Did you read the performance tips?[1] The mailing list is pretty good at helping with problems like that. Using global variables is a pretty common performance

Did you read the performance tips?[1] The mailing list is pretty good at helping with problems like that. Using global variables is a pretty common performance killer. [1] http://julia.readthedocs.org/en/latest/manual/performance-tips/ http://julia.readthedocs.org/en/latest/manual/performance-ti... edit: As a direct reply to your question, yes, lots of people fail to find performance improvements when they first port code to Julia. But they often discover those improvements 10 minutes after someone with more Julia experience looks over their code :)