Okay I have a little good news to report on this.
For
me, so far, Nvidia GeForce drivers 497.07 (Dec. 1) appear to have stabilized framerate outdoors. I'm now running full Ultra everything and easily sustaining 120fps smooth, but I've only run around a little bit so far. But it looks
way better.
Also, per
Tom's benchmark article on the game, enabling Asynch Compute in the settings may have also helped, but I tested that before upgrading the drivers and at that time it didn't seem to do anything.
Anyone else also morbidly curious about the performance of this turd like I am, see if you're experiencing the same gains by upgrading to 497.07. I fully recommend a proper
DDU cleaning first.
Full disclosure: I've done just about everything else to my system to optimize for performance, including enabling Resizeable BAR, etc., so your mileage may vary.
Update: Okay, it's definitely much better with 497.07, but still far from perfect. The very weird thing is that just looking in different directions outdoors can still cause the framerate (for me) to dip to about 105 for a moment, but then it almost always pops right back up to 120. Running around still causes the maddening frame skipping issues and those are still present in any cutscene.
It's really weird because clearly the engine is capable of sustaining constant framerate, but something's going on that keeps interrupting it. It reminds me of the problems that Rage had when it was first released, which were never really solved.
This game really needs a performance patch.