So it seems that someone screwed the pooch with the updates for 3.1.
No idea what is what yet, but fewer Graphics Options, went from getting 45-50FPS full graphics/full res shaders at 4K @60Hz in BR3 to 15-20FPS average -- lowest graphics, 1/4 res shaders, in 2K scaled down to 1080p @60hz (the only setting I got more than 8-12FPS) in BR3.1. The world looks like an ugly bright green lump of clay and my machine seems like it's about to catch fire! ROFL! Also, this was without ANY females nearby in 3.1, they just never happened past, whereas the BR3 observation was over weeks of play in all facets of the game.
Went through and reconfigured everything (that I could) identically to BR3, including graphics card options etc., cleared cache, cleaned registry, etc., nothing is fixing it as of yet.