Hello
I asked this question over in the ets2 discussions
http://gtm.steamproxy.vip/app/227300/discussions/0/358415738203544291/
only to get a mac hater response. So, I'm going to ask it here.
I'm having problems where if I enter any menu (be it the map, photo mode, pause, main menu, etc) during a job, the frame rate gets all weird. It chokes to an almost crawl, speeds up a million miles, then back to the choke and eventually goes back to normal for a few seconds. Only to do it again. I can quit the game, and relaunch, but as soon as I hit a menu, it starts back up again. I have tried running only steam and ETS2 and changed graphics settings to minimum, no difference. Even tried lower resolutions but that caused everything to be out of focus. Being a Mac, there's no drivers to update.

Macbook Pro OSX 10.10.4
16GB Ram
nVidia 650m/intel HD4000

Ideas?