Access willemblaeu.nl. OSG Willem Blaeu: vmbo, mavo, havo, atheneum & gymnasium

name

value

score

weighting

FCP (First Contentful Paint)

Value5.0 s

9/100

10%

LCP (Largest Contentful Paint)

Value10.9 s

0/100

25%

SI (Speed Index)

Value12.9 s

2/100

10%

TBT (Total Blocking Time)

Value3,840 ms

1/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value31.1 s

0/100

10%

willemblaeu.nl

406 ms

www.willemblaeu.nl

1410 ms

app.css

469 ms

style.min.css

552 ms

safe-svg-block-frontend.css

281 ms

Our browser made a total of 77 requests to load all elements on the main page. We found that 83% of them (64 requests) were addressed to the original Willemblaeu.nl, 5% (4 requests) were made to Google.com and 5% (4 requests) were made to Use.typekit.net. The less responsive or slowest element that took the longest time to load (1.4 sec) belongs to the original domain Willemblaeu.nl.

Content Size

6.3 MB

After Optimization

4.8 MB

In fact, the total size of Willemblaeu.nl main page is 6.3 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. 60% of websites need less resources to load. Images take 4.2 MB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 53.1 kB

Original 66.4 kB
After minification 59.3 kB
After compression 13.3 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 7.1 kB, which is 11% 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 53.1 kB or 80% of the original size.

Image Optimization

-0%

Potential reduce by 6.5 kB

Original 4.2 MB
After minification 4.2 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. Willem Blaeu images are well optimized though.

JavaScript Optimization

-66%

Potential reduce by 984.8 kB

Original 1.5 MB
After minification 1.5 MB
After compression 502.1 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 984.8 kB or 66% of the original size.

CSS Optimization

-81%

Potential reduce by 381.0 kB

Original 468.7 kB
After minification 468.5 kB
After compression 87.7 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. Willemblaeu.nl needs all CSS files to be minified and compressed as it can save up to 381.0 kB or 81% of the original size.

Requests Now

After Optimization

The browser has sent 72 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Willem Blaeu. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 22 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

[role]s are not contained by their required parent element

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

Buttons do not have an accessible name

High

Links do not have a discernible name

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 keyboard navigation in your application.

High

Heading elements are not in a sequentially-descending order

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

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

Areas of Improvement

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

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

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 Willemblaeu.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 Willemblaeu.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

willemblaeu.nl

Open Graph description is not detected on the main page of Willem Blaeu. 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

OSG Willem Blaeu: vmbo, mavo, havo, atheneum & gymnasium - O.S.G. Willem Blaeu

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

willemblaeu.nl

www.willemblaeu.nl

app.css

style.min.css

safe-svg-block-frontend.css

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

willemblaeu.nl

www.willemblaeu.nl

app.css

style.min.css

safe-svg-block-frontend.css

jquery.min.js

jquery-migrate.min.js

app.js

basic.min.css

theme-ie11.min.css

theme.min.css

api.js

wp-polyfill-inert.min.js

regenerator-runtime.min.js

wp-polyfill.min.js

dom-ready.min.js

hooks.min.js

i18n.min.js

a11y.min.js

jquery.json.min.js

gravityforms.min.js

placeholders.jquery.min.js

utils.min.js

vendor-theme.min.js

scripts-theme.min.js

frontend.min.js

azi8ijn.css

p.css

logo-shape.svg

logo.svg

icon-search.svg

icon-user.svg

icon-hamburger.svg

shape-submenu.svg

icon-close.svg

icon-search-black.svg

header-img-1800x900-1-1800x900.jpg

groep-8-header-1800x900.jpg

shape-smaller.svg

shape-bg.svg

Willem-Bleau-105-800x1200.jpg

cycle-lach-800x1200.jpg

BWP2661-800x1200.jpg