Umberto, I responded in both the Avsim forum and now here.
Which is now becoming *very* confusing and time consuming for me, since I might be supposed to reply on two identical threads now...as we said many times already, it doesn't make much sense to use Avsim as a support forum, it might be useful if you are discussing a product that doesn't have any support forum to begin with, or where the developers are known to not reply in time but, this is surely not the case.
I'm having frame rate issues...really! That means there are frame rate issues...
Nope.
That you are having frame rate issue, only means you have frame rate issues, not the scenery, otherwise it would happen to everyone. I've already replied in the *other* thread you are in (the 3rd one...), what might be the cause, your system is good hardware-wise, but crippled by a poor choice of software (XP32 and FS9).
The scenery DOES take quite a bit of VRAM so, it's possible that with your card taking away from the main memory (BECAUSE of the 32 bit OS), the video performances are going down, because the whole system is starving because of this.