Tools & Wizards About Us
jonathan-weber.eu screenshot

Report Summary

  • 68

    Performance

    Renders faster than
    80% of other websites

  • 79

    Accessibility

    Visual factors better than
    that of 47% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 96

    SEO

    Google-friendlier than
    90% of websites

jonathan-weber.eu

Pr. Jonathan Weber, Full Professor in Computer Science

Page Load Speed

3.1 sec in total

First Response

618 ms

Resources Loaded

1.3 sec

Page Rendered

1.2 sec

jonathan-weber.eu screenshot

About Website

Visit jonathan-weber.eu now to see the best up-to-date Jonathan Weber content and also check out these interesting facts you probably never knew about jonathan-weber.eu

Personnal website of Pr. Jonathan Weber, Full Professor in Computer Science of the Université de Haute-Alsace

Visit jonathan-weber.eu

Key Findings

We analyzed Jonathan-weber.eu page load time and found that the first response time was 618 ms and then it took 2.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 50% of websites can load faster.

Performance Metrics

jonathan-weber.eu performance score

68

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.1 s

80/100

10%

LCP (Largest Contentful Paint)

Value4.9 s

29/100

25%

SI (Speed Index)

Value3.1 s

93/100

10%

TBT (Total Blocking Time)

Value20 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.418

23/100

15%

TTI (Time to Interactive)

Value3.0 s

96/100

10%

Network Requests Diagram

jonathan-weber.eu

618 ms

bootstrap.min.css

173 ms

font-awesome.min.css

37 ms

academicons.min.css

177 ms

main.css

197 ms

Our browser made a total of 27 requests to load all elements on the main page. We found that 85% of them (23 requests) were addressed to the original Jonathan-weber.eu, 7% (2 requests) were made to Maxcdn.bootstrapcdn.com and 4% (1 request) were made to Fonts.googleapis.com. The less responsive or slowest element that took the longest time to load (664 ms) belongs to the original domain Jonathan-weber.eu.

Page Optimization Overview & Recommendations

Page size can be reduced by 109.5 kB (21%)

Content Size

522.5 kB

After Optimization

412.9 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Jonathan-weber.eu main page is 522.5 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. Images take 387.8 kB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 86.4 kB

  • Original 104.7 kB
  • After minification 75.3 kB
  • After compression 18.3 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 29.4 kB, which is 28% 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 86.4 kB or 83% of the original size.

Image Optimization

-6%

Potential reduce by 22.9 kB

  • Original 387.8 kB
  • After minification 364.9 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. Jonathan Weber images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 44 B

  • Original 11.7 kB
  • After minification 11.7 kB
  • After compression 11.7 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.

CSS Optimization

-1%

Potential reduce by 164 B

  • Original 18.2 kB
  • After minification 18.2 kB
  • After compression 18.1 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. Jonathan-weber.eu has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 4 (17%)

Requests Now

24

After Optimization

20

  • Images
  • JavaScript
  • CSS

The browser has sent 24 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Jonathan Weber. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

jonathan-weber.eu

jonathan-weber.eu

618 ms

bootstrap.min.css

bootstrap.min.css

173 ms

font-awesome.min.css

font-awesome.min.css

37 ms

academicons.min.css

academicons.min.css

177 ms

main.css

main.css

197 ms

css

css

40 ms

JW.png

JW.png

620 ms

pelican.png

pelican.png

175 ms

coastal.jpg

coastal.jpg

383 ms

tesysp.png

tesysp.png

306 ms

jquery-2.2.0.min.js

jquery-2.2.0.min.js

9 ms

bootstrap.min.js

bootstrap.min.js

227 ms

main.js

main.js

232 ms

html5.svg

html5.svg

235 ms

css3.svg

css3.svg

320 ms

js.svg

js.svg

322 ms

bootstrap.svg

bootstrap.svg

313 ms

jquery.svg

jquery.svg

420 ms

brackets.svg

brackets.svg

413 ms

gimp.svg

gimp.svg

410 ms

filezilla.svg

filezilla.svg

408 ms

firefox.svg

firefox.svg

664 ms

ovh.svg

ovh.svg

496 ms

piwik.svg

piwik.svg

497 ms

by-nc-sa.svg

by-nc-sa.svg

499 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

20 ms

academicons.ttf

academicons.ttf

390 ms

Accessibility Review

jonathan-weber.eu accessibility score

79

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.

ARIA

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.

Impact

Issue

High

ARIA IDs are not unique

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

Links do not have a discernible name

Best Practices

jonathan-weber.eu best practices score

67

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

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

jonathan-weber.eu SEO score

96

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 Jonathan-weber.eu 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 Jonathan-weber.eu 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

jonathan-weber.eu

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