In my sim, there is a lot of stuttering. I have reinstalled windows and x plane multiple times with no change. my framerate is ok. Even on the lowest setting it still stutters but the frame rate does improve.
system:
intel i5 4690k
gtx 980
m.2 drive for windows ( I have the newest version of windows home)
hard drive 1tb (x plane 11 and other things)
1080 monitor
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Maybe the screen shot and the log.txt file can help. I have been searching for help for months because the stuttering renders the game unplayable. If you need any other info about my system please ask.