I set Prepar3D to only use 10 out of 12 of my logical processors, when P3D is loading I get around 80% CPU usage but when I get into the actual simulation the usage plummets to around 20% - 40% and doesn't go any higher. I tried making P3D use all cores, little to no difference.
I know it most likely isn't a bottleneck of any kind since previously I've had P3D V4 run on all cores at 100% CPU usage with fine temperatures and high framerates, only recently it's started doing this.
Specs:
i7-8700k
GTX 1060 6GB
16GB DDR4 3000MHz
250GB SSD
When P3D is in the simulation:
As I said earlier, it can't be a bottleneck since it's been running at 100% before with all cores being used. Doesn't even do that with all cores checked now.