Hello.
Don't worry about your DCS Install.
I also have noticed massive impact on performance since late 2.8 & beginning of 2.9 while using Targeting Pods or TV Cameras especially with with flatter angles that allow a lot of Trees and scenery to be rendered in the MFD/TV Screen. It can easily half your frame rate and in extreme cases (most often found in the harrier) get you single digit FPS.
Addressed this before and it has been addressed on rare occasions. Not to sure where the problem is buried but hopefully with Vulkan it will go away or getting finally attention and is being fixed.
