P3D v5.1 + HF1 with SteamVR: Affinity Mask?

[Airtrooper]

I'm using P3D v5.1 + HF1 with a Reverb G2 via SteamVR (I'm assuming that is the correct combination?!). P3D seems to use all cores pretty heavily, but especially #0. Running SteamVR brings P3D performance down to single-digit FPS, even before entering VR in the sim. I was wondering if 1) others are experiencing the same; 2) this could be due to StreamVR also hitting #0 hard; and therefore 3) is AffinityMask recommended to help spread the load? Right now core #0 is frequently hitting 100%, which I figure must be the cause of the terrible FPS.

Many thanks again :-)

Andy