My parallel cellular automata with Distributed Arrays is very slowly

Hi, I tried to implement a Game Of Life in Julia using the distributed Array and the Distributed library to improve it and make it faster than the sequential version, but althoug I have a quad core i7 CPU the programm is very slowly. Any suggestion?

PS This is the code
https://github.com/dsHitman/juliaProj/blob/master/GOLpar.jl