Operating system: Windows-10-10.0.16299 64 Bits
Graphics card: GeForce GTX 770/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.15
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: rBf6cb5f54494e
Short description of error
All rendering done with the cycles engine has been much slower in 2.8 than it was in 2.79. A quick test using suzanne and simple AO baking put the 2.8 render at about 1/4th the speed of the 2.79 render. This is consistent with normal render results I've been getting since the update.
Should also mention that during GPU rendering in 2.8, CPU usage shoots up to 100% while GPU usage hovers around 15-20%. In 2.79, CPU usage hovers around 35-40% and GPU usage shoots up to 20% when the bake starts and then drops back down.