just used this for profiling jasmine specs (trying to isolate slow specs)

profile.js

//outside of any describe() block so they run for every single spec.

  beforeEach(function() {
    window.timings = window.timings || []
    timings.push({
      startTime: new Date(),
      spec: this
    });
  });
  afterEach(function() {
    _(timings).last()["endTime"] = new Date();
  });


//laster from the browser console (using Underscore.js)
_(timings).sortBy(function(timing){ timing.elapsedMs = timing.endTime - timing.startTime; return timing.elapsedMs; });

//^ the above results will be sorted fastest-to-slowest