Using the maximum component size isn’t always great idea. I suggest you have a read through this if you haven’t already.
Also, other than the CPU in the second one, neither of those PC specs are that beefy. I assume they are budget PC builds due to the low end GPU? Which also leads me to believe they are running HDDs as opposed to SSD’s?
I would have a look at some existing example projects on the launcher. Particularly the landscape related ones. See if you get the same sort of issues. But I am doubtful of you getting decent editor performance with those specs.