It's most disappointing to see that LR/Adobe still can't figure out how to make GPU acceleration work in LR. I agree with the latest version if you have an nvidia card, mine are GX970's and if you enable GPU acceleration the program becomes very unstable.
Throughout it's history LR has IMO never really worked well with GPU/open CL and I have always ended up turning it off. I find it strange that Adobe can't figure this out as the GPU support in Photoshop CC works very well and you can clearly see an improvement in performance with it enabled.
It also seems to be something to do with Nvidia and LR and windows at least for my work. On the Mac, enabling GPU support has no problems and does seem to make an improvement in performance.
Windows 10, 64 GB of ram, Catalog on SSD For PC
Mac is Sierra, 64GB of ram, SSD for OS, catalog on same SSD.
Paul Caldwell