So...accordingly to technical support it seems that Photoshop CC doesn't support Intel Iris Graphics... So I spent 1800$ on a retina macbook pro and I have PS which is almost unusable for some tools lag, spot healing brush on top. Is this ever possible!?
I'm sorry you got bad information from tech support.
Photoshop supports any working GPU.
But some older or lower end GPUs won't support some of the more demanding GPU features (3D, OpenCL, etc.) - so those features will be disabled or run slower on GPUs that are not up to the demands.
But most people are not seeing any serious lag with tools. You may want to check your system for other issues (other applications busy in the background, insufficient RAM for your documents, etc.).
I checked everything with the tech support 3times...no luck... And looking around the internet it seems like I'm not the only one with those performance problems! Even after having installed the so from scratch and photoshop the same issues are present!