Would it be possible to update node.js to v4.0.0 and rerun the Express Cluster benchmark? node.js v0.12.x was slower than v.0.10.x, while v4.0.0 is supposed to be faster than both. Sorry for making this request if it's out of your field of interest, but couldn't resist asking :)

EDIT: My mistake, I thought you were the author of the benchmark