Bad performance on Mac OS 10.13.6

Upgraded to Mac OSX 10.13.6 last week and been having graphics card performance issues ever since. Slowed down computer, ghosting of windows when dragged around desktop, very poor performance of DaVinci Resolve.

I’m at 10.13.6 (17G7024), NVidia web driver 387. (released today, May 15th) and CUDA 418.163. Experiencing the same issue with GTX 680 and GTX 780, both flashed for Mac. Cards are in a MacPro 5,1.

When using default macOS Graphics Driver system performance is stellar but there’s no access to CUDA cards in the Xpander breakout box (two Titan X cards) so not a solution at all.

It used to be possible to run CUDA without the NVidia web driver but I may be wrong about that.

Any ideas on a fix? Computer and studio are grinding to a halt.

I am experiencing the exact same issue after accidentally updating my OS. No solution yet, but I’m going to track this hoping for help.