232 ms in total
20 ms
212 ms
0 ms
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Visit zelf.nlWe analyzed Zelf.nl page load time and found that the first response time was 20 ms and then it took 212 ms to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster.
zelf.nl performance score
name
value
score
weighting
Value2.3 s
75/100
10%
Value2.3 s
92/100
25%
Value2.3 s
99/100
10%
Value590 ms
51/100
30%
Value0
100/100
15%
Value8.0 s
43/100
10%
20 ms
60 ms
79 ms
111 ms
55 ms
Our browser made a total of 17 requests to load all elements on the main page. We found that 47% of them (8 requests) were addressed to the original Zelf.nl, 41% (7 requests) were made to Images.ctfassets.net and 6% (1 request) were made to Diffuser-cdn.app-us1.com. The less responsive or slowest element that took the longest time to load (111 ms) relates to the external source Googletagmanager.com.
Page size can be reduced by 424.2 kB (22%)
2.0 MB
1.5 MB
In fact, the total size of Zelf.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. 55% of websites need less resources to load. Images take 1.6 MB which makes up the majority of the site volume.
Potential reduce by 106.6 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 106.6 kB or 81% of the original size.
Potential reduce by 316.7 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. Obviously, Zelf needs image optimization as it can save up to 316.7 kB or 20% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 926 B
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.
Number of requests can be reduced by 7 (47%)
15
8
The browser has sent 15 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Zelf. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 8 to 1 for JavaScripts and as a result speed up the page load time.
zelf.nl
20 ms
zelf.nl
60 ms
diffuser.js
79 ms
gtm.js
111 ms
Nurse_and_Business_man_0.5x.png
55 ms
polyfill-001d4466472719cb5942.js
21 ms
component---src-templates-general-page-tsx-723fae7efc5c575d6b97.js
28 ms
fbc3711b9123e0dae3038409a3fbae72f723ac5e-b5e3a12d9fabb1a092f5.js
62 ms
app-7f639c1c6e715ca56795.js
44 ms
framework-9409b4a1577045c0a56f.js
31 ms
webpack-runtime-553617572bad931793cd.js
30 ms
juridisch_document-min__1_.png
64 ms
Image__2_.svg
51 ms
about.jpeg
61 ms
abnamro-logo.png
59 ms
perfectday.png
61 ms
logo_rompslomp.png
61 ms
zelf.nl accessibility score
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
Buttons do not have an accessible name
Image elements do not have [alt] attributes
Links do not have a discernible name
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
[id] attributes on active, focusable elements are not unique
Heading elements are not in a sequentially-descending order
zelf.nl best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
Page has valid source maps
zelf.nl SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
robots.txt is not valid
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
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
Document uses legible font sizes
NL
NL
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Zelf.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 Zelf.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.
zelf.nl
Open Graph data is detected on the main page of Zelf. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: