diff --git a/OngekiFumenEditor/Base/Collections/SoflanList_CachedPositionList.cs b/OngekiFumenEditor/Base/Collections/SoflanList_CachedPositionList.cs
index 243c8970..9034b3eb 100644
--- a/OngekiFumenEditor/Base/Collections/SoflanList_CachedPositionList.cs
+++ b/OngekiFumenEditor/Base/Collections/SoflanList_CachedPositionList.cs
@@ -54,7 +54,7 @@ public enum ChgEvt
 		public IEnumerable<(TGrid TGrid, double speed, BPMChange curBpm, ChgEvt)> GetCalculatableEvents(BpmList bpmList, bool isDesignModel)
 		{
 			var curBpm = bpmList.FirstBpm;
-			KeyframeSoflan curSpeedEvent = null;
+			IKeyframeSoflan curSpeedEvent = null;
 
 			IEnumerable<(TGrid TGrid, double speed, BPMChange curBpm, ChgEvt evt)> GetEventTimings(ITimelineObject evt)
 			{
@@ -66,17 +66,34 @@ public enum ChgEvt
 						var speed = (curSpeedEvent is not null && curSpeedEvent.EndTGrid > t) ? (isDesignModel ? curSpeedEvent.SpeedInEditor : curSpeedEvent.Speed) : 1.0d;
 						yield return (evt.TGrid, speed, curBpm, ChgEvt.BpmChanged);
 						break;
-					case KeyframeSoflan soflanEvt:
+					case IKeyframeSoflan soflanEvt:
 						curSpeedEvent = soflanEvt;
 						yield return (evt.TGrid, (isDesignModel ? soflanEvt.SpeedInEditor : soflanEvt.Speed), curBpm, ChgEvt.SoflanChanged);
 						break;
+					case IDurationSoflan durationEvt:
+						var itor = durationEvt.GenerateKeyframeSoflans().GetEnumerator();
+						if (itor.MoveNext())
+						{
+							curSpeedEvent = itor.Current;
+							yield return (itor.Current.TGrid, (isDesignModel ? itor.Current.SpeedInEditor : itor.Current.Speed), curBpm, ChgEvt.SoflanBegan);
+							if (itor.MoveNext())
+							{
+								var prev = itor.Current;
+								while (itor.MoveNext())
+								{
+									//process prev
+									yield return (itor.Current.TGrid, (isDesignModel ? itor.Current.SpeedInEditor : itor.Current.Speed), curBpm, ChgEvt.SoflanChanged);
+									//set prev
+									prev = itor.Current;
+								}
+								curSpeedEvent = itor.Current;
+								yield return (itor.Current.TGrid, (isDesignModel ? itor.Current.SpeedInEditor : itor.Current.Speed), curBpm, ChgEvt.SoflanEnded);
+							}
+						}
+						break;
 				}
 			}
-			var r = this.SelectMany(x => x switch
-			{
-				IKeyframeSoflan t => Enumerable.Repeat(x, 1),
-				IDurationSoflan t => t.GenerateKeyframeSoflans()
-			})
+			var r = this
 				.FilterNull()
 				.AsEnumerable<ITimelineObject>()
 				.Concat(bpmList)
diff --git a/OngekiFumenEditor/Base/ISoflan.cs b/OngekiFumenEditor/Base/ISoflan.cs
index fe783b7d..b7696bc5 100644
--- a/OngekiFumenEditor/Base/ISoflan.cs
+++ b/OngekiFumenEditor/Base/ISoflan.cs
@@ -12,6 +12,8 @@ public interface ISoflan : ITimelineObject, INotifyPropertyChanged, IDisplayable
 		float Speed { get; set; }
 		bool ApplySpeedInDesignMode { get; set; }
 
+		public float SpeedInEditor => ApplySpeedInDesignMode ? Speed : Math.Abs(Speed);
+
 		TGrid EndTGrid { get; set; } // 考虑到SoflanList的间隔树使用
 	}
 }