Bitwarden, Aegis (2FA app for Android), Syncthing are probably the most impactful

Still enough to generate heat for something like dust to catch fire if it shorts

AMD gpus has better support but many have had decent experience with nVidia cards too. Cpu it doesn’t matter afaik.

I don’t, Safing was the first I heard that does anything like that and only one i’ve used

Safing Portmaster is similar for Windows and Linux, also FOSS

These are super compressed, 4k looks worse than 1080p good quality videos