Comparing MSFS to X-Plane in terms of performance is not even something worth discussing, really. Getting into the complexities of DirectX vs OpenGL are just not worth the time. Simply put, they're different. X-Plane is not MSFS in terms of how it renders avionics. The core usage is important for numerous reasons. If this was slapped to one core you would not be pleased AT ALL....no one would. I also beg to differ with you on your sentiments about realism (coming from CRJ check airmen in this forum, as well as CRJ pilots on the beta team), and also about your statements regarding Felis' aircraft. He does a mighty fine job, though it does not reach this level (my opinion). At this time, the best thing you can do is upgrade your dual core machine to get better performance. I hate to say it, but as time goes on, so to do aged processors. I was in that boat up until a few months ago, so I can completely sympathize with your current position. I will say, however, that on the i5 and i7 setups, the CRJ runs phenomenally well!