Most of the time when I try to play it takes an extremely long time to load in. I'm running on the lowest settings right now and it doesn't make much difference. I know my computer isn't the greatest but I'd imagine it'd be able to run this. Perhaps it's just because of it currently being in an early, under optimized build. The biggest problem is when loading into Team Armies games, that often never load in. DXDIAG:
Are you update/running PA from Steam? If yes, please try to download and run PA using Uber launcher: https://store.uberent.com/Download/Install?titleId=4 And post back here about changes if you have any.
It may depend on the size of map you are attempting to generate. You may be maxing out your RAM. 4 gigs is not really enough for most medium-sized games.