Or, maybe the best way around would be to not press control Z twice and just be content with smooth and fluid performance and not look at frame rates. right?  I mean if the plane is handling alright and there 's no stuttering in motion why worry if its 15fps or 30?  Long as its smooth.  I had a lotta fun flying before I started pressing control Z twice.  Ever since its taken a lot of joy away from the experience.