Tools & Wizards About Us
liacs.leidenuniv.nl screenshot

Report Summary

  • 45

    Performance

    Renders faster than
    64% of other websites

  • 77

    Accessibility

    Visual factors better than
    that of 44% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 99

    SEO

    Google-friendlier than
    93% of websites

liacs.leidenuniv.nl

Computer Science at Leiden University - Leiden University

Page Load Speed

3.9 sec in total

First Response

646 ms

Resources Loaded

2.9 sec

Page Rendered

383 ms

liacs.leidenuniv.nl screenshot

About Website

Welcome to liacs.leidenuniv.nl homepage info - get ready to check Liacs Leiden Univ best content for Netherlands right away, or after learning these important things about liacs.leidenuniv.nl

LIACS is the Computer Science institute of Leiden University, offering various bachelor- and master degree programmes

Visit liacs.leidenuniv.nl

Key Findings

We analyzed Liacs.leidenuniv.nl page load time and found that the first response time was 646 ms and then it took 3.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.

Performance Metrics

liacs.leidenuniv.nl performance score

45

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.3 s

40/100

10%

LCP (Largest Contentful Paint)

Value4.0 s

50/100

25%

SI (Speed Index)

Value4.1 s

79/100

10%

TBT (Total Blocking Time)

Value520 ms

57/100

30%

CLS (Cumulative Layout Shift)

Value0.602

10/100

15%

TTI (Time to Interactive)

Value11.0 s

21/100

10%

Network Requests Diagram

liacs.leidenuniv.nl

646 ms

liacs.leidenuniv.nl

481 ms

screen.css

688 ms

js

77 ms

ul2.js

401 ms

Our browser made a total of 43 requests to load all elements on the main page. We found that 12% of them (5 requests) were addressed to the original Liacs.leidenuniv.nl, 84% (36 requests) were made to Universiteitleiden.nl and 5% (2 requests) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (1.1 sec) relates to the external source Universiteitleiden.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 37.8 kB (56%)

Content Size

67.4 kB

After Optimization

29.7 kB

  • HTML
  • JavaScript

In fact, the total size of Liacs.leidenuniv.nl main page is 67.4 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. 35% of websites need less resources to load. HTML takes 46.4 kB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 37.7 kB

  • Original 46.4 kB
  • After minification 36.5 kB
  • After compression 8.7 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. This page needs HTML code to be minified as it can gain 9.9 kB, which is 21% 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 37.7 kB or 81% of the original size.

JavaScript Optimization

-0%

Potential reduce by 50 B

  • Original 21.0 kB
  • After minification 21.0 kB
  • After compression 20.9 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. This website has mostly compressed JavaScripts.

Requests Breakdown

Number of requests can be reduced by 11 (31%)

Requests Now

35

After Optimization

24

  • Images
  • JavaScript
  • CSS

The browser has sent 35 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Liacs Leiden Univ. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 12 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

liacs.leidenuniv.nl

liacs.leidenuniv.nl

646 ms

liacs.leidenuniv.nl

liacs.leidenuniv.nl

481 ms

screen.css

screen.css

688 ms

js

js

77 ms

ul2.js

ul2.js

401 ms

gtm.js

gtm.js

158 ms

zegel.png

zegel.png

158 ms

d1180x250

d1180x250

417 ms

d50x50

d50x50

193 ms

d50x50

d50x50

297 ms

d50x50

d50x50

332 ms

d50x50

d50x50

311 ms

d50x50

d50x50

304 ms

d50x50

d50x50

294 ms

d50x50

d50x50

403 ms

d50x50

d50x50

403 ms

icon_orange.jpg

icon_orange.jpg

677 ms

d50x50

d50x50

411 ms

d50x50

d50x50

428 ms

d50x50

d50x50

498 ms

d50x50

d50x50

499 ms

d50x50

d50x50

507 ms

d50x50

d50x50

511 ms

newsletter_header_new.jpg

newsletter_header_new.jpg

720 ms

future-of-ai-video-2.png

future-of-ai-video-2.png

1135 ms

adsl.jpg

adsl.jpg

681 ms

claire2.jpg

claire2.jpg

784 ms

world-map.png

world-map.png

560 ms

vestula-semibold.woff

vestula-semibold.woff

230 ms

vestulapro-semibold.woff

vestulapro-semibold.woff

548 ms

vestula-regular.woff

vestula-regular.woff

367 ms

vestulapro-regular.woff

vestulapro-regular.woff

703 ms

fontello.woff

fontello.woff

300 ms

fontello.woff

fontello.woff

659 ms

jquery.js

jquery.js

618 ms

main.js

main.js

110 ms

box-more.js

box-more.js

95 ms

links.js

links.js

100 ms

nav.js

nav.js

100 ms

search.js

search.js

99 ms

sub-nav-tree.js

sub-nav-tree.js

100 ms

suggest.js

suggest.js

188 ms

track-event.js

track-event.js

190 ms

Accessibility Review

liacs.leidenuniv.nl accessibility score

77

Accessibility Issues

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

Buttons do not have an accessible name

High

Links do not have a discernible name

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.

Best Practices

liacs.leidenuniv.nl best practices score

83

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

SEO Factors

liacs.leidenuniv.nl SEO score

99

Search Engine Optimization Advices

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

    EN

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Liacs.leidenuniv.nl can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Liacs.leidenuniv.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

liacs.leidenuniv.nl

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