I purchased the Embraer Phenom 100 from fspilotshop a couple of days ago. I am running Windows 8.1. There were no issues installing or launching the aircraft, but as I began to fly the aircraft, the frame rates dropped substantially, to the point I could not fly it anymore. I have a high performance computer with a good video card. I can't seem to solve the issue. I tested my other products (such as Carenado's King Air C90) I have purchased that have more demanding frame rates and works just fine (50+ fps). I have already attempted to contact Feelthere for support and they told me to update my video driver. I was able to do so and it never changed anything. I also switched my computer to max performance and still nothing changed.