diff --git a/Assets/FlashTools/Scripts/Editor/FTEditor/Editors/SwfManagerEditor.cs b/Assets/FlashTools/Scripts/Editor/FTEditor/Editors/SwfManagerEditor.cs
index e386d59..abf0f7f 100644
--- a/Assets/FlashTools/Scripts/Editor/FTEditor/Editors/SwfManagerEditor.cs
+++ b/Assets/FlashTools/Scripts/Editor/FTEditor/Editors/SwfManagerEditor.cs
@@ -26,6 +26,12 @@ namespace FTEditor.Editors {
 
 		void DrawControls() {
 			SwfEditorUtils.DoRightHorizontalGUI(() => {
+				if ( _manager.useUnscaledDt && GUILayout.Button("Use Scaled Dt") ) {
+					_manager.useUnscaledDt = false;
+				}
+				if ( !_manager.useUnscaledDt && GUILayout.Button("Use Unscaled Dt") ) {
+					_manager.useUnscaledDt = true;
+				}
 				if ( _manager.isPaused && GUILayout.Button("Resume") ) {
 					_manager.Resume();
 				}
@@ -44,11 +50,21 @@ namespace FTEditor.Editors {
 						SwfEditorUtils.DoWithEnabledGUI(false, () => {
 							EditorGUILayout.TextField("Name", group_name);
 						});
-						EditorGUI.BeginChangeCheck();
-						var new_rate_scale = EditorGUILayout.FloatField(
-							"Rate Scale", _manager.GetGroupRateScale(group_name));
-						if ( EditorGUI.EndChangeCheck() ) {
-							_manager.SetGroupRateScale(group_name, new_rate_scale);
+						{
+							EditorGUI.BeginChangeCheck();
+							var new_rate_scale = EditorGUILayout.FloatField(
+								"Rate Scale", _manager.GetGroupRateScale(group_name));
+							if ( EditorGUI.EndChangeCheck() ) {
+								_manager.SetGroupRateScale(group_name, new_rate_scale);
+							}
+						}
+						{
+							EditorGUI.BeginChangeCheck();
+							var new_user_unscaled_dt = EditorGUILayout.Toggle(
+								"Use Unscaled Dt", _manager.IsGroupUseUnscaledDt(group_name));
+							if ( EditorGUI.EndChangeCheck() ) {
+								_manager.SetGroupUseUnscaledDt(group_name, new_user_unscaled_dt);
+							}
 						}
 						SwfEditorUtils.DoRightHorizontalGUI(() => {
 							if ( _manager.IsGroupPaused(group_name) && GUILayout.Button("Resume") ) {
diff --git a/Assets/FlashTools/Scripts/FTRuntime/SwfClipController.cs b/Assets/FlashTools/Scripts/FTRuntime/SwfClipController.cs
index 88bec50..dcb43e1 100644
--- a/Assets/FlashTools/Scripts/FTRuntime/SwfClipController.cs
+++ b/Assets/FlashTools/Scripts/FTRuntime/SwfClipController.cs
@@ -40,6 +40,9 @@ namespace FTRuntime {
 		[SerializeField]
 		bool _autoPlay = true;
 
+		[SerializeField]
+		bool _useUnscaledDt = false;
+
 		[SerializeField, SwfFloatRange(0.0f, float.MaxValue)]
 		float _rateScale = 1.0f;
 
@@ -95,6 +98,15 @@ namespace FTRuntime {
 			set { _autoPlay = value; }
 		}
 
+		/// <summary>
+		/// Gets or sets a value indicating whether controller uses unscaled delta time
+		/// </summary>
+		/// <value><c>true</c> if uses unscaled delta time; otherwise, <c>false</c></value>
+		public bool useUnscaledDt {
+			get { return _useUnscaledDt; }
+			set { _useUnscaledDt = value; }
+		}
+
 		/// <summary>
 		/// Gets or sets the controller rate scale
 		/// </summary>
@@ -296,9 +308,9 @@ namespace FTRuntime {
 		//
 		// ---------------------------------------------------------------------
 
-		internal void Internal_Update(float dt) {
+		internal void Internal_Update(float scaled_dt, float unscaled_dt) {
 			if ( isPlaying ) {
-				_tickTimer += dt;
+				_tickTimer += useUnscaledDt ? unscaled_dt : scaled_dt;
 				do {
 					var frame_rate = clip ? clip.frameRate * rateScale : 0.0f;
 					var frame_time = frame_rate > 0.0f ? 1.0f / frame_rate : 0.0f;
diff --git a/Assets/FlashTools/Scripts/FTRuntime/SwfManager.cs b/Assets/FlashTools/Scripts/FTRuntime/SwfManager.cs
index 63a635f..e54f766 100644
--- a/Assets/FlashTools/Scripts/FTRuntime/SwfManager.cs
+++ b/Assets/FlashTools/Scripts/FTRuntime/SwfManager.cs
@@ -10,8 +10,10 @@ namespace FTRuntime {
 		SwfList<SwfClipController>      _safeUpdates     = new SwfList<SwfClipController>();
 
 		bool                            _isPaused        = false;
+		bool                            _useUnscaledDt   = false;
 		float                           _rateScale       = 1.0f;
 		HashSet<string>                 _groupPauses     = new HashSet<string>();
+		HashSet<string>                 _groupUnscales   = new HashSet<string>();
 		Dictionary<string, float>       _groupRateScales = new Dictionary<string, float>();
 
 		// ---------------------------------------------------------------------
@@ -78,6 +80,15 @@ namespace FTRuntime {
 			set { _isPaused = !value; }
 		}
 
+		/// <summary>
+		/// Get or set a value indicating whether animation updates uses unscaled delta time
+		/// </summary>
+		/// <value><c>true</c> if uses unscaled delta time; otherwise, <c>false</c></value>
+		public bool useUnscaledDt {
+			get { return _useUnscaledDt; }
+			set { _useUnscaledDt = value; }
+		}
+
 		/// <summary>
 		/// Get or set the global animation rate scale
 		/// </summary>
@@ -146,6 +157,30 @@ namespace FTRuntime {
 			return !IsGroupPaused(group_name);
 		}
 
+		/// <summary>
+		/// Set the group of animations use unscaled delta time
+		/// </summary>
+		/// <param name="group_name">Group name</param>
+		/// <param name="yesno"><c>true</c> if group will use unscaled delta time; otherwise, <c>false</c></param>
+		public void SetGroupUseUnscaledDt(string group_name, bool yesno) {
+			if ( !string.IsNullOrEmpty(group_name) ) {
+				if ( yesno ) {
+					_groupUnscales.Add(group_name);
+				} else {
+					_groupUnscales.Remove(group_name);
+				}
+			}
+		}
+
+		/// <summary>
+		/// Determines whether group of animations uses unscaled delta time
+		/// </summary>
+		/// <returns><c>true</c> if group uses unscaled delta time; otherwise, <c>false</c></returns>
+		/// <param name="group_name">Group name</param>
+		public bool IsGroupUseUnscaledDt(string group_name) {
+			return _groupUnscales.Contains(group_name);
+		}
+
 		/// <summary>
 		/// Set the group of animations rate scale
 		/// </summary>
@@ -232,17 +267,19 @@ namespace FTRuntime {
 			}
 		}
 
-		void LateUpdateControllers(float dt) {
+		void LateUpdateControllers(float scaled_dt, float unscaled_dt) {
 			_controllers.AssignTo(_safeUpdates);
 			for ( int i = 0, e = _safeUpdates.Count; i < e; ++i ) {
 				var ctrl = _safeUpdates[i];
 				if ( ctrl ) {
-					var group_name = ctrl.groupName;
+					var group_name  = ctrl.groupName;
 					if ( string.IsNullOrEmpty(group_name) ) {
-						ctrl.Internal_Update(dt);
+						ctrl.Internal_Update(scaled_dt, unscaled_dt);
 					} else if ( IsGroupPlaying(group_name) ) {
 						var group_rate_scale = GetGroupRateScale(group_name);
-						ctrl.Internal_Update(group_rate_scale * dt);
+						ctrl.Internal_Update(
+							group_rate_scale * (IsGroupUseUnscaledDt(group_name) ? unscaled_dt : scaled_dt),
+							group_rate_scale * unscaled_dt);
 					}
 				}
 			}
@@ -267,8 +304,9 @@ namespace FTRuntime {
 
 		void LateUpdate() {
 			if ( isPlaying ) {
-				var dt = Time.deltaTime;
-				LateUpdateControllers(rateScale * dt);
+				LateUpdateControllers(
+					rateScale * (useUnscaledDt ? Time.unscaledDeltaTime : Time.deltaTime),
+					rateScale * Time.unscaledDeltaTime);
 			}
 			LateUpdateClips();
 		}