Tools & Wizards About Us
ou.nl screenshot

Report Summary

  • 20

    Performance

    Renders faster than
    38% of other websites

  • 80

    Accessibility

    Visual factors better than
    that of 50% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 93

    SEO

    Google-friendlier than
    84% of websites

ou.nl

Homepage - Open Universiteit - Open Universiteit

Page Load Speed

4.8 sec in total

First Response

413 ms

Resources Loaded

3.5 sec

Page Rendered

834 ms

ou.nl screenshot

About Website

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

Universitair studeren, zoals jij dat wilt. Van korte studie tot volledige bachelor en master. Persoonlijk en online, prima te combineren met werk en privé.

Visit ou.nl

Key Findings

We analyzed Ou.nl page load time and found that the first response time was 413 ms and then it took 4.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 65% of websites can load faster.

Performance Metrics

ou.nl performance score

20

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.9 s

1/100

10%

LCP (Largest Contentful Paint)

Value16.4 s

0/100

25%

SI (Speed Index)

Value9.9 s

10/100

10%

TBT (Total Blocking Time)

Value1,150 ms

22/100

30%

CLS (Cumulative Layout Shift)

Value0.139

79/100

15%

TTI (Time to Interactive)

Value16.5 s

5/100

10%

Network Requests Diagram

ou.nl

413 ms

www.ou.nl

1065 ms

jquery.min.js

151 ms

css.jsp

126 ms

application.css

232 ms

Our browser made a total of 65 requests to load all elements on the main page. We found that 72% of them (47 requests) were addressed to the original Ou.nl, 5% (3 requests) were made to Stats.g.doubleclick.net and 3% (2 requests) were made to Apis.google.com. The less responsive or slowest element that took the longest time to load (1.1 sec) belongs to the original domain Ou.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 794.2 kB (64%)

Content Size

1.2 MB

After Optimization

444.7 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Ou.nl main page is 1.2 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. 45% of websites need less resources to load. Javascripts take 525.1 kB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 70.2 kB

  • Original 87.5 kB
  • After minification 86.4 kB
  • After compression 17.3 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 70.2 kB or 80% of the original size.

Image Optimization

-13%

Potential reduce by 24.3 kB

  • Original 192.0 kB
  • After minification 167.7 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, Ou needs image optimization as it can save up to 24.3 kB or 13% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-62%

Potential reduce by 327.9 kB

  • Original 525.1 kB
  • After minification 520.0 kB
  • After compression 197.2 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 327.9 kB or 62% of the original size.

CSS Optimization

-86%

Potential reduce by 371.8 kB

  • Original 434.4 kB
  • After minification 432.9 kB
  • After compression 62.6 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. Ou.nl needs all CSS files to be minified and compressed as it can save up to 371.8 kB or 86% of the original size.

Requests Breakdown

Number of requests can be reduced by 31 (55%)

Requests Now

56

After Optimization

25

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 56 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Ou. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 23 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

ou.nl

ou.nl

413 ms

www.ou.nl

www.ou.nl

1065 ms

jquery.min.js

jquery.min.js

151 ms

css.jsp

css.jsp

126 ms

application.css

application.css

232 ms

barebone.jsp

barebone.jsp

502 ms

portal_normal.min.css

portal_normal.min.css

594 ms

cam5tdb.js

cam5tdb.js

115 ms

plusone.js

plusone.js

207 ms

portal_normal.min.js

portal_normal.min.js

410 ms

jquery.M074A.slider.min.js

jquery.M074A.slider.min.js

311 ms

jquery.M086A.min.js

jquery.M086A.min.js

302 ms

rs_embhl_v2_nl_nl.js

rs_embhl_v2_nl_nl.js

323 ms

M003B.min.js

M003B.min.js

393 ms

jquery.M018E.marquee.min.js

jquery.M018E.marquee.min.js

397 ms

jquery.M019E.marquee.min.js

jquery.M019E.marquee.min.js

418 ms

jquery.M019E.ajax.min.js

jquery.M019E.ajax.min.js

486 ms

conversion.js

conversion.js

186 ms

cb=gapi.loaded_0

cb=gapi.loaded_0

32 ms

image_gallery

image_gallery

133 ms

image_gallery

image_gallery

131 ms

image_gallery

image_gallery

132 ms

image_gallery

image_gallery

251 ms

gtm.js

gtm.js

100 ms

sprite_objects_4.png

sprite_objects_4.png

99 ms

sprite_objects_2.png

sprite_objects_2.png

246 ms

M086A_content.png

M086A_content.png

247 ms

M086A_button_states.png

M086A_button_states.png

223 ms

M088A_button_states.png

M088A_button_states.png

223 ms

sprite_objects.png

sprite_objects.png

397 ms

M074B_button.png

M074B_button.png

335 ms

O003B_bg.png

O003B_bg.png

292 ms

O003B_li.png

O003B_li.png

289 ms

O003B_space.png

O003B_space.png

288 ms

image_gallery

image_gallery

398 ms

sprite_O107.png

sprite_O107.png

368 ms

130 ms

dc.js

dc.js

157 ms

analytics.js

analytics.js

194 ms

insight.min.js

insight.min.js

123 ms

431 ms

fbevents.js

fbevents.js

297 ms

131 ms

close_black.png

close_black.png

212 ms

close.png

close.png

217 ms

border1.png

border1.png

288 ms

border2.png

border2.png

297 ms

loading.gif

loading.gif

312 ms

O003B_first.png

O003B_first.png

315 ms

O003B_last.png

O003B_last.png

335 ms

skin_btn_refresh_normal.png

skin_btn_refresh_normal.png

392 ms

skin_btn_refresh_hover.png

skin_btn_refresh_hover.png

393 ms

loader.gif

loader.gif

410 ms

skin_btn_answer_normal.png

skin_btn_answer_normal.png

414 ms

O106A.gif

O106A.gif

435 ms

__utm.gif

__utm.gif

38 ms

collect

collect

20 ms

collect

collect

19 ms

ga-audiences

ga-audiences

22 ms

104 ms

97 ms

122 ms

print.min.css

print.min.css

100 ms

typography_fallback.min.css

typography_fallback.min.css

99 ms

17 ms

Accessibility Review

ou.nl accessibility score

80

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

[id] attributes on active, focusable elements are not unique

Best Practices

ou.nl best practices score

75

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

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

ou.nl SEO score

93

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

Language and Encoding

  • Language Detected

    NL

  • Language Claimed

    N/A

  • Encoding

    UTF-8

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

ou.nl

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