Tools & Wizards About Us
njrs.nl screenshot

Report Summary

  • 100

    Performance

    Renders faster than
    97% of other websites

  • 43

    Accessibility

    Visual factors better than
    that of 19% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 67

    SEO

    Google-friendlier than
    26% of websites

njrs.nl

NJRS - Nederlandse Jeugdvereniging voor Ruimtevaart en Sterrenkunde

Page Load Speed

21.1 sec in total

First Response

624 ms

Resources Loaded

20.3 sec

Page Rendered

132 ms

njrs.nl screenshot

About Website

Welcome to njrs.nl homepage info - get ready to check NJRS best content right away, or after learning these important things about njrs.nl

NJRS Ruimtevaart Sterrenkunde Nederland ruimtevaart nieuws en sterrenkunde nieuws excursies kampen tentoonstellingen waterrakketten jeugd .

Visit njrs.nl

Key Findings

We analyzed Njrs.nl page load time and found that the first response time was 624 ms and then it took 20.4 sec to load all DOM resources and completely render a web page. This is a poor result, as 95% of websites can load faster. Unfortunately, there was 1 request timeout, which can generally increase the web page load time, as the browser stays idle while waiting for website response.

Performance Metrics

njrs.nl performance score

100

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.0 s

100/100

10%

LCP (Largest Contentful Paint)

Value1.0 s

100/100

25%

SI (Speed Index)

Value2.0 s

99/100

10%

TBT (Total Blocking Time)

Value30 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.003

100/100

15%

TTI (Time to Interactive)

Value1.0 s

100/100

10%

Network Requests Diagram

njrs.nl

624 ms

swfobject.js

187 ms

icmc120x60.gif

19575 ms

nav_lidworden.gif

98 ms

nav_lidworden_on.gif

99 ms

Our browser made a total of 44 requests to load all elements on the main page. We found that 98% of them (43 requests) were addressed to the original Njrs.nl, 2% (1 request) were made to Icmc.nl. The less responsive or slowest element that took the longest time to load (19.6 sec) relates to the external source Icmc.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 39.5 kB (21%)

Content Size

186.1 kB

After Optimization

146.6 kB

  • HTML
  • Images
  • JavaScript

In fact, the total size of Njrs.nl main page is 186.1 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. 15% of websites need less resources to load. Images take 164.7 kB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 11.3 kB

  • Original 14.5 kB
  • After minification 13.3 kB
  • After compression 3.2 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 11.3 kB or 78% of the original size.

Image Optimization

-14%

Potential reduce by 23.4 kB

  • Original 164.7 kB
  • After minification 141.3 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, NJRS needs image optimization as it can save up to 23.4 kB or 14% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-69%

Potential reduce by 4.8 kB

  • Original 6.9 kB
  • After minification 6.6 kB
  • After compression 2.1 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 4.8 kB or 69% of the original size.

Requests Breakdown

Number of requests can be reduced by 25 (60%)

Requests Now

42

After Optimization

17

  • AJAX
  • Images
  • JavaScript

The browser has sent 42 CSS, Javascripts, AJAX and image requests in order to completely render the main page of NJRS. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests and as a result speed up the page load time.

Network Requests Diagram

njrs.nl

njrs.nl

624 ms

swfobject.js

swfobject.js

187 ms

icmc120x60.gif

icmc120x60.gif

19575 ms

nav_lidworden.gif

nav_lidworden.gif

98 ms

nav_lidworden_on.gif

nav_lidworden_on.gif

99 ms

nav_astruim.gif

nav_astruim.gif

190 ms

nav_astruim_on.gif

nav_astruim_on.gif

189 ms

nav_activiteiten.gif

nav_activiteiten.gif

190 ms

nav_activiteiten_on.gif

nav_activiteiten_on.gif

192 ms

nav_nieuws.gif

nav_nieuws.gif

194 ms

nav_nieuws_on.gif

nav_nieuws_on.gif

195 ms

nav_themas.gif

nav_themas.gif

286 ms

nav_themas_on.gif

nav_themas_on.gif

285 ms

nav_vraagaanbod.gif

nav_vraagaanbod.gif

287 ms

nav_vraagaanbod_on.gif

nav_vraagaanbod_on.gif

288 ms

nav_links.gif

nav_links.gif

293 ms

nav_links_on.gif

nav_links_on.gif

294 ms

sub_watdoenwe.gif

sub_watdoenwe.gif

384 ms

sub_watdoenwe_on.gif

sub_watdoenwe_on.gif

385 ms

sub_aanmelden.gif

sub_aanmelden.gif

386 ms

sub_aanmelden_on.gif

sub_aanmelden_on.gif

388 ms

verloop.png

verloop.png

576 ms

top_links.gif

top_links.gif

392 ms

top_midden.gif

top_midden.gif

480 ms

top_rechts.gif

top_rechts.gif

481 ms

pixel.gif

pixel.gif

483 ms

nav_line.gif

nav_line.gif

487 ms

titel_lidworden.gif

titel_lidworden.gif

490 ms

foto16.jpg

foto16.jpg

576 ms

foto3.jpg

foto3.jpg

578 ms

foto5.jpg

foto5.jpg

579 ms

foto20.jpg

foto20.jpg

585 ms

foto13.jpg

foto13.jpg

588 ms

tussenbalk.gif

tussenbalk.gif

674 ms

zoek.gif

zoek.gif

672 ms

countdown.gif

countdown.gif

677 ms

deep_fade_links.gif

deep_fade_links.gif

674 ms

deep_fade_rechts.gif

deep_fade_rechts.gif

679 ms

wijzijnerookvoor.gif

wijzijnerookvoor.gif

684 ms

starbgwhite.jpg

starbgwhite.jpg

675 ms

ookvoor_menu.gif

ookvoor_menu.gif

678 ms

njrs.nl

njrs.nl

599 ms

njrs.nl

njrs.nl

604 ms

njrs.nl

njrs.nl

602 ms

Accessibility Review

njrs.nl accessibility score

43

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.

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

Image elements do not have [alt] attributes

High

Form elements do not have associated labels

High

Links do not have a discernible name

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

Best Practices

njrs.nl best practices score

58

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

njrs.nl SEO score

67

Search Engine Optimization Advices

Content Best Practices

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

Impact

Issue

High

Image elements do not have [alt] attributes

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 Njrs.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 Njrs.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

njrs.nl

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