I see hundreds of messages like the following in the console log of the browser
[Violation] Added non-passive event listener to a scroll-blocking event. Consider marking event handler as ‘passive’ to make the page more responsive. See
There are of slightly different types, refering to mousewheel, touchmove, touchstart etc… events
I use jupyterlab 3.6.7 in chrome, running on Jupyterhub with a custom image.