Here's my specs:
MacBook Pro Retina 2013
Intel i7 2.3GHZ
Intel Iris Pro + nVidia GT750M 2GB
16GB RAM
OS X 10.10 DP3

The game was fine in the previous version of the game, but after updating to 1.0.67 I couldn't launch it anymore from steam (I get a spinning beachball)
The game launches fine if I double click on the bundle inside steam's folder.
After loading my usual save, I got a spinning beachball when the loading screen appeared, and after waiting for a while the game continues to load. Upon entering the game, and outside of any battle, I noticed that the framerate was extremely low (less that half the usual) without changing any graphics settings.

I checked the console and noticed that while the game is running, the console is spammed with the following message:
Code
Jul 12 14:37:32 Thanoss-MacBook-Pro.local WindowServer[110]: Surface testing disallowed updates for 10 sequential attempts...
Jul 12 14:37:32 Thanoss-MacBook-Pro.local WindowServer[110]: Surface test allowed updates after 13 attempts
Jul 12 14:37:32 Thanoss-MacBook-Pro.local WindowServer[110]: Surface testing disallowed updates for 10 sequential attempts...
Jul 12 14:37:32 Thanoss-MacBook-Pro.local WindowServer[110]: Surface test allowed updates after 12 attempts
Jul 12 14:37:32 Thanoss-MacBook-Pro.local WindowServer[110]: Surface testing disallowed updates for 10 sequential attempts...
Jul 12 14:37:32 Thanoss-MacBook-Pro.local WindowServer[110]: Surface test allowed updates after 16 attempts
Jul 12 14:37:32 Thanoss-MacBook-Pro.local WindowServer[110]: Surface testing disallowed updates for 10 sequential attempts...
Jul 12 14:37:33 Thanoss-MacBook-Pro.local WindowServer[110]: Surface test allowed updates after 13 attempts
Jul 12 14:37:38 Thanoss-MacBook-Pro.local WindowServer[110]: Surface testing disallowed updates for 10 sequential attempts...
Jul 12 14:37:38 Thanoss-MacBook-Pro.local WindowServer[110]: Surface test allowed updates after 14 attempts
Jul 12 14:37:38 Thanoss-MacBook-Pro.local WindowServer[110]: Surface testing disallowed updates for 10 sequential attempts...
Jul 12 14:37:38 Thanoss-MacBook-Pro.local WindowServer[110]: Surface test allowed updates after 14 attempts
Jul 12 14:37:38 Thanoss-MacBook-Pro.local WindowServer[110]: Surface testing disallowed updates for 10 sequential attempts...
Jul 12 14:37:38 Thanoss-MacBook-Pro.local WindowServer[110]: Surface test allowed updates after 12 attempts
Jul 12 14:37:38 Thanoss-MacBook-Pro.local WindowServer[110]: Surface testing disallowed updates for 10 sequential attempts...
Jul 12 14:37:38 Thanoss-MacBook-Pro.local WindowServer[110]: Surface test allowed updates after 17 attempts
Jul 12 14:37:39 Thanoss-MacBook-Pro.local WindowServer[110]: Surface testing disallowed updates for 10 sequential attempts...
Jul 12 14:37:39 Thanoss-MacBook-Pro.local WindowServer[110]: Surface test allowed updates after 13 attempts


and keeps going on forever until I quit the game.