On Ubuntu 19.10, my cursor freezes after a long period of time not using the system. The keyboard works fine then, though.
My laptop is a 2011 MacBookPro, where I'm only using the Intel videocard, as the Radeon card is defective. I boot 19.10 normally, and 19.10 runs very stable on this machine, unlike Elementary OS even when bypassing the Radeon video card.
ls -al ~/.local/share/gnome-shell/extensions
. Start comments to me with @heynnema or I may miss them.sudo swapoff -a
and see if you still get laggy performance. I have a hypothesis that this may be related to swapping.