Access atagverwarming.nl. Warmtepompen & CV-ketels | Kies jouw duurzame oplossing voor verwarmen en warm water

name

value

score

weighting

FCP (First Contentful Paint)

Value4.8 s

12/100

10%

LCP (Largest Contentful Paint)

Value70.3 s

0/100

25%

SI (Speed Index)

Value11.1 s

6/100

10%

TBT (Total Blocking Time)

Value7,380 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.161

73/100

15%

TTI (Time to Interactive)

Value70.2 s

0/100

10%

home

316 ms

default.css

114 ms

dyncss.css

161 ms

AxendoFormDesigner.css

173 ms

jquery-1.9.1.min.js

449 ms

Our browser made a total of 77 requests to load all elements on the main page. We found that 74% of them (57 requests) were addressed to the original Atagverwarming.nl, 6% (5 requests) were made to Google-analytics.com and 4% (3 requests) were made to Google.com. The less responsive or slowest element that took the longest time to load (646 ms) belongs to the original domain Atagverwarming.nl.

Content Size

2.0 MB

After Optimization

1.2 MB

In fact, the total size of Atagverwarming.nl main page is 2.0 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. 50% of websites need less resources to load. Images take 1.0 MB which makes up the majority of the site volume.

HTML Optimization

-75%

Potential reduce by 25.5 kB

Original 33.8 kB
After minification 29.2 kB
After compression 8.3 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 4.6 kB, which is 14% 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 25.5 kB or 75% of the original size.

Image Optimization

-7%

Potential reduce by 70.4 kB

Original 1.0 MB
After minification 953.3 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. ATAG Verwarming images are well optimized though.

JavaScript Optimization

-63%

Potential reduce by 367.2 kB

Original 583.3 kB
After minification 548.0 kB
After compression 216.1 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 367.2 kB or 63% of the original size.

CSS Optimization

-83%

Potential reduce by 280.4 kB

Original 338.4 kB
After minification 319.3 kB
After compression 58.0 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. Atagverwarming.nl needs all CSS files to be minified and compressed as it can save up to 280.4 kB or 83% of the original size.

Requests Now

After Optimization

The browser has sent 71 CSS, Javascripts, AJAX and image requests in order to completely render the main page of ATAG Verwarming. 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 9 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

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.

High

[aria-*] attributes do not match their roles

High

[aria-hidden="true"] elements contain focusable descendents

High

ARIA input fields do not have accessible names

High

Elements with an ARIA [role] that require children to contain a specific [role] are missing some or all of those required children.

High

ARIA toggle fields do not have accessible names

High

[aria-*] attributes do not have valid values

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

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.

High

Form elements do not have associated labels

High

Links do not have a discernible name

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

High

Displays images with incorrect aspect ratio

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

Search Engine Optimization Advices

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/).

High

Document uses legible font sizes

Language and Encoding

Language Detected

NL
Language Claimed

N/A
Encoding

ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Atagverwarming.nl can be misinterpreted by Google and other search engines. Our service has detected that Dutch is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Atagverwarming.nl main page’s claimed encoding is iso-8859-1. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

atagverwarming.nl

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

Report Summary

Performance

Accessibility

Best Practices

SEO

Warmtepompen & CV-ketels | Kies jouw duurzame oplossing voor verwarmen en warm water | ATAG Verwarming

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

home

default.css

dyncss.css

AxendoFormDesigner.css

jquery-1.9.1.min.js

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

home

default.css

dyncss.css

AxendoFormDesigner.css

jquery-1.9.1.min.js

flashobject.js

productwizard.js

global.js

highslide-with-html.packed.js

highslide.config.js

widgets.js

highslide.css

WebResource.axd

prototype.ashx

core.ashx

converter.ashx

AtagSite.usercontrols.productwizardpanel,AtagSite.ashx

WebResource.axd

conversion.js

ga.js

bgMain.jpg

logoatag.gif

homebanner_atag.png

info.gif

combi_cv_ketel.jpg

ketel_aparte_boiler.jpg

cv_verwarming.jpg

zonnesysteem.jpg

one-vrijst-20.5-schdw.jpg

main.aspx

__utm.gif

roundedButton.png

arrow_nextbtn.gif

stat.aspx

bmstats.js

normalize.css

fonts.css

atag.css

modernizr-2.6.2.min.js

jquery-1.9.1.min.js

jquery.event.drag-2.2.js

jquery.roundabout.min.js

jquery.scroller.js