Hello. The other day, I downloaded a c172r aircraft for FSX because it said its gauges run smoothly. The gauges were very smooth, I especially liked how the VOR's behave as I have observed in my own aircraft (C182D). I also use FS9 when I want multiple screens because WideView 2000 works with FS9 and at that time frame, was free. Free helps to make my wife happy. I decided to convert the FSX VOR1 gauge for use in FS9. It wasn't as difficult as I imagined using "find and replace" in Notepad. When I got the gauge running in FS9, I was disappointed because it looked great but was not as smooth. So I took that same gauge and put it in the FSX aircraft to compare with the FSX xml gauge. The FS9 xml gauge did not run smoothly as the FSX xml gauge. What is FSX doing differently that its XML schema runs faster (especially since FSX XML schema is so verbose)? Mind you, I am using the same computer.