[рони]

когда дошло до 5 процентов

Circle._animate = function (options) {
    var start = Date.now(); // сохранить время начала
      requestAnimationFrame(function tick() {
        var timePassed = Date.now() - start;
        var progress = timePassed / options.duration;
        var timeFunction = options.timeFunction || function (progress) {
          return progress;
        };
        progress = progress > 1 ? 1 : progress;
        options.step(timeFunction(progress));
          if(progress !== 1) {
            requestAnimationFrame(tick);
          }
          if (progress > .05 && options.complete) {
            options.complete();
            options.complete = null
          }
      });
  };