VERY LOW FPS with AI traffic

[Roberto]

I recently formatted my HD. Since then I have noticed that my FPS drops considerably if I'm close to any AI traffic . This bothers me the most when I'm approaching and other aircraft become visible. I have tried by setting Aircraft settings in the Display section to minimum and that doesen't help. It also won't help if I set my fraffic density lower since I only need one or two planes to have my FPS drop.
Before I formated I coppied my aircraft folder to another drive and then back again after re-installation to lower my "workload", but I don't see how that could have effected!

[Roberto]

This to add!! Could the textures for ONE aircraft effect the FPS when I see any aircraft. OR could the number of aircraft I have in FS and use as AI effect framerate. I have 48 different airlines (planes have more texture packages).