Great graphics, glitchy under load

Fun game but has a glitch as numbers of units and span of terrain expands. I have a 3.2G Intel i3 IMac (16M ram) and as number of units progress at each level screen goes black and then to the resume/save screen. Sometimes this occurs every couple seconds 4-5 times in a row. Overall fun game somewhat in the genre of Total Annihilation but without the complexity or intriguing story line.

Vinfal about Starfront: Collision