diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Bone.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Bone.java
index 9254b9c84..82bffa40c 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Bone.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Bone.java
@@ -65,12 +65,4 @@ public class Bone extends PosedActive<BoneData, BoneLocal, BonePose> {
 	public Array<Bone> getChildren () {
 		return children;
 	}
-
-	void resetUpdate (Skeleton skeleton) {
-		if (applied.world != skeleton.update) return;
-		applied.world = 0;
-		Bone[] children = this.children.items;
-		for (int i = 0, n = this.children.size; i < n; i++)
-			children[i].resetUpdate(skeleton);
-	}
 }
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/BonePose.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/BonePose.java
index 38ff9cf62..555cebf5e 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/BonePose.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/BonePose.java
@@ -139,8 +139,8 @@ public class BonePose extends BoneLocal implements Update {
 	 * Some information is ambiguous in the world transform, such as -1,-1 scale versus 180 rotation. The local transform after
 	 * calling this method is equivalent to the local transform used to compute the world transform, but may not be identical. */
 	public void updateLocalTransform (Skeleton skeleton) {
-		world = skeleton.update;
 		local = 0;
+		world = skeleton.update;
 
 		if (bone.parent == null) {
 			x = worldX - skeleton.x;
@@ -219,10 +219,33 @@ public class BonePose extends BoneLocal implements Update {
 		}
 	}
 
-	/** When true, the world transform has been modified and the local transform no longer matches. Call
-	 * {@link #updateLocalTransform(Skeleton)} before using the local transform. */
-	public boolean isLocalDirty (Skeleton skeleton) {
-		return local == skeleton.update;
+	/** If the world transform has been modified and the local transform no longer matches, {@link #updateLocalTransform(Skeleton)}
+	 * is called. */
+	public void validateLocalTransform (Skeleton skeleton) {
+		if (local == skeleton.update) updateLocalTransform(skeleton);
+	}
+
+	void modifyLocal (Skeleton skeleton) {
+		if (local == skeleton.update) updateLocalTransform(skeleton);
+		world = 0;
+		resetWorld(skeleton.update);
+	}
+
+	void modifyWorld (int update) {
+		local = update;
+		world = update;
+		resetWorld(update);
+	}
+
+	void resetWorld (int update) {
+		Bone[] children = bone.children.items;
+		for (int i = 0, n = bone.children.size; i < n; i++) {
+			BonePose child = children[i].applied;
+			if (child.world == update) {
+				child.world = 0;
+				child.resetWorld(update);
+			}
+		}
 	}
 
 	/** Part of the world transform matrix for the X axis. If changed, {@link #updateLocalTransform(Skeleton)} should be called. */
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java
index 11508ed58..82ef24230 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java
@@ -76,19 +76,12 @@ public class IkConstraint extends Constraint<IkConstraint, IkConstraintData, IkC
 	void sort (Skeleton skeleton) {
 		skeleton.sortBone(target);
 		Bone parent = bones.items[0].bone;
-		skeleton.resetCache(parent);
 		skeleton.sortBone(parent);
-		if (bones.size == 1) {
-			skeleton.updateCache.add(this);
-			skeleton.sortReset(parent.children);
-		} else {
-			Bone child = bones.items[1].bone;
-			skeleton.resetCache(child);
-			skeleton.sortBone(child);
-			skeleton.updateCache.add(this);
-			skeleton.sortReset(parent.children);
-			child.sorted = true;
-		}
+		skeleton.updateCache.add(this);
+		parent.sorted = false;
+		skeleton.sortReset(parent.children);
+		skeleton.constrained(parent);
+		if (bones.size > 1) skeleton.constrained(bones.items[1].bone);
 	}
 
 	boolean isSourceActive () {
@@ -112,9 +105,9 @@ public class IkConstraint extends Constraint<IkConstraint, IkConstraintData, IkC
 
 	/** Applies 1 bone IK. The target is specified in the world coordinate system. */
 	static public void apply (Skeleton skeleton, BonePose bone, float targetX, float targetY, boolean compress, boolean stretch,
-		boolean uniform, float alpha) {
+		boolean uniform, float mix) {
 		if (bone == null) throw new IllegalArgumentException("bone cannot be null.");
-		if (bone.local == skeleton.update) bone.updateLocalTransform(skeleton);
+		bone.modifyLocal(skeleton);
 		BonePose p = bone.bone.parent.applied;
 		float pa = p.a, pb = p.b, pc = p.c, pd = p.d;
 		float rotationIK = -bone.shearX - bone.rotation, tx, ty;
@@ -148,7 +141,7 @@ public class IkConstraint extends Constraint<IkConstraint, IkConstraintData, IkC
 			rotationIK -= 360;
 		else if (rotationIK < -180) //
 			rotationIK += 360;
-		bone.rotation += rotationIK * alpha;
+		bone.rotation += rotationIK * mix;
 		if (compress || stretch) {
 			switch (bone.inherit) {
 			case noScale, noScaleOrReflection -> {
@@ -160,25 +153,23 @@ public class IkConstraint extends Constraint<IkConstraint, IkConstraintData, IkC
 			if (b > 0.0001f) {
 				float dd = tx * tx + ty * ty;
 				if ((compress && dd < b * b) || (stretch && dd > b * b)) {
-					float s = ((float)Math.sqrt(dd) / b - 1) * alpha + 1;
+					float s = ((float)Math.sqrt(dd) / b - 1) * mix + 1;
 					bone.scaleX *= s;
 					if (uniform) bone.scaleY *= s;
 				}
 			}
 		}
-		bone.updateWorldTransform(skeleton);
-		bone.bone.resetUpdate(skeleton);
 	}
 
 	/** Applies 2 bone IK. The target is specified in the world coordinate system.
 	 * @param child A direct descendant of the parent bone. */
 	static public void apply (Skeleton skeleton, BonePose parent, BonePose child, float targetX, float targetY, int bendDir,
-		boolean stretch, boolean uniform, float softness, float alpha) {
+		boolean stretch, boolean uniform, float softness, float mix) {
 		if (parent == null) throw new IllegalArgumentException("parent cannot be null.");
 		if (child == null) throw new IllegalArgumentException("child cannot be null.");
 		if (parent.inherit != Inherit.normal || child.inherit != Inherit.normal) return;
-		if (parent.local == skeleton.update) parent.updateLocalTransform(skeleton);
-		if (child.local == skeleton.update) child.updateLocalTransform(skeleton);
+		parent.modifyLocal(skeleton);
+		child.modifyLocal(skeleton);
 		float px = parent.x, py = parent.y, psx = parent.scaleX, psy = parent.scaleY, csx = child.scaleX;
 		int os1, os2, s2;
 		if (psx < 0) {
@@ -218,10 +209,8 @@ public class IkConstraint extends Constraint<IkConstraint, IkConstraintData, IkC
 		float dx = (x * d - y * b) * id - px, dy = (y * a - x * c) * id - py;
 		float l1 = (float)Math.sqrt(dx * dx + dy * dy), l2 = child.bone.data.length * csx, a1, a2;
 		if (l1 < 0.0001f) {
-			apply(skeleton, parent, targetX, targetY, false, stretch, false, alpha);
+			apply(skeleton, parent, targetX, targetY, false, stretch, false, mix);
 			child.rotation = 0;
-			child.updateWorldTransform(skeleton);
-			child.bone.resetUpdate(skeleton);
 			return;
 		}
 		x = targetX - pp.worldX;
@@ -250,7 +239,7 @@ public class IkConstraint extends Constraint<IkConstraint, IkConstraintData, IkC
 				cos = 1;
 				a2 = 0;
 				if (stretch) {
-					a = ((float)Math.sqrt(dd) / (l1 + l2) - 1) * alpha + 1;
+					a = ((float)Math.sqrt(dd) / (l1 + l2) - 1) * mix + 1;
 					parent.scaleX *= a;
 					if (uniform) parent.scaleY *= a;
 				}
@@ -315,15 +304,12 @@ public class IkConstraint extends Constraint<IkConstraint, IkConstraintData, IkC
 			a1 -= 360;
 		else if (a1 < -180) //
 			a1 += 360;
-		parent.rotation += a1 * alpha;
-		parent.updateWorldTransform(skeleton);
+		parent.rotation += a1 * mix;
 		a2 = ((a2 + os) * radDeg - child.shearX) * s2 + os2 - child.rotation;
 		if (a2 > 180)
 			a2 -= 360;
 		else if (a2 < -180) //
 			a2 += 360;
-		child.rotation += a2 * alpha;
-		child.updateWorldTransform(skeleton);
-		parent.bone.resetUpdate(skeleton);
+		child.rotation += a2 * mix;
 	}
 }
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PathConstraint.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PathConstraint.java
index dab82c1a1..e9458fd26 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PathConstraint.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PathConstraint.java
@@ -152,7 +152,7 @@ public class PathConstraint extends Constraint<PathConstraint, PathConstraintDat
 			BonePose p = slot.bone.applied;
 			offsetRotation *= p.a * p.d - p.b * p.c > 0 ? degRad : -degRad;
 		}
-		for (int i = 0, p = 3; i < boneCount; i++, p += 3) {
+		for (int i = 0, p = 3, u = skeleton.update; i < boneCount; i++, p += 3) {
 			BonePose bone = bones[i];
 			bone.worldX += (boneX - bone.worldX) * mixX;
 			bone.worldY += (boneY - bone.worldY) * mixY;
@@ -196,8 +196,7 @@ public class PathConstraint extends Constraint<PathConstraint, PathConstraintDat
 				bone.c = sin * a + cos * c;
 				bone.d = sin * b + cos * d;
 			}
-			bone.local = skeleton.update;
-			bone.bone.resetUpdate(skeleton);
+			bone.modifyWorld(u);
 		}
 	}
 
@@ -462,16 +461,16 @@ public class PathConstraint extends Constraint<PathConstraint, PathConstraintDat
 	void sort (Skeleton skeleton) {
 		int slotIndex = slot.getData().index;
 		Bone slotBone = slot.bone;
-		if (skeleton.skin != null) sortPathConstraintAttachment(skeleton, skeleton.skin, slotIndex, slotBone);
+		if (skeleton.skin != null) sortPathSlot(skeleton, skeleton.skin, slotIndex, slotBone);
 		if (skeleton.data.defaultSkin != null && skeleton.data.defaultSkin != skeleton.skin)
-			sortPathConstraintAttachment(skeleton, skeleton.data.defaultSkin, slotIndex, slotBone);
-		sortPathConstraintAttachment(skeleton, slot.pose.attachment, slotBone);
+			sortPathSlot(skeleton, skeleton.data.defaultSkin, slotIndex, slotBone);
+		sortPath(skeleton, slot.pose.attachment, slotBone);
 		BonePose[] bones = this.bones.items;
 		int boneCount = this.bones.size;
 		for (int i = 0; i < boneCount; i++) {
 			Bone bone = bones[i].bone;
-			skeleton.resetCache(bone);
 			skeleton.sortBone(bone);
+			skeleton.constrained(bone);
 		}
 		skeleton.updateCache.add(this);
 		for (int i = 0; i < boneCount; i++)
@@ -480,15 +479,15 @@ public class PathConstraint extends Constraint<PathConstraint, PathConstraintDat
 			bones[i].bone.sorted = true;
 	}
 
-	private void sortPathConstraintAttachment (Skeleton skeleton, Skin skin, int slotIndex, Bone slotBone) {
+	private void sortPathSlot (Skeleton skeleton, Skin skin, int slotIndex, Bone slotBone) {
 		Object[] entries = skin.attachments.orderedItems().items;
 		for (int i = 0, n = skin.attachments.size; i < n; i++) {
 			var entry = (SkinEntry)entries[i];
-			if (entry.slotIndex == slotIndex) sortPathConstraintAttachment(skeleton, entry.attachment, slotBone);
+			if (entry.slotIndex == slotIndex) sortPath(skeleton, entry.attachment, slotBone);
 		}
 	}
 
-	private void sortPathConstraintAttachment (Skeleton skeleton, Attachment attachment, Bone slotBone) {
+	private void sortPath (Skeleton skeleton, Attachment attachment, Bone slotBone) {
 		if (!(attachment instanceof PathAttachment pathAttachment)) return;
 		int[] pathBones = pathAttachment.getBones();
 		if (pathBones == null)
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraint.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraint.java
index ee625fb5a..579dc1b0d 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraint.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraint.java
@@ -263,16 +263,15 @@ public class PhysicsConstraint extends Constraint<PhysicsConstraint, PhysicsCons
 			tx = l * bone.a;
 			ty = l * bone.c;
 		}
-		bone.local = skeleton.update;
-		bone.bone.resetUpdate(skeleton);
+		bone.modifyWorld(skeleton.update);
 	}
 
 	void sort (Skeleton skeleton) {
 		Bone bone = this.bone.bone;
 		skeleton.sortBone(bone);
-		skeleton.resetCache(bone);
 		skeleton.updateCache.add(this);
 		skeleton.sortReset(bone.children);
+		skeleton.constrained(bone);
 	}
 
 	boolean isSourceActive () {
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Skeleton.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Skeleton.java
index 9581b58d2..55ae06676 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Skeleton.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Skeleton.java
@@ -202,7 +202,7 @@ public class Skeleton {
 			if (updateCache[i] instanceof Bone bone) updateCache[i] = bone.applied;
 	}
 
-	void resetCache (Posed object) {
+	void constrained (Posed object) {
 		if (object.pose == object.applied) {
 			object.applied = object.constrained;
 			resetCache.add(object);
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Slider.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Slider.java
index 9e6d1de7a..f02fd8924 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Slider.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Slider.java
@@ -70,22 +70,10 @@ public class Slider extends Constraint<Slider, SliderData, SliderPose> {
 				pose.time = Math.max(0, pose.time);
 		}
 
-		SliderData data = this.data;
-		Timeline[] timelines = animation.timelines.items;
-		int timelineCount = animation.timelines.size;
 		Bone[] bones = skeleton.bones.items;
-		if (pose.mix == 1) {
-			for (int i = 0; i < timelineCount; i++)
-				if (timelines[i] instanceof BoneTimeline timeline) bones[timeline.getBoneIndex()].resetUpdate(skeleton);
-		} else {
-			for (int i = 0; i < timelineCount; i++) {
-				if (timelines[i] instanceof BoneTimeline timeline) {
-					Bone bone = bones[timeline.getBoneIndex()];
-					bone.resetUpdate(skeleton);
-					if (bone.applied.local == skeleton.update) bone.applied.updateLocalTransform(skeleton);
-				}
-			}
-		}
+		Timeline[] timelines = animation.timelines.items;
+		for (int i = 0, n = animation.timelines.size; i < n; i++)
+			if (timelines[i] instanceof BoneTimeline timeline) bones[timeline.getBoneIndex()].applied.modifyLocal(skeleton);
 
 		SliderPose pose = applied;
 		animation.apply(skeleton, pose.time, pose.time, data.loop, null, pose.mix, data.additive ? MixBlend.add : MixBlend.replace,
@@ -93,35 +81,32 @@ public class Slider extends Constraint<Slider, SliderData, SliderPose> {
 	}
 
 	void sort (Skeleton skeleton) {
-		Timeline[] timelines = data.animation.timelines.items;
-		int timelineCount = data.animation.timelines.size;
-		Bone[] bones = skeleton.bones.items;
-		for (int i = 0; i < timelineCount; i++)
-			if (timelines[i] instanceof BoneTimeline timeline) skeleton.sortBone(bones[timeline.getBoneIndex()]);
-
+		if (bone != null && !data.local) skeleton.sortBone(bone);
 		skeleton.updateCache.add(this);
 
+		Timeline[] timelines = data.animation.timelines.items;
+		Bone[] bones = skeleton.bones.items;
 		Slot[] slots = skeleton.slots.items;
 		Constraint[] constraints = skeleton.constraints.items;
 		PhysicsConstraint[] physics = skeleton.physics.items;
 		int physicsCount = skeleton.physics.size;
-		for (int i = 0; i < timelineCount; i++) {
+		for (int i = 0, n = data.animation.timelines.size; i < n; i++) {
 			Timeline t = timelines[i];
 			if (t instanceof BoneTimeline timeline) {
 				Bone bone = bones[timeline.getBoneIndex()];
-				skeleton.resetCache(bone);
-				skeleton.sortReset(bone.children);
 				bone.sorted = false;
+				skeleton.sortReset(bone.children);
+				skeleton.constrained(bone);
 			} else if (t instanceof SlotTimeline timeline)
-				skeleton.resetCache(slots[timeline.getSlotIndex()]);
+				skeleton.constrained(slots[timeline.getSlotIndex()]);
 			else if (t instanceof PhysicsConstraintTimeline timeline) {
 				if (timeline.constraintIndex == -1) {
 					for (int ii = 0; ii < physicsCount; ii++)
-						skeleton.resetCache(physics[ii]);
+						skeleton.constrained(physics[ii]);
 				} else
-					skeleton.resetCache(constraints[timeline.constraintIndex]);
+					skeleton.constrained(constraints[timeline.constraintIndex]);
 			} else if (t instanceof ConstraintTimeline timeline) //
-				skeleton.resetCache(constraints[timeline.getConstraintIndex()]);
+				skeleton.constrained(constraints[timeline.getConstraintIndex()]);
 		}
 	}
 
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/TransformConstraint.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/TransformConstraint.java
index c7428e009..24b22aac7 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/TransformConstraint.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/TransformConstraint.java
@@ -72,13 +72,16 @@ public class TransformConstraint extends Constraint<TransformConstraint, Transfo
 		float[] offsets = data.offsets;
 		BonePose source = this.source.applied;
 		int update = skeleton.update;
-		if (localSource && source.local == skeleton.update) source.updateLocalTransform(skeleton);
+		if (localSource) source.modifyLocal(skeleton);
 		FromProperty[] fromItems = data.properties.items;
 		int fn = data.properties.size;
 		BonePose[] bones = this.bones.items;
 		for (int i = 0, n = this.bones.size; i < n; i++) {
 			BonePose bone = bones[i];
-			if (localTarget && bone.local == update) bone.updateLocalTransform(skeleton);
+			if (localTarget)
+				bone.modifyLocal(skeleton);
+			else
+				bone.modifyWorld(update);
 			for (int f = 0; f < fn; f++) {
 				FromProperty from = fromItems[f];
 				float value = from.value(source, localSource, offsets) - from.offset;
@@ -97,28 +100,26 @@ public class TransformConstraint extends Constraint<TransformConstraint, Transfo
 					}
 				}
 			}
-			if (localTarget)
-				bone.updateWorldTransform(skeleton);
-			else
-				bone.local = update;
-			bone.bone.resetUpdate(skeleton);
 		}
 	}
 
 	void sort (Skeleton skeleton) {
-		skeleton.sortBone(source);
+		if (!data.localSource) skeleton.sortBone(source);
 		BonePose[] bones = this.bones.items;
 		int boneCount = this.bones.size;
-		for (int i = 0; i < boneCount; i++) {
-			Bone bone = bones[i].bone;
-			skeleton.resetCache(bone);
-			skeleton.sortBone(bone);
+		boolean worldTarget = !data.localTarget;
+		if (worldTarget) {
+			for (int i = 0; i < boneCount; i++)
+				skeleton.sortBone(bones[i].bone);
 		}
 		skeleton.updateCache.add(this);
+		for (int i = 0; i < boneCount; i++) {
+			Bone bone = bones[i].bone;
+			skeleton.sortReset(bone.children);
+			skeleton.constrained(bone);
+		}
 		for (int i = 0; i < boneCount; i++)
-			skeleton.sortReset(bones[i].bone.children);
-		for (int i = 0; i < boneCount; i++)
-			bones[i].bone.sorted = true;
+			bones[i].bone.sorted = worldTarget;
 	}
 
 	boolean isSourceActive () {