DOn't only increase the physical memory (RAM), see if you can also increase the virtual memory (swap file size). The default is managed by windows and is about 1.5x to 2x the amount of physical ram, and it might be set to increase ondemand but then again I don't know if that's working reliably. Best is to allocate a 3-4 GB chunk of disk space for the swapfile and leave it at that max size. I think you should not ask the OS to waste any time and resources in finding out if it needs more virtual memory or to allocate more if so. Just give it the max.  Then indeed also get more Ram if you can afford it. It's cheeap, but hey, it's not free, and neither is the gasoline for the trip down to the store.