Tools & Wizards About Us
rensa.nl screenshot

Report Summary

  • 15

    Performance

    Renders faster than
    27% of other websites

  • 70

    Accessibility

    Visual factors better than
    that of 35% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 86

    SEO

    Google-friendlier than
    60% of websites

rensa.nl

De groothandel voor cv-ketel, warmtepomp en PV | Rensa

Page Load Speed

3.6 sec in total

First Response

258 ms

Resources Loaded

2.6 sec

Page Rendered

727 ms

rensa.nl screenshot

About Website

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

300.000+ producten voor verwarming, ventilatie, duurzame installaties en onderdelen | Alles voor cv-ketel, warmtepomp en PV | Voor 18.00 uur besteld = volgende werkdag geleverd

Visit rensa.nl

Key Findings

We analyzed Rensa.nl page load time and found that the first response time was 258 ms and then it took 3.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.

Performance Metrics

rensa.nl performance score

15

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.4 s

39/100

10%

LCP (Largest Contentful Paint)

Value34.8 s

0/100

25%

SI (Speed Index)

Value13.8 s

1/100

10%

TBT (Total Blocking Time)

Value4,440 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.168

71/100

15%

TTI (Time to Interactive)

Value35.7 s

0/100

10%

Network Requests Diagram

rensa.nl

258 ms

rensa.nl

480 ms

gtm.js

76 ms

styles1.css

426 ms

global.min.css

340 ms

Our browser made a total of 47 requests to load all elements on the main page. We found that 60% of them (28 requests) were addressed to the original Rensa.nl, 11% (5 requests) were made to Youtube.com and 4% (2 requests) were made to App.usercentrics.eu. The less responsive or slowest element that took the longest time to load (1.4 sec) belongs to the original domain Rensa.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.2 MB (25%)

Content Size

4.7 MB

After Optimization

3.5 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Rensa.nl main page is 4.7 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. 80% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 4.1 MB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 84.9 kB

  • Original 106.2 kB
  • After minification 96.0 kB
  • After compression 21.3 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. 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 84.9 kB or 80% of the original size.

Image Optimization

-27%

Potential reduce by 1.1 MB

  • Original 4.1 MB
  • After minification 3.0 MB

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, Rensa needs image optimization as it can save up to 1.1 MB or 27% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-1%

Potential reduce by 2.9 kB

  • Original 447.3 kB
  • After minification 447.3 kB
  • After compression 444.4 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

-0%

Potential reduce by 0 B

  • Original 59.4 kB
  • After minification 59.4 kB
  • After compression 59.4 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. Rensa.nl has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 15 (41%)

Requests Now

37

After Optimization

22

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 37 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Rensa. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 16 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

rensa.nl

rensa.nl

258 ms

rensa.nl

rensa.nl

480 ms

gtm.js

gtm.js

76 ms

styles1.css

styles1.css

426 ms

global.min.css

global.min.css

340 ms

loader.js

loader.js

26 ms

copypastesubscribeformlogic.js

copypastesubscribeformlogic.js

25 ms

bodyend1.js

bodyend1.js

1138 ms

global.min.js

global.min.js

463 ms

js

js

70 ms

richmarker.min.js

richmarker.min.js

463 ms

angular-locale_nl-nl.js

angular-locale_nl-nl.js

462 ms

nl_nl.js

nl_nl.js

463 ms

Rensa_Logo_PNG.png

Rensa_Logo_PNG.png

106 ms

topbanner_donkergroen-4sterren.png

topbanner_donkergroen-4sterren.png

633 ms

icon_tips_midblue.png

icon_tips_midblue.png

116 ms

icon_nieuws_midblue.png

icon_nieuws_midblue.png

104 ms

0724_Zehnder_Nieuw.jpg

0724_Zehnder_Nieuw.jpg

634 ms

0624_geberit.jpg

0624_geberit.jpg

636 ms

0624_Henco.jpg

0624_Henco.jpg

633 ms

play_icon.png

play_icon.png

255 ms

0724_Burgerhout.png

0724_Burgerhout.png

1447 ms

footer_2023.png

footer_2023.png

634 ms

Part%20of%20the%20Rensa%20family%20DIAP.png

Part%20of%20the%20Rensa%20family%20DIAP.png

634 ms

bundle.js

bundle.js

27 ms

OpenSans-Regular.woff

OpenSans-Regular.woff

602 ms

OpenSans-Semibold.woff

OpenSans-Semibold.woff

642 ms

OpenSans-ExtraBold.woff

OpenSans-ExtraBold.woff

642 ms

OpenSans-Bold.woff

OpenSans-Bold.woff

593 ms

qozsqZnPB6s

qozsqZnPB6s

130 ms

Homepagebanner_epd-3.png

Homepagebanner_epd-3.png

1071 ms

0324_Banner%20916x560.png

0324_Banner%20916x560.png

870 ms

montserrat-v14-latin-600.woff

montserrat-v14-latin-600.woff

703 ms

montserrat-v14-latin-700.woff

montserrat-v14-latin-700.woff

702 ms

www-player.css

www-player.css

7 ms

www-embed-player.js

www-embed-player.js

38 ms

base.js

base.js

79 ms

ad_status.js

ad_status.js

283 ms

SclmollydWJfU3KlFyu6E8_NsFw37tKJuv7lrmV-iyA.js

SclmollydWJfU3KlFyu6E8_NsFw37tKJuv7lrmV-iyA.js

249 ms

embed.js

embed.js

152 ms

KFOlCnqEu92Fr1MmEU9fBBc9.ttf

KFOlCnqEu92Fr1MmEU9fBBc9.ttf

126 ms

KFOmCnqEu92Fr1Mu4mxP.ttf

KFOmCnqEu92Fr1Mu4mxP.ttf

128 ms

insight.min.js

insight.min.js

84 ms

id

id

62 ms

Create

Create

126 ms

insight_tag_errors.gif

insight_tag_errors.gif

204 ms

GenerateIT

GenerateIT

15 ms

Accessibility Review

rensa.nl accessibility score

70

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

[role] values are not valid

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

Buttons do not have an accessible name

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

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

rensa.nl best practices score

58

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

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

rensa.nl SEO score

86

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

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

    NL

  • Language Claimed

    NL

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Rensa.nl can be misinterpreted by Google and other search engines. Our service has detected that Dutch is used on the page, and it matches the claimed language. Our system also found out that Rensa.nl 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

rensa.nl

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