RedPxl

Might not apply in this case, but I know sometimes I have big fps difference if I run X-Plane in full screen or in window mode not sure why sometimes it have no effect and other time fps drops a lot in window mode.

you can always try x-Assign and x-SavePluginStatus by barbarossa. Without doing everything you're asking, it can save your controllers configurations (including artificial stability and response curve) your views and plugins status for all your aircraft.

Still no official update from x-aviation, but Tom Kyler released a beta patch for his excellent MU-2 including the new 530. (an official update should appear eventually) http://forums.x-pilot.com/topic/6884-new-gns-430/?p=75282

If not done already, try removing all plugins (and make sure they're all up to date). I had serious intermittent stuttering with b8 and rc1 but it seems it was cause with an out of date (beta) Real Terra Haze (a FlywithLua script). Found the faulty plugin by removing them all and adding them back one by one. So far no stuttering after updating this script. I realize many reasons could create this stuttering but never know plugins can be one of them, worth a try if you haven't already.

They update the "Miscellaneous Bug Fixes" of the beta release notes (scroll down) before releasing new beta versions (at least they did for the last two) :smile:

Are you running X-Plane in full screen or windows mode? I had a similar problem where my fps were limited and CPU usage was between 60-70% Switching back to full screen made my CPU usage go back over 95% and of course gain a lot of fps.