Weirdly, if I use AM 14, that means Core0 is not used, I get terrible texture loading and very bad performance. Switching to AM 15, meaning Core0 is used, texture loading is fine, and performance seems "ok" for P3D v2. I still get the stutters I was getting in v2.0, I simply leave the sim along, observe, and notice every now and then, a short stutter. It will happen differently, not same time period, not caused by the A/V (which is off btw), simply unexplainable. The same thing was in v2.0, and it wasn't there in 1.4. 1.4 however had other problems, which were "fixed" with the same tweaking as FSX.
However, no fixes proposed still prevent the VAS rise. Even with Autogen on Dense only, I start with VAS of 1700mb, and currently, after some 40min of flight in low and slow Beech Baron, 190kts, the VAS is already at 3250mb. This is a simple takeoff from the default airport, and then due HDG 330 on AP at 2000ft to 8000ft (later on 8000ft, as I come towards mountains).
The most important thing though is to edit out the tower view, which makes the texture reloads really bad, to prevent the unintentional VAS rise. I currently have 3 views only, VC, and two spot. No texture reloads, and still the VAS rise is incredible.