Dear Herbie,
Thanks for the image good shooting, what did you hit?
A thought for you; I notice you have the TASK BAR showing on your screen grab.
A tip I have seen on the Just Flight forum is to set the Task Bar to "auto-hide" to reduce the load on the processor and so increase the frame rate. Apparently the Task Bar (with clock etc) is processor hungry so this might improve your PC's performance a little.
Happy hunting,
Tregarth