I don't recall having problems with boot times, I think a few seconds and I was ready to go (my ssd also helps a bit I think). The performance issues I've noticed was actually after login, during the normal use of the OS, for example firefox was really slow and non responsive at times specially when I'd press open a new tab, nvidia experience not working properly, non responsive, hanging, slow file explorer. After disabling avast the problems disapeared instantly and all running smoothly... I don't understand.