So I just downloaded the Bespin maps to try them out and the performance is AWFUL on them. I only get about 60% GPU usage on each of my two cards and a stuttery framerate in the 40s. The rest of the game runs beautifully by comparison... 100% GPU usage and 80-100 fps.

This is at 4k resolution and Ultra settings with the following setup:

Windows 10 x64

2x Titan X clocked at 1450/8000

i7 5930k at 4.5 GHz

32GB RAM at 2666 MHz

newest Nvidia drivers (368.39)

Gotta be a bug in the new Bespin update since the rest of the game runs great

-EDIT- After testing on both 368.39 and the new 368.69, I can confirm that this appears to be an issue only with SLI. When SLI is disabled, performance is fine (~50-60fps average) and GPU usage is fine. Performance is worse and GPU usage is bugged in SLI on Bespin maps only.

-Edit 2- Neither the new July driver (368.81) nor the July 21 patch improved or changed the problem at all. I've clean formatted my system and that didn't solve anything either.