Access boeken.vpro.nl. VPRO Boeken

Report Summary

name

value

score

weighting

FCP (First Contentful Paint)

Value3.5 s

34/100

10%

LCP (Largest Contentful Paint)

Value11.5 s

0/100

25%

SI (Speed Index)

Value8.4 s

19/100

10%

TBT (Total Blocking Time)

Value3,080 ms

2/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value10.9 s

21/100

10%

boeken.vpro.nl

381 ms

boeken.html

509 ms

style_new.css

284 ms

piano-analytics.js

20 ms

tag.min.js

124 ms

Our browser made a total of 25 requests to load all elements on the main page. We found that 4% of them (1 request) were addressed to the original Boeken.vpro.nl, 76% (19 requests) were made to Vpro.nl and 8% (2 requests) were made to Ccm.npo.nl. The less responsive or slowest element that took the longest time to load (509 ms) relates to the external source Vpro.nl.

Content Size

55.4 kB

After Optimization

22.9 kB

In fact, the total size of Boeken.vpro.nl main page is 55.4 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 25% of websites need less resources to load. HTML takes 44.1 kB which makes up the majority of the site volume.

HTML Optimization

-73%

Potential reduce by 32.4 kB

Original 44.1 kB
After minification 42.6 kB
After compression 11.7 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 32.4 kB or 73% of the original size.

JavaScript Optimization

-1%

Potential reduce by 85 B

Original 11.3 kB
After minification 11.3 kB
After compression 11.2 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.

Requests Now

After Optimization

The browser has sent 23 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Boeken VPRO. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 11 to 1 for JavaScripts and as a result speed up the page load time.

Accessibility Issues

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

Links do not have a discernible name

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

High

List items (<li>) are not contained within <ul> or <ol> parent elements.

These items highlight common accessibility best practices.

High

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

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

Low

Detected JavaScript libraries

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

NL
Encoding

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Boeken.vpro.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 Boeken.vpro.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

Open Graph data is detected on the main page of Boeken VPRO. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: