl accessibility score

60

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.

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best Practices

killersudoku.nl best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Serves images with low resolution

SEO Factors

killersudoku.nl SEO score

67

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

Image elements do not have [alt] attributes

Language and Encoding

  • Language Detected

    NL

  • Language Claimed

    EN

  • Encoding

    ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Killersudoku.nl can be misinterpreted by Google and other search engines. Our service has detected that Dutch is used on the page, and it does not match the claimed English language. Our system also found out that Killersudoku.nl main page’s claimed encoding is iso-8859-1. 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

killersudoku.nl

Open Graph description is not detected on the main page of Killer Sudoku. 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: