Tools & Wizards About Us

Report Summary

  • 25

    Performance

    Renders faster than
    44% of other websites

  • 88

    Accessibility

    Visual factors better than
    that of 68% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 93

    SEO

    Google-friendlier than
    83% of websites

vsl3.co.uk

VSL# - Highly Concentrated, Highly Researched Probiotic Supplements

Page Load Speed

5.9 sec in total

First Response

414 ms

Resources Loaded

4.4 sec

Page Rendered

1.1 sec

About Website

Welcome to vsl3.co.uk homepage info - get ready to check VSL 3 best content for United Kingdom right away, or after learning these important things about vsl3.co.uk

The experts in evidence based probiotic supplements. Our range of supplements deliver high doses of live bacteria to your gut and are trusted and recommended by healthcare professionals worldwide.

Visit vsl3.co.uk

Key Findings

We analyzed Vsl3.co.uk page load time and found that the first response time was 414 ms and then it took 5.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

vsl3.co.uk performance score

25

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.1 s

46/100

10%

LCP (Largest Contentful Paint)

Value5.8 s

15/100

25%

SI (Speed Index)

Value11.0 s

6/100

10%

TBT (Total Blocking Time)

Value3,260 ms

2/100

30%

CLS (Cumulative Layout Shift)

Value0.002

100/100

15%

TTI (Time to Interactive)

Value23.9 s

1/100

10%

Network Requests Diagram

www.vsl3.co.uk

414 ms

gtm.js

111 ms

preloads.js

72 ms

load_feature-9f951eb7d8d53973c719de211f807d63af81c644e5b9a6ae72661ac408d472f6.js

50 ms

storefront-80e528be853eac23af2454534897ca9536b1d3d04aa043b042f34879a3c111c8.js

44 ms

Our browser made a total of 93 requests to load all elements on the main page. We found that 22% of them (20 requests) were addressed to the original Vsl3.co.uk, 24% (22 requests) were made to I.shgcdn.com and 8% (7 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (2.9 sec) relates to the external source I.shgcdn.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 157.0 kB (8%)

Content Size

1.9 MB

After Optimization

1.8 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Vsl3.co.uk main page is 1.9 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. Only a small number of websites need less resources to load. Images take 961.4 kB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 138.4 kB

  • Original 177.3 kB
  • After minification 168.7 kB
  • After compression 38.9 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. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 138.4 kB or 78% of the original size.

Image Optimization

-0%

Potential reduce by 377 B

  • Original 961.4 kB
  • After minification 961.0 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. VSL 3 images are well optimized though.

JavaScript Optimization

-2%

Potential reduce by 17.7 kB

  • Original 733.1 kB
  • After minification 733.1 kB
  • After compression 715.4 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. This website has mostly compressed JavaScripts.

CSS Optimization

-1%

Potential reduce by 537 B

  • Original 56.9 kB
  • After minification 56.9 kB
  • After compression 56.4 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. Vsl3.co.uk has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 50 (66%)

Requests Now

76

After Optimization

26

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 76 CSS, Javascripts, AJAX and image requests in order to completely render the main page of VSL 3. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 47 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

vsl3.co.uk accessibility score

88

Accessibility Issues

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-*] attributes do not match their roles

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

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

Best Practices

vsl3.co.uk 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

High

Page has valid source maps

SEO Factors

vsl3.co.uk SEO score

93

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

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 Vsl3.co.uk 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 Vsl3.co.uk 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 VSL 3. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: