Homespun JavaScript profiling

profile-loop.js

for (
    var start = new Date().getTime(),
        iterationCount = 0,
        millisec = 0;
    millisec < 1000;
    iterationCount++
) {
    // Your profiled code
    // goes here

    millisec = new Date().getTime() - start;
}
// iterationCount tells you how it performed
// in comparison to something else.
// The higher the number, the better!