Hi. I recently picked up the CS767 and the aircraft itself is great. However i'm having an issue where during the preflight of any flight, my fps is totally fine, mid 30s to 40s. Just after takeoff and in the climb its also pretty good, hovering in the 30s with no stutters. However after around 15 minutes of flying stutters down to around 15 fps start to develop, still with a framerate of around 35. However the further the flight goes on, the worse the stutters get, and eventually it gets so bad that by the end of the flight and during landing im having around 15 fps. This really spoils the enjoyment for me, and other than that i think the aircraft is absolutely superb, especially for the price it was.

Thanks!  :)

I'm in P3Dv5.2 HF1, had the same issue in 5.2 no HF too.