Access ivm.vu.nl. Instituut voor Milieuvraagstukken (IVM)

Report Summary

About Website

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

Het Instituut voor Milieuvraagstukken (IVM) is een interdisciplinair instituut van de VU en is verbonden aan de Faculteit der Bètawetenschappen.

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name

value

score

weighting

FCP (First Contentful Paint)

Value5.6 s

5/100

10%

LCP (Largest Contentful Paint)

Value21.9 s

0/100

25%

SI (Speed Index)

Value13.2 s

2/100

10%

TBT (Total Blocking Time)

Value300 ms

79/100

30%

CLS (Cumulative Layout Shift)

Value0.046

99/100

15%

TTI (Time to Interactive)

Value27.5 s

0/100

10%

ivm.vu.nl

533 ms

ivm

622 ms

site.min.css

722 ms

VU-logo-nobg.svg

200 ms

josh-appel-NeTPASr-bmQ-unsplash.jpg

772 ms

Our browser made a total of 24 requests to load all elements on the main page. We found that 4% of them (1 request) were addressed to the original Ivm.vu.nl, 71% (17 requests) were made to Vu.nl and 25% (6 requests) were made to Assets.vu.nl. The less responsive or slowest element that took the longest time to load (1 sec) relates to the external source Assets.vu.nl.

Content Size

3.7 MB

After Optimization

3.7 MB

In fact, the total size of Ivm.vu.nl main page is 3.7 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. 55% of websites need less resources to load. Images take 3.7 MB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 50.7 kB

Original 60.7 kB
After minification 46.5 kB
After compression 10.1 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 14.3 kB, which is 23% 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 50.7 kB or 83% of the original size.

Image Optimization

-0%

Potential reduce by 0 B

Original 3.7 MB
After minification 3.7 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. IVM Vu images are well optimized though.

JavaScript Optimization

-36%

Potential reduce by 156 B

Original 438 B
After minification 438 B
After compression 282 B

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 156 B or 36% of the original size.

CSS Optimization

-40%

Potential reduce by 59 B

Original 146 B
After minification 132 B
After compression 87 B

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. Ivm.vu.nl needs all CSS files to be minified and compressed as it can save up to 59 B or 40% of the original size.

Requests Now

After Optimization

The browser has sent 12 CSS, Javascripts, AJAX and image requests in order to completely render the main page of IVM Vu. According to our analytics all requests are already optimized.

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

[aria-*] attributes do not match their roles

High

[aria-hidden="true"] elements contain focusable descendents

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

Image elements do not have [alt] attributes

Areas of Improvement

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

Search Engine Optimization Advices

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

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 Ivm.vu.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 Ivm.vu.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

ivm.vu.nl

Open Graph data is detected on the main page of IVM Vu. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook:

Report Summary

Performance

Accessibility

Best Practices

SEO

Instituut voor Milieuvraagstukken (IVM) - Vrije Universiteit Amsterdam

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)