I work with detailed assemblies from 25 to 250 MB. Basic working station configuration is Intel i7-3740QM, 24GB RAM, SSD 512GB, Nvidia Quadro K4000M 4GB. Since I tried to set and configure SW in any possible and recommended way with no improvement at all, is it time for a new working station or SW 2018 sp5 isn't as good as previous versions?
I think it is an issue with your "detailed assemblies" because I use SWX 2018 sp5 with no complaint.