I have 2 GB of RAM and GW loads really slow, both the game and especially missions. There's a few hiccups during high TC travel as well.
That said, it's fun and beautiful.

Though I had AntiAliasing turned way up, I turned it off because it really makes some periscope and smoky scenes choppy. I need to turn it on again since map lines are all "stepy" but when I turned it OFF my PC crashed hard, powered right off.. so I'm afraid to turn it back on.