I have an i7 with 16 gigs of RAM, a 1060 with 6 GB of RAM, and a solid state drive.
I experienced some lag on a recent play-through.
I then started a Skyrim highly modded play-through with 4K textures:
I began experiencing lag that grew over time (same as BG3).
After eliminating the possibility of a memory leak, I discovered a cooling issue, that when resolved left me lag free.
SOOO...a mid tier rig like mine should have no issues and is probably major over-kill.