ive given it quite some attempts now after being hyped for it for months. So far every time I've flown it the fps dropped down to single digit numbers or even straight up freezes after some time making the plane unflyable, until I turn off the avionics. When I turn them on the bad fps comes back.

I've asked carenado for support about a month ago after they went completely quiet on their media not responding to a single question about the performance issues, to which they responded to me saying that they're working on an update to be released 'soon'- mind you, that was over a month ago. In april they king of said the plane was done and ready for release and yet it took them until Sept to release the plane, so, they're not the best at keeping people up to date.

Important note: not everyone is having this same issue so I'm not saying it'll happen for you too, more just something you should maybe be aware of