I have not yet used the SBSL with my Orbx scenery in P3D (v1.4). I did in v1.3 and got a good performance, even better than FSx. But my i7 870 still got bogged down in the AU YMML v2 and AU YBBN areas which made me use the default scenery the most. P3D default scenery appears to be better than FSX default scenery (IMO).

But CoolP is right, Orbx released a new library set: ORBXLIBS 120825 Dual Installer Now Available. There is a link in the forum, but not on the FTX Support page (I wonder why?).