In Batumi, during Sabre TLA mission (Flight Qualification Campaign), for both A-10A and F-15C, we have a great loss in FPS when looking to airport facility area, or to something behind.
I tried everything, set all options to low, set low resolution, and nothing.
I think that there are some object in the scenario that is broken FPS. When I´m taxing to parking area, It is unplayable, FPS is about 14.
When I'm looking to another area, the FPS is good, no problem, and this occur with 1.5.1, 1.5.2 and 1.5.3 versions, Beta and stable.