the game unturned is running with low fps. I have a late 2011 MacBook pro. 2.4ghz cpu i5.
intel hd 3000, 512mb. with bloom and light shafts I'm getting about 29fps. when I turn up the detail distance it drops to 6fps. clearly 2.4ghz is fast enough not to do this.
Yes. Its your graphics hardware, not the CPUs. A 2.4 i5 will be perfectly adequate with a decent graphics card. One of my machines has HD3000 graphics. Its fine for ordinary "business" use, but hopeless for real-time 3d games.