I've had O&O Defrag 14 since August 2010, and it has been set to auto defrag (optimized) and I have always had good frame rates with my Captain Sim planes in FSX since then. BUT. What makes it even harder for me to tell if the improvements were because of using O&O Defrag 14 or not, was that I upgraded my computer only a week or two before I got it. ;)

I must admit that I got it because NickN recommended it.

Mark