OK, started using the Steam for "M" series Mac beta about a month ago, worked smashingly for the few games I can play (many mac games aren't 64 bit :/ ) anyway, today I upgraded and am trying the new Mac OS Tahoe Beta.. All I have tested so far is Borderlands as it's the only one I have currently that will run, but.... every thing is SOOOO slow!! loading used to be wicked fast, starting and loading the app, going to different screens, was WAY faster than on like PS4 or Xbox was... but now, start up/loading lags BAD! like minutes! trying to save and quit takes literally over a minute, it's like the app/game crashes. Now, I have no idea if it's the Mac Beta or the Steam beta.. or both mixed? but figured I'd mention it and see if anyone can get more info/ figure it out.