Kitkun,
At that time, was referring to demo version. Was running it in default settings, which I think were Highest in all but bumps, that was set to low. Is playable without major difficulties except when fleets get real big... say past the halfway point of the Logistics research tree.
At that point it is still playable, just slow in resolving combat and a bit sluggish.
Bought the game, and the gold version works great -- no crashes, very stable, settings at High or Hihgest. Slow when fleets are large, but thats to be expected...
Just managed to get Impulse working, downloaded the new version, going to test it out tonight. Will let you know.

Ironically, the game at highest is more stable than Impulse itself...
-Kyrie