We've been battling issues like this since we've been using solidoworks. Our re-sellers keeps telling us the network, the server, the pc etc. We ruled all that out and still having issues. Our Vault server is a quad core zeon with 156 GB of ram runnign windows 2008 server with sql 2012. Our network is  a 1 GB lan. And we upgraded a computer to a 10 core processor, 32 GB ram, 2 SSD drives and an nvidia K4200 card. Our issue seems to be when exiting or saving models. We wil lopen a model, move a part, then attempt yo exit. The system will ask if we are making any changed, we click "do not save" and we will get the spinning circle for 30-60 seconds or more. before it does anything. We are exiting without saving, What could the software possible be doing? It's like it is waiting for something to timeout.