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Report Summary

About Website

Welcome to slo.nl homepage info - get ready to check SLO best content for Netherlands right away, or after learning these important things about slo.nl

In opdracht van de samenleving ontwikkelt SLO samen met het onderwijsveld de doelen, kaders en instrumenten waarmee scholen hun opdracht vanuit een eigen visie kunnen vervullen.

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name

value

score

weighting

FCP (First Contentful Paint)

Value3.1 s

48/100

10%

LCP (Largest Contentful Paint)

Value14.2 s

0/100

25%

SI (Speed Index)

Value7.4 s

27/100

10%

TBT (Total Blocking Time)

Value370 ms

71/100

30%

CLS (Cumulative Layout Shift)

Value0.004

100/100

15%

TTI (Time to Interactive)

Value13.6 s

11/100

10%

slo.nl

1948 ms

www.slo.nl

930 ms

layout.css

174 ms

scripts.js

849 ms

addthis_widget.js

9 ms

Our browser made a total of 56 requests to load all elements on the main page. We found that 45% of them (25 requests) were addressed to the original Slo.nl, 13% (7 requests) were made to Apis.google.com and 7% (4 requests) were made to Platform.twitter.com. The less responsive or slowest element that took the longest time to load (1.9 sec) belongs to the original domain Slo.nl.

Content Size

711.2 kB

After Optimization

317.6 kB

In fact, the total size of Slo.nl main page is 711.2 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. 50% of websites need less resources to load. Javascripts take 425.1 kB which makes up the majority of the site volume.

HTML Optimization

-70%

Potential reduce by 53.0 kB

Original 75.6 kB
After minification 75.4 kB
After compression 22.7 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 53.0 kB or 70% of the original size.

Image Optimization

-17%

Potential reduce by 27.8 kB

Original 162.2 kB
After minification 134.4 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, SLO needs image optimization as it can save up to 27.8 kB or 17% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-64%

Potential reduce by 271.4 kB

Original 425.1 kB
After minification 425.1 kB
After compression 153.7 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 271.4 kB or 64% of the original size.

CSS Optimization

-86%

Potential reduce by 41.4 kB

Original 48.2 kB
After minification 37.2 kB
After compression 6.8 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. Slo.nl needs all CSS files to be minified and compressed as it can save up to 41.4 kB or 86% of the original size.

Requests Now

After Optimization

The browser has sent 48 CSS, Javascripts, AJAX and image requests in order to completely render the main page of SLO. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 17 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

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

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 Slo.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 Slo.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

slo.nl

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

Home - SLO

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)