Since Monday september 30 when i chenge my nvidia driver to the new GeForce 331.40 Beta i notice a 40fps drop on Altis on a intel 3930k @4.7 tri-sli gtx 680 16 ram @2133, so i went back to the old nvidia driver and the same happened. So i changed to stable branch and i got back the 40 fps.
I have a FPStest.altis mission where i have a unit(player) placed on altis and nothing else, to check fps and performance on new drivers. And since monday on DEV is 40fps less only in altis, on FPStest.stratis still the same in both branches.
Just tested on another PC AMD Phenom II X4 970 BE 2 4.0Ghz ATI 5970 4GB ram @ 1600 and the same! Stable branch at 90 fps and DEV at 68 fps! Only in altis! {F22441}