Report Summary

  • 26

    Performance

    Renders faster than
    47% of other websites

  • 83

    Accessibility

    Visual factors better than
    that of 56% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 90

    SEO

    Google-friendlier than
    69% of websites

illusionsindex.org

Home - The Illusions Index

Page Load Speed

7.4 sec in total

First Response

404 ms

Resources Loaded

4.9 sec

Page Rendered

2.1 sec

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 404 ms and then it took 7 sec to load all DOM resources and completely render a web page. This is a poor result, as 80% of websites can load faster.

Performance Metrics

illusionsindex.org performance score

26

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value13.4 s

0/100

10%

LCP (Largest Contentful Paint)

Value18.7 s

0/100

25%

SI (Speed Index)

Value14.3 s

1/100

10%

TBT (Total Blocking Time)

Value330 ms

75/100

30%

CLS (Cumulative Layout Shift)

Value0.472

18/100

15%

TTI (Time to Interactive)

Value14.0 s

10/100

10%

Network Requests Diagram

illusionsindex.org

404 ms

illusionsindex.org

368 ms

www.illusionsindex.org

290 ms

www.illusionsindex.org

818 ms

index.php

212 ms

Our browser made a total of 69 requests to load all elements on the main page. We found that 77% of them (53 requests) were addressed to the original Illusionsindex.org, 7% (5 requests) were made to Use.typekit.net and 3% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (1.4 sec) belongs to the original domain Illusionsindex.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 726.8 kB (71%)

Content Size

1.0 MB

After Optimization

301.0 kB

In fact, the total size of Illusionsindex.org main page is 1.0 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. 55% of websites need less resources to load. CSS take 497.6 kB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 21.3 kB

  • Original 26.8 kB
  • After minification 23.7 kB
  • After compression 5.5 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 3.1 kB, which is 12% 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 21.3 kB or 79% of the original size.

Image Optimization

-2%

Potential reduce by 2.0 kB

  • Original 108.5 kB
  • After minification 106.5 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

-67%

Potential reduce by 264.5 kB

  • Original 395.0 kB
  • After minification 377.4 kB
  • After compression 130.4 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 264.5 kB or 67% of the original size.

CSS Optimization

-88%

Potential reduce by 439.0 kB

  • Original 497.6 kB
  • After minification 349.6 kB
  • After compression 58.6 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 needs all CSS files to be minified and compressed as it can save up to 439.0 kB or 88% of the original size.

Requests Breakdown

Number of requests can be reduced by 31 (52%)

Requests Now

60

After Optimization

29

The browser has sent 60 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Illusions Index. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 26 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

illusionsindex.org accessibility score

83

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

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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

illusionsindex.org SEO score

90

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

High

Tap targets are not sized appropriately

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

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