Tools & Wizards About Us
theorie.nl screenshot

Report Summary

  • 16

    Performance

    Renders faster than
    30% of other websites

  • 90

    Accessibility

    Visual factors better than
    that of 74% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 89

    SEO

    Google-friendlier than
    66% of websites

theorie.nl

CBR theorie-examen oefenen en leren (2024) | Theorie.nl

Page Load Speed

2.7 sec in total

First Response

353 ms

Resources Loaded

1.8 sec

Page Rendered

572 ms

theorie.nl screenshot

About Website

Click here to check amazing Theorie content for Netherlands. Otherwise, check out these important facts you probably never knew about theorie.nl

Leer en oefen voor je CBR theorie-examen bij Theorie.nl met onze online videocursus en oefenexamens. Wij helpen kandidaten al sinds 2001 met slagen!

Visit theorie.nl

Key Findings

We analyzed Theorie.nl page load time and found that the first response time was 353 ms and then it took 2.3 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 45% of websites can load faster.

Performance Metrics

theorie.nl performance score

16

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.7 s

60/100

10%

LCP (Largest Contentful Paint)

Value11.6 s

0/100

25%

SI (Speed Index)

Value7.0 s

33/100

10%

TBT (Total Blocking Time)

Value1,770 ms

10/100

30%

CLS (Cumulative Layout Shift)

Value0.493

17/100

15%

TTI (Time to Interactive)

Value13.7 s

10/100

10%

Network Requests Diagram

theorie.nl

353 ms

gtm.js

89 ms

marketing.css

159 ms

icons.svg

237 ms

theorie-nl-logo-blue-subline.svg

322 ms

Our browser made a total of 18 requests to load all elements on the main page. We found that 89% of them (16 requests) were addressed to the original Theorie.nl, 6% (1 request) were made to Googletagmanager.com and 6% (1 request) were made to Maps.googleapis.com. The less responsive or slowest element that took the longest time to load (1.2 sec) belongs to the original domain Theorie.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 75.7 kB (3%)

Content Size

2.7 MB

After Optimization

2.6 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Theorie.nl main page is 2.7 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. 20% of websites need less resources to load. Images take 2.4 MB which makes up the majority of the site volume.

HTML Optimization

-84%

Potential reduce by 49.1 kB

  • Original 58.7 kB
  • After minification 41.9 kB
  • After compression 9.5 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 16.8 kB, which is 29% 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 49.1 kB or 84% of the original size.

Image Optimization

-0%

Potential reduce by 11.4 kB

  • Original 2.4 MB
  • After minification 2.4 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. Theorie images are well optimized though.

JavaScript Optimization

-8%

Potential reduce by 15.2 kB

  • Original 178.5 kB
  • After minification 178.5 kB
  • After compression 163.3 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 30.2 kB
  • After minification 30.2 kB
  • After compression 30.2 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. Theorie.nl has all CSS files already compressed.

Requests Breakdown

We found no issues to fix!

Requests Now

17

After Optimization

17

  • Images
  • JavaScript
  • CSS

The browser has sent 17 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Theorie. According to our analytics all requests are already optimized.

Network Requests Diagram

theorie.nl

theorie.nl

353 ms

gtm.js

gtm.js

89 ms

marketing.css

marketing.css

159 ms

icons.svg

icons.svg

237 ms

theorie-nl-logo-blue-subline.svg

theorie-nl-logo-blue-subline.svg

322 ms

thuiswinkel-small-logo.svg

thuiswinkel-small-logo.svg

411 ms

theorie-nl-logo-lightblue.svg

theorie-nl-logo-lightblue.svg

420 ms

devices-overview-wide-large.png

devices-overview-wide-large.png

865 ms

devices-overview-narrow-large.png

devices-overview-narrow-large.png

990 ms

kiyoh-logo-color.svg

kiyoh-logo-color.svg

413 ms

marketing-min.js

marketing-min.js

399 ms

js

js

85 ms

device-video-auto-large.png

device-video-auto-large.png

794 ms

device-examen-auto-large.png

device-examen-auto-large.png

1215 ms

kiyoh-logo-white-color.svg

kiyoh-logo-white-color.svg

500 ms

instagram.svg

instagram.svg

504 ms

tiktok.svg

tiktok.svg

592 ms

thuiswinkel-logo.svg

thuiswinkel-logo.svg

596 ms

Accessibility Review

theorie.nl accessibility score

90

Accessibility Issues

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

Links do not have a discernible name

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.

Best Practices

theorie.nl best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

theorie.nl SEO score

89

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

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

    NL

  • Encoding

    UTF-8

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

theorie.nl

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