I’ve always run WoW on a Mac. Both iMac & Air. Still do. And it’s always run great. There was one weird week during Legion when after a patch update where it got glitchy in Suramar on my Air, but the Mac update fixed it. I can’t remember… Yosemite maybe?
Right now I’m running only on my 2017 iMac, running Mojave still, 32gb, (apologies for spacing on the graphics card, but I’m in a nice 
and don’t feel like jumping out to look.) I just haven’t had a reason to play it on my Air since 8.3.
It runs great. What Mac are you running it on, and what are your specs?
And to all the Mac-challenged responders: Stop talking. You’ll look less foolish.
Professional animators and filmmakers edit and render on Macs.
I worked for three software (two gaming) companies in tech support and QA Testing. The problems were always on the Windows side, not Mac.
WoW runs great on a Mac.