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				@@ -3131,7 +3131,7 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons 
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				 var HASH_CHANGE_TIMEOUT = 1000; 
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				 var POSITION_UPDATED_THRESHOLD = 50; 
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				-var UPDATE_VIEWAREA_TIMEOUT = 2000; 
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				+var UPDATE_VIEWAREA_TIMEOUT = 1000; 
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				 function getCurrentHash() { 
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				   return document.location.hash; 
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				 } 
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				@@ -3225,6 +3225,8 @@ var PDFHistory = function () { 
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				   }, { 
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				     key: 'push', 
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				     value: function push(_ref2) { 
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				+      var _this2 = this; 
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				+ 
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				       var namedDest = _ref2.namedDest, 
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				           explicitDest = _ref2.explicitDest, 
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				           pageNumber = _ref2.pageNumber; 
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				@@ -3255,6 +3257,12 @@ var PDFHistory = function () { 
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				         hash: hash, 
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				         page: pageNumber 
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				       }, forceReplace); 
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				+      if (!this._popStateInProgress) { 
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				+        this._popStateInProgress = true; 
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				+        Promise.resolve().then(function () { 
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				+          _this2._popStateInProgress = false; 
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				+        }); 
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				+      } 
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				     } 
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				   }, { 
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				     key: 'pushCurrentPosition', 
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				@@ -3362,6 +3370,10 @@ var PDFHistory = function () { 
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				     value: function _updateInternalState(destination, uid) { 
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				       var removeTemporary = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false; 
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				+      if (this._updateViewareaTimeout) { 
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				+        clearTimeout(this._updateViewareaTimeout); 
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				+        this._updateViewareaTimeout = null; 
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				+      } 
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				       if (removeTemporary && destination && destination.temporary) { 
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				         delete destination.temporary; 
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				       } 
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				@@ -3373,7 +3385,7 @@ var PDFHistory = function () { 
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				   }, { 
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				     key: '_updateViewarea', 
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				     value: function _updateViewarea(_ref3) { 
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				-      var _this2 = this; 
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				+      var _this3 = this; 
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				       var location = _ref3.location; 
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				@@ -3394,17 +3406,17 @@ var PDFHistory = function () { 
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				       } 
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				       if (UPDATE_VIEWAREA_TIMEOUT > 0) { 
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				         this._updateViewareaTimeout = setTimeout(function () { 
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				-          if (!_this2._popStateInProgress) { 
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				-            _this2._tryPushCurrentPosition(true); 
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				+          if (!_this3._popStateInProgress) { 
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				+            _this3._tryPushCurrentPosition(true); 
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				           } 
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				-          _this2._updateViewareaTimeout = null; 
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				+          _this3._updateViewareaTimeout = null; 
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				         }, UPDATE_VIEWAREA_TIMEOUT); 
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				       } 
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				     } 
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				   }, { 
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				     key: '_popState', 
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				     value: function _popState(_ref4) { 
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				-      var _this3 = this; 
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				+      var _this4 = this; 
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				       var state = _ref4.state; 
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				@@ -3435,25 +3447,9 @@ var PDFHistory = function () { 
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				           name: 'hashchange', 
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				           delay: HASH_CHANGE_TIMEOUT 
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				         }).then(function () { 
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				-          _this3._blockHashChange--; 
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				+          _this4._blockHashChange--; 
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				         }); 
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				       } 
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				-      if (state.uid < this._currentUid && this._position && this._destination) { 
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				-        var shouldGoBack = false; 
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				-        if (this._destination.temporary) { 
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				-          this._pushOrReplaceState(this._position); 
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				-          shouldGoBack = true; 
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				-        } else if (this._destination.page && this._destination.page !== this._position.first && this._destination.page !== this._position.page) { 
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				-          this._pushOrReplaceState(this._destination); 
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				-          this._pushOrReplaceState(this._position); 
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				-          shouldGoBack = true; 
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				-        } 
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				-        if (shouldGoBack) { 
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				-          this._currentUid = state.uid; 
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				-          window.history.back(); 
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				-          return; 
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				-        } 
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				-      } 
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				       var destination = state.destination; 
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				       this._updateInternalState(destination, state.uid, true); 
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				       if (destination.dest) { 
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				@@ -3464,13 +3460,13 @@ var PDFHistory = function () { 
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				         this.linkService.page = destination.page; 
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				       } 
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				       Promise.resolve().then(function () { 
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				-        _this3._popStateInProgress = false; 
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				+        _this4._popStateInProgress = false; 
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				       }); 
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				     } 
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				   }, { 
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				     key: '_bindEvents', 
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				     value: function _bindEvents() { 
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				-      var _this4 = this; 
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				+      var _this5 = this; 
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				       var _boundEvents = this._boundEvents, 
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				           eventBus = this.eventBus; 
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				@@ -3478,8 +3474,8 @@ var PDFHistory = function () { 
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				       _boundEvents.updateViewarea = this._updateViewarea.bind(this); 
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				       _boundEvents.popState = this._popState.bind(this); 
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				       _boundEvents.pageHide = function (evt) { 
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				-        if (!_this4._destination) { 
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				-          _this4._tryPushCurrentPosition(); 
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				+        if (!_this5._destination) { 
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				+          _this5._tryPushCurrentPosition(); 
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				         } 
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				       }; 
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				       eventBus.on('updateviewarea', _boundEvents.updateViewarea); 
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