So I used Chromebook for couple of years and now I bought a new pc.
I was looking for a solution to film webcam videos.
All the Ubuntu apps did lag, but I noticed you can install a Google App.
It’s named Camera.
You can install the Camera app from Google webstore. And it runs without lag.
Logitech C615 runs with lag on Ubuntu software, but Google App doesn’t lag at all.
But you must run Google Chrome for it to work.