If you are useing Windows 7 with an i7 Multi Processor, you might like to have a look at the Post I have written over on the Win7 OS Forum. Look for 'Disabling Parked Cores in Windows 7 using i7 Multi Processors'.Hope admin. don't mind me writing this short note here to direct people who I believe will have large benefits in FSX.

As mentioned over at the other post, it's no use if you already have HT disabled which most will for FSX(null)