I have been doing some very careful work on the capabilities of this program since I invested in a 5080 and I conclude that indeed there are serious programming defects here (I have written 1000s of lines of code including 20 years in flight simulation).
Bottom Line Up From (BLUF) with the 5080 the simulation can only run at TLOD 150 without serious stuttering on landing when it gets a lot of runway texture to process. This occurs when the GPU and VRAM are still only at 50-70% of capacity. The problem is coming from some errant activity in the CPU.
I do not see this improving until they streamline their code and get it more efficient. I have no idea what they are doing in the CPU but it is not helping the simulation… just a speculation that it involves the downloads from the net as the level of activity varies by day… but that should be cached and not effect speed of processing… I think it is just bad code.