Thanks for your reports! I’ve actually seen one other report of this happening for Diablo III and Mojave specifically.
Our other games (Starcraft II & Heroes of the Storm, specifically) have had issues with Radeon graphics due to a driver issue on Catalina that will be fixed with a driver update in the future. This is mostly why I tied this with possibly some driver issues, but it seems more like Diablo III and MacOS may not be detecting and keeping the automatic switching set properly as Chocopipe pointed out.
With also having reports on Mojave though, I’m a bit curious if there’s something else to this. Anyone having success with disabling Automatic Switching for the GPU as well?
Thanks folks! I’m going to get this tracked and gathered, any additional reports and success on if this works for you is appreciated 