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physics.leidenuniv.nl screenshot

Report Summary

  • 0

    Performance

  • 0

    Accessibility

  • 0

    Best Practices

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    SEO

physics.leidenuniv.nl

Leiden Institute of Physics - Leiden University

Page Load Speed

5.7 sec in total

First Response

1.1 sec

Resources Loaded

4.3 sec

Page Rendered

349 ms

physics.leidenuniv.nl screenshot

About Website

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

Research at the Leiden Institute of Physics (LION) is foundational and curiosity driven. All our scientists share a desire to increase the knowledge of the world around us, in an open atmosphere of in...

Visit physics.leidenuniv.nl

Key Findings

We analyzed Physics.leidenuniv.nl page load time and found that the first response time was 1.1 sec and then it took 4.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.

Performance Metrics

physics.leidenuniv.nl performance score

0

Network Requests Diagram

physics.leidenuniv.nl

1050 ms

jquery.min.js

448 ms

jquery-noconflict.js

195 ms

jquery-migrate.min.js

196 ms

caption.js

196 ms

Our browser made a total of 68 requests to load all elements on the main page. We found that 65% of them (44 requests) were addressed to the original Physics.leidenuniv.nl, 22% (15 requests) were made to Pbs.twimg.com and 6% (4 requests) were made to Platform.twitter.com. The less responsive or slowest element that took the longest time to load (2.3 sec) belongs to the original domain Physics.leidenuniv.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 596.4 kB (22%)

Content Size

2.7 MB

After Optimization

2.1 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Physics.leidenuniv.nl main page is 2.7 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. 50% of websites need less resources to load. Images take 2.3 MB which makes up the majority of the site volume.

HTML Optimization

-67%

Potential reduce by 19.8 kB

  • Original 29.5 kB
  • After minification 27.4 kB
  • After compression 9.7 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. 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 19.8 kB or 67% of the original size.

Image Optimization

-14%

Potential reduce by 312.8 kB

  • Original 2.3 MB
  • After minification 2.0 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. Obviously, Physics Leiden Univ needs image optimization as it can save up to 312.8 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

-68%

Potential reduce by 161.1 kB

  • Original 238.2 kB
  • After minification 226.1 kB
  • After compression 77.1 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 161.1 kB or 68% of the original size.

CSS Optimization

-83%

Potential reduce by 102.7 kB

  • Original 123.3 kB
  • After minification 84.1 kB
  • After compression 20.6 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. Physics.leidenuniv.nl needs all CSS files to be minified and compressed as it can save up to 102.7 kB or 83% of the original size.

Requests Breakdown

Number of requests can be reduced by 32 (52%)

Requests Now

61

After Optimization

29

  • Images
  • JavaScript
  • CSS

The browser has sent 61 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Physics 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 14 to 1 for JavaScripts and from 12 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

physics.leidenuniv.nl

physics.leidenuniv.nl

1050 ms

jquery.min.js

jquery.min.js

448 ms

jquery-noconflict.js

jquery-noconflict.js

195 ms

jquery-migrate.min.js

jquery-migrate.min.js

196 ms

caption.js

caption.js

196 ms

bootstrap.min.js

bootstrap.min.js

293 ms

html5fallback.js

html5fallback.js

262 ms

system.css

system.css

373 ms

position.css

position.css

374 ms

layout.css

layout.css

484 ms

leidenuniv.css

leidenuniv.css

553 ms

lion.css

lion.css

647 ms

general.css

general.css

551 ms

general_mozilla.css

general_mozilla.css

551 ms

hide.js

hide.js

639 ms

confirmdelete.js

confirmdelete.js

662 ms

datefunctions.js

datefunctions.js

817 ms

datetimepicker.js

datetimepicker.js

841 ms

scrolling_table.css

scrolling_table.css

666 ms

system.css

system.css

368 ms

zegel.png

zegel.png

100 ms

mainnavborder.png

mainnavborder.png

1007 ms

physics.jpg

physics.jpg

907 ms

blauwepijl.png

blauwepijl.png

199 ms

linkedin.png

linkedin.png

199 ms

youtube.png

youtube.png

199 ms

pinterest.png

pinterest.png

293 ms

twitter.png

twitter.png

377 ms

facebook.png

facebook.png

403 ms

NL-flag.gif

NL-flag.gif

405 ms

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737 ms

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825 ms

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1779 ms

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872 ms

widgets.js

widgets.js

92 ms

bkg_middle.png

bkg_middle.png

907 ms

icon-print.gif

icon-print.gif

995 ms

fontello.woff

fontello.woff

1042 ms

fontawesome-webfont.svg

fontawesome-webfont.svg

1557 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

1294 ms

vestula_semiboldr-webfont.woff

vestula_semiboldr-webfont.woff

1279 ms

vestula_regular-webfont.woff

vestula_regular-webfont.woff

1382 ms

arrow_right.png

arrow_right.png

1212 ms

world-map.png

world-map.png

2281 ms

analytics.js

analytics.js

23 ms

collect

collect

23 ms

timeline.1b43d11859b7663a2225b885f87704a5.js

timeline.1b43d11859b7663a2225b885f87704a5.js

132 ms

syndication

syndication

97 ms

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633251878621548544

101 ms

timeline.4d087f49a21e27038d9769d7c976b8fa.default.css

timeline.4d087f49a21e27038d9769d7c976b8fa.default.css

30 ms

timeline.4d087f49a21e27038d9769d7c976b8fa.default.css

timeline.4d087f49a21e27038d9769d7c976b8fa.default.css

79 ms

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84 ms

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82 ms

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84 ms

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85 ms

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93 ms

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82 ms

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90 ms

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90 ms

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98 ms

jot

jot

35 ms

print.css

print.css

99 ms

SEO Factors

physics.leidenuniv.nl SEO score

0

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 Physics.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 Physics.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

physics.leidenuniv.nl

Open Graph description is not detected on the main page of Physics Leiden Univ. 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: