Access recensies.infonu.nl. InfoNu - Een Online Bibliotheek met Informatie van A tot Z

name

value

score

weighting

FCP (First Contentful Paint)

Value3.5 s

33/100

10%

LCP (Largest Contentful Paint)

Value3.6 s

60/100

25%

SI (Speed Index)

Value4.3 s

75/100

10%

TBT (Total Blocking Time)

Value140 ms

96/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value6.4 s

60/100

10%

recensies.infonu.nl

821 ms

style_small-v43.css

507 ms

style_large-v43.css

511 ms

jquery.min.js

28 ms

adv_v55.js

504 ms

Our browser made a total of 40 requests to load all elements on the main page. We found that 80% of them (32 requests) were addressed to the original Recensies.infonu.nl, 13% (5 requests) were made to Infonu.nl and 5% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (821 ms) belongs to the original domain Recensies.infonu.nl.

Content Size

376.3 kB

After Optimization

296.6 kB

In fact, the total size of Recensies.infonu.nl main page is 376.3 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. 30% of websites need less resources to load. Images take 252.3 kB which makes up the majority of the site volume.

HTML Optimization

-73%

Potential reduce by 33.5 kB

Original 45.7 kB
After minification 45.7 kB
After compression 12.2 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 33.5 kB or 73% of the original size.

Image Optimization

-12%

Potential reduce by 29.5 kB

Original 252.3 kB
After minification 222.8 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, Recensies Info Nu needs image optimization as it can save up to 29.5 kB or 12% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-21%

Potential reduce by 16.8 kB

Original 78.3 kB
After minification 76.0 kB
After compression 61.6 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 16.8 kB or 21% of the original size.

Requests Now

After Optimization

The browser has sent 39 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Recensies Info Nu. 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 as a result speed up the page load time.

Accessibility Issues

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 the interpretation of your content by users in different locales.

High

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

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

robots.txt is not valid

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

N/A
Encoding

ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Recensies.infonu.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 Recensies.infonu.nl main page’s claimed encoding is iso-8859-1. 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

recensies.infonu.nl

Open Graph description is not detected on the main page of Recensies Info Nu. 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

InfoNu - Een Online Bibliotheek met Informatie van A tot Z

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

recensies.infonu.nl

style_small-v43.css

style_large-v43.css

jquery.min.js

adv_v55.js

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

recensies.infonu.nl

style_small-v43.css

style_large-v43.css

jquery.min.js

adv_v55.js

standaard-v43.js

330-auto-kopen-of-verkopen-via-autotracknl.jpg

sprites.png

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ad2.png

analytics.js

collect

Accessibility Review

Accessibility Issues

Best Practices

Areas of Improvement