So I'm on this cheaper laptop with Ubuntu 20.10 (Core i3 dual-core with 8 gigs of RAM) and it gets super slow for a while after booting. I set up full disk encryption at the time of install so the setup is ext4 over LUKS over LVM. I have some Snaps, some Flatpaks, and Steam installed.

The system for a while after bootup is super slow like I can barely browse the web and I get like 7 fps on this Native game I play but after 20-25 minutes it becomes faster and it performs as well as before I put Ubuntu on it and used Manjaro (without disk encryption) and I start getting like 60+ fps on the same game.

I have no idea what is happening. Is this related to the encryption? I've tired removing gnome-software and the snap-store but to no affect. Any help would be amazing.

you need to check what is running in the first 20-25 minutes.

I tried but through htop but couldn't find anything. I am at my wits end here. This never happened with my other Linux installs (including other Ubuntu versions) on this laptop so I'm thinking this may be a distro specific bug with LUKS/LVM here. Thinking of trying Linux Lite or Peppermint OS or maybe even MX Linux. Sadly this software I need only has a .deb version.