For years I was hoping the Mac version would get Retina support. Well, “be careful what you wish for” apparently applies because the latest update runs really bad. I have a 2017 MacBook Pro, fully maxed, and a 2014 iMac 5K with i7. Apparently neither of them are up to the task of running Hearthstone on High settings any more. The frame rate drops, everything is stuttery and laggy. Not fun. If there were a way to turn it back to non-retina, keeping the same apparently screen size, I’d do it in a heartbeat. Is this being looked at?
I think this is what you are looking for.