Hey there, @becks1112 - I know you have been away from us for a while. One thing that has happened, besides TS3 for Mac becoming more of a mess to get installed and running than it ever was, is that Apple released a new product line of what they call MacBooks (not MacBook Pros) that are nothing like the regular MacBooks of prior years. These devices cannot run TS3 and if you force even the base game on them, they will likely overheat on you -- they have no real cooling system besides being too weak on the other specs.
Basically I'm agreeing with @puzzlezaddict - you can't really sim or play any graphics intensive games on those devices. They are more powerful than tablets but not built to withstand too much more stress than say an iPad can. Their strengths are super lightweight portability and performing very light office and web/cloud based tasks more so than running games and other intensive programs.