Wailwulf: For me, when FPS is 100 to 120+ the planes become to hard to handle and that is when they seem to start moving to fast.
When I started RB3D, I was lucky to get 25 FPS and it seemed fairly slow, though at times it would drop to 10-12 FPS and I did notice stutter then.
With my current machine I anywhere from 50 to 80 with the average being 60 FPS, and it is very smooth, no stutters nor any twitchy/overly-responsive controls.
I use FRAPs for my FPS, the reason being for my, using RB3D's FPS counter gives me a 10 FPS hit. For example, if I am flying, RB3D FPS counter says I am doing 50 FPS, but if I use FRAPs instead, it says I am getting 60 FPS in the same situation. Well, ne of them must be off, you say, but which one? Well niether are off, both are telling the truth. How is that?
Well, if I am using FRAPS and it is telling me 60 FPS, I then turn on RB3D's FPS counter (alt+f) and RB3D's and FRAPs will then both tell me I am getting 50 FPS. I turn off RB3D's counter and FRAPS jumps back to 60 FPS
For that, I feel FRAPs is best for figuring out one's true FPS in RB3D.
Interesting so I am probably really getting around 23-28 FPS depending on my graphics settings then. I have a brand new computer (i7 dual-core laptop with nvidia 330M) but I am running Windows 7 in BootCamp (either that or I am running RB3D in WIne) - that might limit my access to drivers and the such. However, I downloaded new Direct X driver for 7 and didn't see much improvement, like 1 FPS.
While the game feels playable to me, maybe I should stay away from the more graphics intensive mods. I bought it mostly for SP, but I have started on a multiplayer version too. :)
EDIT: So for the FPS I think may be a difference between SP and MP. I just ran a solo flight for MP and it said I was getting around 60 FPS with the same settings that SP was saying I had 15-17. I will endeavor to test this out more to see if it is just a reporting difference or something real.