In my opinion, a better processor is the key not only for this sim, but for any game that requires tons of GHz for running well. The graphic card and RAM is important, but in this case is too much processing in background: earth units, air units, sea units, flights, missiles, anti aircraf guns, triggers, the AI of the units, etc, etc, etc... All of them managed by the CPU. If you CPU is old or not much fast, this things kills the performance.