Yes I am sorry it is such a lottery when it comes to FSX.
I have to say that I run a dualcore with 2gigs of ram and an 8 series nVidia card at home and I actually get better framerates on that than I do on a couple of our quadcores running 4 gigs. Go figure that...:mixedsmi:
To be honest, the Tilt has a lot of features and options necessary to make the most of VTOL and VSTOL, so it is definitely designed for the bigger rigs. FS9 seems to be behaving well though, especially with the patch components now installed(ready soon).
As a dev, believe me, once you have tasted what is actually achievable with the FSX exporter, it is damned hard to leave stuff out!