Report Summary

  • 28

    Performance

    Renders faster than
    48% of other websites

  • 89

    Accessibility

    Visual factors better than
    that of 72% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 84

    SEO

    Google-friendlier than
    53% of websites

instruct-online.nl

Instruct Educatieve Uitgeverij - voor po, vo en mbo

Page Load Speed

1.5 sec in total

First Response

266 ms

Resources Loaded

1.1 sec

Page Rendered

130 ms

instruct-online.nl screenshot

About Website

Visit instruct-online.nl now to see the best up-to-date Instruct Online content for Netherlands and also check out these interesting facts you probably never knew about instruct-online.nl

Instruct is meer dan een uitgeverij. Wij zijn een betrouwbare, betrokken partner in educatie. Voor basisonderwijs, voortgezet onderwijs en mbo.

Visit instruct-online.nl

Key Findings

We analyzed Instruct-online.nl page load time and found that the first response time was 266 ms and then it took 1.2 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 25% of websites can load faster.

Performance Metrics

instruct-online.nl performance score

28

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.2 s

19/100

10%

LCP (Largest Contentful Paint)

Value17.4 s

0/100

25%

SI (Speed Index)

Value7.2 s

29/100

10%

TBT (Total Blocking Time)

Value1,140 ms

22/100

30%

CLS (Cumulative Layout Shift)

Value0.019

100/100

15%

TTI (Time to Interactive)

Value12.5 s

14/100

10%

Network Requests Diagram

instruct-online.nl

266 ms

global.css.php

269 ms

content.css.php

361 ms

arial.css

477 ms

jquery_v1.4.2.js

393 ms

Our browser made a total of 23 requests to load all elements on the main page. We found that 52% of them (12 requests) were addressed to the original Instruct-online.nl, 39% (9 requests) were made to Instruct.instruct-online.nl and 9% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (477 ms) relates to the external source Instruct.instruct-online.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 239.5 kB (73%)

Content Size

328.2 kB

After Optimization

88.7 kB

In fact, the total size of Instruct-online.nl main page is 328.2 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. 20% of websites need less resources to load. Javascripts take 259.5 kB which makes up the majority of the site volume.

HTML Optimization

-73%

Potential reduce by 6.2 kB

  • Original 8.4 kB
  • After minification 6.9 kB
  • After compression 2.3 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 1.5 kB, which is 18% 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 6.2 kB or 73% of the original size.

Image Optimization

-21%

Potential reduce by 6.2 kB

  • Original 29.3 kB
  • After minification 23.1 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, Instruct Online needs image optimization as it can save up to 6.2 kB or 21% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-78%

Potential reduce by 201.9 kB

  • Original 259.5 kB
  • After minification 183.9 kB
  • After compression 57.6 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 201.9 kB or 78% of the original size.

CSS Optimization

-81%

Potential reduce by 25.2 kB

  • Original 31.0 kB
  • After minification 24.2 kB
  • After compression 5.8 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. Instruct-online.nl needs all CSS files to be minified and compressed as it can save up to 25.2 kB or 81% of the original size.

Requests Breakdown

Number of requests can be reduced by 6 (27%)

Requests Now

22

After Optimization

16

The browser has sent 22 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Instruct Online. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 4 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

instruct-online.nl accessibility score

89

Accessibility Issues

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

Heading elements are not in a sequentially-descending order

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

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

Links do not have a discernible name

Best Practices

instruct-online.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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

instruct-online.nl SEO score

84

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

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Instruct-online.nl can be misinterpreted by Google and other search engines. Our service has detected that Dutch is used on the page, and it does not match the claimed English language. Our system also found out that Instruct-online.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

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