code: function () {
      ++this.count;
      if (this.t0 === null) {
        this.start();
        return;
      }
      var elapsed = this._elapsed();
      if (elapsed > 1) {
        Profiler.new_value(this.name, this.count);
        this.count = 0;
        this.start();
      }
    }
docs: measures how many times per second this function is called