Cloud computing and multi-core processors will change the way we program and use computer. This paper describes the benefits that cloud computing can obtain from optimized communications by parallel genetic algorithms. Chips with multi-core processors are very current and the performances of theirs applications depend a lot on their performances of communication between each process and applications. We show that how the performances could be easily multiplied by two with an optimization by parallel genetic algorithms. We applies this method for the Intel's single-chip cloud computer (SCC), a 48- core processor. This method could be applied to all cloud computers.