Ok thanks for all the help but I did I clean install of Yosimite and It worked flawlessly Thanks

I think I have plenty of RAM (I have 2 2GB Memory Cards), But the thing I dont get is the Demo runs perfect, and the real game getts like maybe 1 fps...Also I noticed that the menu screen is perfectly fine but when I get into the real game it starts freezing and stuttering.

So I try out the experimental Demo 0.11.8 and it works flawlessly so I decide to buy the game. When I downloaded the same version 0.11.8, I open it up and started to play it and it there was so much lag that its took me a full minute to place down a miner in the correct position. I am on a Mac ...

ssilk wrote:To be serious: that doesn't prove anything.

What do I need to prove? Everyone who uses Mac Yosimite can send you pics and crash reports if you need. Jeez Bro

The demo for factorio is still not working for Mac yosimite, so if you could update the demos that would be greatly appreciated by me and my fellow Yosimite users. Plus I cnat download any of the ezperimental versions because I have not yet bought the game, Whitch is why i want the demo to try out ...