I've been running 24.8 to 25 FPS in GW3....so this drop in frame rates really baffled me. In my GA version of GW, frames rates were half of what they normally were...but only around one area. If I started from different airports, frame rates were back to normal. So, I fired up my Military version of GW and started from the problem airport (KMFD...my home airport) and every thing was fine. Used the same airplane in both tests (stock C172, same paint job), same mesh, GW3. The difference came down to some add on scenery stuff. In my GA version of GW3, I had three addons for my home area...one to enhance a stock strip (OI60, Gorman) into my personal flying club; one to build the float/amphib part of my personal flying club just over the hill from Gorman (named it OI61) and a addon by someone that made major corrections to the lakes around this area (including Charles Mill Lake, on which my float/amphib flying club is situated). Something within these three scenery thingies was conflicting...so I deactivated all three until I get it figured out....frame rates are back to the normal 24.9 to 25 FPS.
OBIO