Best Point Cloud import format

I'm currently working with importing rather large Point Clouds and even with a super computer running 128 GB of ram and a GV100 GPU it still feels "choppy". Is there any good format which will lower the strain on the computer? I've tryed ASC2 RGB and ASC2 FREE, where the FREE format is the best so far, but there are 10 options, and i don't have time to import for all 10 options and wait to see if there is any better options. Anyone has any experience with this?

PS. Using 2019x Hotfix 3, and Digitized shape preperation.