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illusionsindex.org screenshot

Report Summary

  • 56

    Performance

    Renders faster than
    72% of other websites

  • 85

    Accessibility

    Visual factors better than
    that of 58% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 92

    SEO

    Google-friendlier than
    74% of websites

illusionsindex.org

Home - The Illusions Index

Page Load Speed

2.3 sec in total

First Response

288 ms

Resources Loaded

1.7 sec

Page Rendered

266 ms

illusionsindex.org screenshot

About Website

Welcome to illusionsindex.org homepage info - get ready to check Illusions Index best content for United States right away, or after learning these important things about illusionsindex.org

The Illusions Index is a fully searchable curated collection of illusions brought to you by the Centre for the Study of Perceptual Experience.

Visit illusionsindex.org

Key Findings

We analyzed Illusionsindex.org page load time and found that the first response time was 288 ms and then it took 2 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.

Performance Metrics

illusionsindex.org performance score

56

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.0 s

24/100

10%

LCP (Largest Contentful Paint)

Value5.3 s

21/100

25%

SI (Speed Index)

Value4.1 s

80/100

10%

TBT (Total Blocking Time)

Value110 ms

97/100

30%

CLS (Cumulative Layout Shift)

Value0.348

32/100

15%

TTI (Time to Interactive)

Value5.7 s

68/100

10%

Network Requests Diagram

illusionsindex.org

288 ms

illusionsindex.org

339 ms

www.illusionsindex.org

592 ms

nct5oto.css

187 ms

theme.css

173 ms

Our browser made a total of 39 requests to load all elements on the main page. We found that 13% of them (5 requests) were addressed to the original Illusionsindex.org, 54% (21 requests) were made to A.storyblok.com and 26% (10 requests) were made to Use.typekit.net. The less responsive or slowest element that took the longest time to load (592 ms) belongs to the original domain Illusionsindex.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 98.6 kB (13%)

Content Size

771.2 kB

After Optimization

672.6 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Illusionsindex.org main page is 771.2 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. 60% of websites need less resources to load. Images take 698.4 kB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 24.1 kB

  • Original 29.4 kB
  • After minification 22.1 kB
  • After compression 5.3 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 7.3 kB, which is 25% 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 24.1 kB or 82% of the original size.

Image Optimization

-10%

Potential reduce by 72.7 kB

  • Original 698.4 kB
  • After minification 625.6 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. Illusions Index images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 12 B

  • Original 4.9 kB
  • After minification 4.9 kB
  • After compression 4.9 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. This website has mostly compressed JavaScripts.

CSS Optimization

-5%

Potential reduce by 1.7 kB

  • Original 38.6 kB
  • After minification 38.6 kB
  • After compression 36.9 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. Illusionsindex.org has all CSS files already compressed.

Requests Breakdown

We found no issues to fix!

Requests Now

27

After Optimization

27

  • Images
  • JavaScript
  • CSS

The browser has sent 27 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Illusions Index. According to our analytics all requests are already optimized.

Network Requests Diagram

illusionsindex.org

illusionsindex.org

288 ms

illusionsindex.org

illusionsindex.org

339 ms

www.illusionsindex.org

www.illusionsindex.org

592 ms

nct5oto.css

nct5oto.css

187 ms

theme.css

theme.css

173 ms

theme.js

theme.js

411 ms

c2388a2646.js

c2388a2646.js

98 ms

js

js

60 ms

p.css

p.css

23 ms

logo-home.png

logo-home.png

27 ms

30x29

30x29

50 ms

20x19

20x19

50 ms

home-banner-bg.jpg

home-banner-bg.jpg

26 ms

bg-btn-top-r-white.png

bg-btn-top-r-white.png

24 ms

bg-btn-bottom-l-white.png

bg-btn-bottom-l-white.png

23 ms

27 ms

279 ms

54 ms

102 ms

48 ms

bg_gray.jpg

bg_gray.jpg

48 ms

60 ms

50 ms

68 ms

81 ms

81 ms

84 ms

logo-footer.png

logo-footer.png

70 ms

35x35

35x35

87 ms

35x35

35x35

97 ms

d

d

4 ms

d

d

11 ms

d

d

15 ms

d

d

20 ms

d

d

16 ms

d

d

15 ms

d

d

16 ms

d

d

16 ms

d

d

19 ms

Accessibility Review

illusionsindex.org accessibility score

85

Accessibility Issues

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

illusionsindex.org 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

Page has valid source maps

SEO Factors

illusionsindex.org SEO score

92

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

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

    EN

  • Encoding

    UTF-8

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

illusionsindex.org

Open Graph description is not detected on the main page of Illusions Index. 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: