Hi guys.I have FSX with all the ORBX north american add ons.( Dont have REX yet!) I easily get 30-45 fps.I only have a dual core AMD w geforce video card.nothing fancy.You do have to tone down the settings. The Orbx scenery is amazing, just adjust your settings so there is no flicker or pauses and enjoy -- you do not need 60 plus fps -- I have tons of flying time on FSX it is the best flight sim !!!