async.sortBy is for sorting the results of an array of asynchronous functions. It is not an asynchronous sort. Let's see how it fares with process.nextTick(func

async.sortBy is for sorting the results of an array of asynchronous functions. It is not an asynchronous sort. Let's see how it fares with process.nextTick(function(){array.sort()}) (or better still, threads-a-gogo).