Alright, time to report on performance during my flight. If ever I was looking for a flight with an OOM, this was it. 14 hours from Dubai to Seattle in a PMDG 777-300ER flown real-time in P3D. I disabled PNW pending a final patch from T2G, but I did have Global+Vector enabled (as of today T2G has apparently been in contact with ORBX to make SEA fully compatible with PNW. See http://www.iflysimx.com/topic/1154-compatibility-with-orbx-pnw/page-2). I had 40% traffic, cloud shadows, scenery nearly all fully to the right, ASN running with overcast skies. I turned on autosave in FSUIPC anticipating an OOM as I started my descent... But the OOM never came! I don't even think I got a single ding warning me of one!
My system is nearly 3 years old with 8GB of RAM, a i5-2500K overclocked to 4.5 GHz, and a GTX 570. OOMs are no foreign thing to my computer, but I was shocked to see Seattle perform so well. Frames hovered in the high teens and low 20s, but it was by no means a slide show. All-in-all I am impressed with what T2G has done with my home airport. There are still a couple wrinkles that need ironing out in terms of its compatibility with ORBX, but this is a top rate scenery!