code: function() {
                      if(_loopingInstances[_strLength] > 0 && _loopIsActive) {
                          _loopID = COMPATIBILITY.rAF()(function () {
                              loop();
                          });
                          var timeNew = COMPATIBILITY.now();
                          var timeDelta = timeNew - _loopTimeOld;
                          var lowestInterval;
                          var instance;
                          var instanceOptions;
                          var instanceAutoUpdateAllowed;
                          var instanceAutoUpdateInterval;
                          var now;
  
                          if (timeDelta > _loopInterval) {
                              _loopTimeOld = timeNew - (timeDelta % _loopInterval);
                              lowestInterval = _loopIntervalDefault;
                              for(var i = 0; i < _loopingInstances[_strLength]; i++) {
                                  instance = _loopingInstances[i];
                                  if (instance !== undefined) {
                                      instanceOptions = instance.options();
                                      instanceAutoUpdateAllowed = instanceOptions[_strAutoUpdate];
                                      instanceAutoUpdateInterval = MATH.max(1, instanceOptions[_strAutoUpdateInterval]);
                                      now = COMPATIBILITY.now();
  
                                      if ((instanceAutoUpdateAllowed === true || instanceAutoUpdateAllowed === null) && (now - _loopingInstancesIntervalCache[i]) > instanceAutoUpdateInterval) {
                                          instance.update('auto');
                                          _loopingInstancesIntervalCache[i] = new Date(now += instanceAutoUpdateInterval);
                                      }
  
                                      lowestInterval = MATH.max(1, MATH.min(lowestInterval, instanceAutoUpdateInterval));
                                  }
                              }
                              _loopInterval = lowestInterval;
                          }
                      } else {
                          _loopInterval = _loopIntervalDefault;
                      }
                  }
docs: The auto update loop which will run every 50 milliseconds or less if the update interval of a instance is lower than 50 milliseconds.