It's just a trend I've picked up reading through comments in various discords and forums. I have 16gb and Le mans is a write off for me, all other tracks are smooth as silk. Similar things for others, doesn't seem to matter what graphics card they have, anything under 32gb and they seem to have issues. Could be just coincidence.LMU, or any other sim, should not need and does not as far I know, need so much RAM.
What I have realized is that it chows virtual memory like crazy. I was having a few memory issues then realized my C drive was on zero space left when I was playing and went straight back to 12gb of space when I exited the game. So I reconfigured my virtual memory to use a different SSD with more space and don't have half the issues I used to.