For example, my bring-the-sim-to-its-knees scenario is the PMDG 747, KLAX, weather and at night and I typically got such low FPS it was impossible to actually do in FI without starting to get nauseous. In P3D native, it's incredibly smooth - I dont even notice low FPS.
One thing I will say is at first I noticed very bad stutters. I turned FXAA on and it completely went away. Here are my settings
Cons of P3D
- Some 2D popups dont display in VR - think of the panels in the DC6, or A2A planes where you do things like load fuel, add pax etc.
Mouse interaction could be better - if I right-click on a switch but it's not on top of the switch it opens the context menu but that's not visible in VR
No importable windows - I used to print a tripkit of charts and my flight plan as a PDF and import it into FI but it's honestly been so long since I did that I dont really worry. I keep reading the Oculus has a tool that can bring windows in like FI does but I've not tried it yet.
Small things - FI has some great features that I will miss but at this point the greatly increased performance is enough to counter the missing features.