Jeroenjanssens.com Site Title

Jeroen Janssens

Jeroenjanssens.com Meta Description

? I'm Jeroen. Welcome to my site. ? I work at Xomnia in Amsterdam as a Senior Machine Learning Engineer. ✍️ I’m currently writing Python Polars: The Definitive Guide with Thijs Nieuwdorp. I’m also the author of Data Science at the Command Line. The second edition was published by O’Reilly in 2021. ? Most of my bugs are written in Python, R, JavaScript and Bash. Every now and then I dabble in C and Lua. I should learn Rust. ?? I live in Rotterdam, the Netherlands with my wife and two kids....

Jeroenjanssens.com Test Results

jeroenjanssens.com Mobile Usability: 71/100

Quick overview:
Size content to viewport
The page content is too wide for the viewport, forcing the user to scroll horizontally. Size the page content to the viewport to provide a better user experience.
The page content is 736 CSS pixels wide, but the viewport is only 412 CSS pixels wide. The following elements fall outside the viewport:
The element <h1>Jeroen Janssens</h1> falls outside the viewport.
...
Size tap targets appropriately
Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.
The following tap targets are close to other nearby tap targets and may need additional spacing around them.
The tap target <a href="http://www.lin…jeroenjanssens">LinkedIn profile</a> is close to 1 other tap targets .
...

jeroenjanssens.com Mobile Speed: 61/100

Quick overview:
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 2 blocking CSS resources. This causes a delay in rendering your page.
None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.
Optimize CSS Delivery of the following:
http://jeroenjanssens.com/css/screen.css
...
Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 301.8KiB (78% reduction).
Compressing and resizing https://www.datascienceatthecommandline.com/images/cover.png could save 213.9KiB (94% reduction).
...
Leverage browser caching
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Leverage browser caching for the following cacheable resources:
http://jeroenjanssens.com/css/screen.css (10 minutes)
...
Minify CSS
Compacting CSS code can save many bytes of data and speed up download and parse times.
Minify CSS for the following resources to reduce their size by 838B (27% reduction).
Minifying http://jeroenjanssens.com/css/screen.css could save 838B (27% reduction) after compression.

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