We have here an HP workstation Xeon 5650 with k2000 graphics card and 48Gb of ram on win10 x64 pro.

Solidworks is flat lining RAM use at 4Gb.

Any ideas why this is?

Other applications are using as much ram as they need, well way more than 4Gb anyway.

Lots of things in solidworks are desperately slow on this particular machine, which i guess it due to it not using enough of its ample RAM.