Very Slow Loading of Assemblies

[Maze]

Hi All,
I'm using SW Student 2019 downloaded in Dec 2019.
Parts load from memory very quickly.
Assemblies take a very long time (3 to 15 minutes) even for super simple two part assemblies.

If I open the component parts first, then open the assembly it opens very quickly. But if I try to open the assembly directly it takes forever to open and seems to get stuck on opening part 1.

Any help would be richly appreciated.

Thank you
Maze