In fact... they have no voice, literally. That's why you've not been contacted. When they are able to speak, they will contact you.

It's been 10 more days.  Still no contact.

Ok... support keeps coming back to me at this point and I have only one final suggestion. I would recommend you obtain Microsoft's Process Explorer and use it to see if you can catch what process is causing the stutters as it should show as a CPU usage spike, at the least.

 

It is something about your system and not the software itself... despite your thoughts otherwise.

Thank you.  I appreciate having a tool that might show where the problem lies.  I've downloaded it and I'll see what it shows later today.

Over the past few days I've done several identical short flights around the traffic pattern in the default FSX C172 and the C172 with MindStar G1000.  In each case, fsx.exe CPU use varied between about 20% and 50%.  The only other significant CPU users were TrackIR at 4% and ActiveSky at 1%.  There was no difference in CPU usage between the two airplanes.  I saw no transient spikes in CPU usage by any other application.  Default C172 frame rates were in the mid-30s.  MindStar G1000 C172 frame rates were in the mid-20s, with drops to 2 fps every 10 seconds or so (with GpsRedrawRate=4).  I see no correlation at all between the frame-rate drops and increases in CPU, memory, or I/O usage.  Please let me know if there's anything specific I should be looking for in Process Explorer that would help indicate what the problem is.

Which means the entire drop lies directly upon your video chip. It's a horribly underpowered video chip, even for a laptop.

 

At this point, there's honestly little I or anyone else could do.

Well, I remain surprised that every other FSX add-on I've got runs just fine on my machine, and I'm grateful that at least I've got a working G1000 on the Flight1 C182 and Mustang.  Thanks for your time.