Tools & Wizards About Us
christianholz.net screenshot

Report Summary

  • 66

    Performance

    Renders faster than
    79% of other websites

  • 48

    Accessibility

    Visual factors better than
    that of 20% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    81% of websites

  • 91

    SEO

    Google-friendlier than
    71% of websites

christianholz.net

christian holz | mixed reality & mobile health

Page Load Speed

16.4 sec in total

First Response

326 ms

Resources Loaded

3.3 sec

Page Rendered

12.8 sec

christianholz.net screenshot

About Website

Click here to check amazing Christian Holz content. Otherwise, check out these important facts you probably never knew about christianholz.net

Christian Holz is an assistant professor at ETH Zurich, leading the Sensing, Interaction & Perception Lab in the Computer Science department.

Visit christianholz.net

Key Findings

We analyzed Christianholz.net page load time and found that the first response time was 326 ms and then it took 16 sec to load all DOM resources and completely render a web page. This is a poor result, as 90% of websites can load faster.

Performance Metrics

christianholz.net performance score

66

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.6 s

31/100

10%

LCP (Largest Contentful Paint)

Value16.7 s

0/100

25%

SI (Speed Index)

Value3.9 s

83/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value3.6 s

91/100

10%

Network Requests Diagram

christianholz.net

326 ms

www.christianholz.net

1527 ms

dc.js

271 ms

style.css

270 ms

christianholz.jpg

408 ms

Our browser made a total of 47 requests to load all elements on the main page. We found that 96% of them (45 requests) were addressed to the original Christianholz.net, 4% (2 requests) were made to Stats.g.doubleclick.net. The less responsive or slowest element that took the longest time to load (1.5 sec) belongs to the original domain Christianholz.net.

Page Optimization Overview & Recommendations

Page size can be reduced by 56.0 kB (7%)

Content Size

795.8 kB

After Optimization

739.7 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Christianholz.net main page is 795.8 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. 65% of websites need less resources to load. Images take 725.0 kB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 30.9 kB

  • Original 39.3 kB
  • After minification 37.2 kB
  • After compression 8.4 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 30.9 kB or 79% of the original size.

Image Optimization

-2%

Potential reduce by 14.4 kB

  • Original 725.0 kB
  • After minification 710.6 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. Christian Holz images are well optimized though.

JavaScript Optimization

-9%

Potential reduce by 1.8 kB

  • Original 19.6 kB
  • After minification 18.5 kB
  • After compression 17.8 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

-75%

Potential reduce by 8.9 kB

  • Original 11.8 kB
  • After minification 11.2 kB
  • After compression 2.9 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. Christianholz.net needs all CSS files to be minified and compressed as it can save up to 8.9 kB or 75% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

45

After Optimization

45

  • Images
  • JavaScript
  • CSS

The browser has sent 45 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Christian Holz. According to our analytics all requests are already optimized.

Network Requests Diagram

christianholz.net

christianholz.net

326 ms

www.christianholz.net

www.christianholz.net

1527 ms

dc.js

dc.js

271 ms

style.css

style.css

270 ms

christianholz.jpg

christianholz.jpg

408 ms

eth_white.png

eth_white.png

397 ms

zanzibar.jpg

zanzibar.jpg

397 ms

haptic_links.jpg

haptic_links.jpg

395 ms

scripts.js

scripts.js

341 ms

hapticrevolver.jpg

hapticrevolver.jpg

946 ms

canetroller.jpg

canetroller.jpg

945 ms

claw.jpg

claw.jpg

945 ms

surfaceconstellations.jpg

surfaceconstellations.jpg

943 ms

polartrack.jpg

polartrack.jpg

979 ms

glabella.jpg

glabella.jpg

945 ms

capacitive_survey.png

capacitive_survey.png

945 ms

sparse_haptic_proxy.jpg

sparse_haptic_proxy.jpg

946 ms

dualblink.jpg

dualblink.jpg

980 ms

normaltouch.jpg

normaltouch.jpg

978 ms

duoskin.jpg

duoskin.jpg

978 ms

pretouch.png

pretouch.png

980 ms

on-demand_biometrics.png

on-demand_biometrics.png

979 ms

biotouch.png

biotouch.png

972 ms

tracko.png

tracko.png

984 ms

pamessaging.png

pamessaging.png

971 ms

inhome.jpg

inhome.jpg

983 ms

bodyprint.png

bodyprint.png

983 ms

timeaway.png

timeaway.png

985 ms

fiberio.jpg

fiberio.jpg

982 ms

quantumball.jpg

quantumball.jpg

982 ms

imaginary_devices.png

imaginary_devices.png

1013 ms

gravityspace.png

gravityspace.png

982 ms

implanted_user_interfaces.png

implanted_user_interfaces.png

1011 ms

bootstrapper.png

bootstrapper.png

980 ms

imaginary_phone.png

imaginary_phone.png

969 ms

data_miming.png

data_miming.png

981 ms

understanding_touch.png

understanding_touch.png

969 ms

multitoe.png

multitoe.png

982 ms

ridgepad.png

ridgepad.png

983 ms

relaxed_selection_techniques.png

relaxed_selection_techniques.png

843 ms

background-top.jpg

background-top.jpg

843 ms

background-bottom.jpg

background-bottom.jpg

844 ms

vstretch-top.jpg

vstretch-top.jpg

842 ms

vstretch-bottom.jpg

vstretch-bottom.jpg

798 ms

__utm.gif

__utm.gif

324 ms

icons.png

icons.png

153 ms

style-print.css

style-print.css

65 ms

Accessibility Review

christianholz.net accessibility score

48

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.

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

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

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

christianholz.net best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

SEO Factors

christianholz.net SEO score

91

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

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 Christianholz.net 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 Christianholz.net 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

christianholz.net

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