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name

value

score

weighting

FCP (First Contentful Paint)

Value2.8 s

56/100

10%

LCP (Largest Contentful Paint)

Value8.1 s

2/100

25%

SI (Speed Index)

Value4.2 s

77/100

10%

TBT (Total Blocking Time)

Value680 ms

44/100

30%

CLS (Cumulative Layout Shift)

Value0.119

85/100

15%

TTI (Time to Interactive)

Value7.6 s

46/100

10%

groenhorstcollege.nl

283 ms

Our browser made a total of 1 request to load all elements on the main page. We found that all of those requests were addressed to Groenhorstcollege.nl and no external sources were called. The less responsive or slowest element that took the longest time to load (283 ms) belongs to the original domain Groenhorstcollege.nl.

Content Size

1.4 MB

After Optimization

601.9 kB

In fact, the total size of Groenhorstcollege.nl main page is 1.4 MB. This result falls within the top 5000 of lightweight and thus fast loading web pages. Only a small number of websites need less resources to load. Javascripts take 855.8 kB which makes up the majority of the site volume.

HTML Optimization

-16%

Potential reduce by 19 B

Original 116 B
After minification 110 B
After compression 97 B

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 19 B or 16% of the original size.

Image Optimization

-9%

Potential reduce by 27.1 kB

Original 316.1 kB
After minification 288.9 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. Groenhorstcollege images are well optimized though.

JavaScript Optimization

-67%

Potential reduce by 574.9 kB

Original 855.8 kB
After minification 843.5 kB
After compression 280.9 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 574.9 kB or 67% of the original size.

CSS Optimization

-84%

Potential reduce by 167.7 kB

Original 199.7 kB
After minification 199.5 kB
After compression 32.0 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. Groenhorstcollege.nl needs all CSS files to be minified and compressed as it can save up to 167.7 kB or 84% of the original size.

Requests Now

After Optimization

Besides the initial HTML request, no CSS, Javascripts, AJAX or image files were requested in the course of web page rendering.

Accessibility Issues

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

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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

To appear in search results, crawlers need access to your app.

High

Links are not crawlable

Format your HTML in a way that enables crawlers to better understand your app’s content.

High

Image elements do not have [alt] attributes

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

N/A
Encoding

N/A

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Groenhorstcollege.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 Groenhorstcollege.nl main page’s claimed encoding is . Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

groenhorstcollege.nl

Open Graph description is not detected on the main page of Groenhorstcollege. 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: