Report Summary

  • 6

    Performance

    Renders faster than
    21% of other websites

  • 88

    Accessibility

    Visual factors better than
    that of 70% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 97

    SEO

    Google-friendlier than
    92% of websites

lensonline.be

Contactlenzen bestellen · LensOnline®

Page Load Speed

6.1 sec in total

First Response

291 ms

Resources Loaded

5.5 sec

Page Rendered

370 ms

lensonline.be screenshot

About Website

Click here to check amazing Lens Online content for Belgium. Otherwise, check out these important facts you probably never knew about lensonline.be

Bestel je contactlenzen bij LensOnline.be aan een voordelige prijs en geniet van een professionele service bij onze opticiens.

Visit lensonline.be

Key Findings

We analyzed Lensonline.be page load time and found that the first response time was 291 ms and then it took 5.8 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

lensonline.be performance score

6

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.4 s

17/100

10%

LCP (Largest Contentful Paint)

Value25.2 s

0/100

25%

SI (Speed Index)

Value8.8 s

15/100

10%

TBT (Total Blocking Time)

Value2,150 ms

6/100

30%

CLS (Cumulative Layout Shift)

Value0.854

4/100

15%

TTI (Time to Interactive)

Value18.2 s

3/100

10%

Network Requests Diagram

lensonline.be

291 ms

lensonline.be

689 ms

www.lensonline.be

291 ms

376 ms

main.css

266 ms

Our browser made a total of 99 requests to load all elements on the main page. We found that 87% of them (86 requests) were addressed to the original Lensonline.be, 2% (2 requests) were made to Stats.g.doubleclick.net and 2% (2 requests) were made to Google.com. The less responsive or slowest element that took the longest time to load (990 ms) belongs to the original domain Lensonline.be.

Page Optimization Overview & Recommendations

Page size can be reduced by 713.2 kB (40%)

Content Size

1.8 MB

After Optimization

1.1 MB

In fact, the total size of Lensonline.be main page is 1.8 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. 45% of websites need less resources to load. Images take 884.7 kB which makes up the majority of the site volume.

HTML Optimization

-84%

Potential reduce by 56.6 kB

  • Original 67.4 kB
  • After minification 59.9 kB
  • After compression 10.8 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 7.5 kB, which is 11% 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 56.6 kB or 84% of the original size.

Image Optimization

-4%

Potential reduce by 33.5 kB

  • Original 884.7 kB
  • After minification 851.2 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. Lens Online images are well optimized though.

JavaScript Optimization

-70%

Potential reduce by 406.7 kB

  • Original 583.6 kB
  • After minification 516.5 kB
  • After compression 177.0 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 406.7 kB or 70% of the original size.

CSS Optimization

-86%

Potential reduce by 216.5 kB

  • Original 252.7 kB
  • After minification 250.2 kB
  • After compression 36.2 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. Lensonline.be needs all CSS files to be minified and compressed as it can save up to 216.5 kB or 86% of the original size.

Requests Breakdown

Number of requests can be reduced by 37 (39%)

Requests Now

94

After Optimization

57

The browser has sent 94 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Lens Online. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 25 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

lensonline.be accessibility score

88

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

Links do not have a discernible name

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

lensonline.be 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

lensonline.be SEO score

97

Search Engine Optimization Advices

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

    NL

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Lensonline.be 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 Lensonline.be 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 description is not detected on the main page of Lens Online. 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: