sry for bad english... no native speaker :)
but I`ve done some testing and what I`ve discovered is:
When framerate drop begins I see some flickering of surrounding graphics... then the framerate starts dropping from 47, 20...., 3 (staying there)
But the framrate could be influenced whilst looking through magnifying scope.. frames upramping to 47 again.. and holding there... putting down magnifying scope.. frames dopping again to 3 and lower?!?!
framerate recover`s only with a newstart from launcher... leaving the editor to mainscreen does not solve this issue...