diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonBinary.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonBinary.java
index eb619c648..cd13d1300 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonBinary.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonBinary.java
@@ -303,42 +303,40 @@ public class SkeletonBinary extends SkeletonLoader {
 					FromProperty[] froms = data.properties.setSize(nn = flags >> 5);
 					for (int ii = 0, tn; ii < nn; ii++) {
 						float fromScale = 1;
-						FromProperty from;
-						switch (input.readByte()) {
-						case 0 -> from = new FromRotate();
+						FromProperty from = switch (input.readByte()) {
+						case 0 -> new FromRotate();
 						case 1 -> {
-							from = new FromX();
 							fromScale = scale;
+							yield new FromX();
 						}
 						case 2 -> {
-							from = new FromY();
 							fromScale = scale;
+							yield new FromY();
 						}
-						case 3 -> from = new FromScaleX();
-						case 4 -> from = new FromScaleY();
-						case 5 -> from = new FromShearY();
-						default -> from = null;
-						}
+						case 3 -> new FromScaleX();
+						case 4 -> new FromScaleY();
+						case 5 -> new FromShearY();
+						default -> null;
+						};
 						from.offset = input.readFloat() * fromScale;
 						ToProperty[] tos = from.to.setSize(tn = input.readByte());
 						for (int t = 0; t < tn; t++) {
 							float toScale = 1;
-							ToProperty to;
-							switch (input.readByte()) {
-							case 0 -> to = new ToRotate();
+							ToProperty to = switch (input.readByte()) {
+							case 0 -> new ToRotate();
 							case 1 -> {
-								to = new ToX();
 								toScale = scale;
+								yield new ToX();
 							}
 							case 2 -> {
-								to = new ToY();
 								toScale = scale;
+								yield new ToY();
 							}
-							case 3 -> to = new ToScaleX();
-							case 4 -> to = new ToScaleY();
-							case 5 -> to = new ToShearY();
-							default -> to = null;
-							}
+							case 3 -> new ToScaleX();
+							case 4 -> new ToScaleY();
+							case 5 -> new ToShearY();
+							default -> null;
+							};
 							to.offset = input.readFloat() * toScale;
 							to.max = input.readFloat() * toScale;
 							to.scale = input.readFloat() * toScale / fromScale;
@@ -347,12 +345,12 @@ public class SkeletonBinary extends SkeletonLoader {
 						froms[ii] = from;
 					}
 					flags = input.read();
-					if ((flags & 1) != 0) data.offsetRotation = input.readFloat();
-					if ((flags & 2) != 0) data.offsetX = input.readFloat() * scale;
-					if ((flags & 4) != 0) data.offsetY = input.readFloat() * scale;
-					if ((flags & 8) != 0) data.offsetScaleX = input.readFloat();
-					if ((flags & 16) != 0) data.offsetScaleY = input.readFloat();
-					if ((flags & 32) != 0) data.offsetShearY = input.readFloat();
+					if ((flags & 1) != 0) data.offsets[0] = input.readFloat();
+					if ((flags & 2) != 0) data.offsets[1] = input.readFloat() * scale;
+					if ((flags & 4) != 0) data.offsets[2] = input.readFloat() * scale;
+					if ((flags & 8) != 0) data.offsets[3] = input.readFloat();
+					if ((flags & 16) != 0) data.offsets[4] = input.readFloat();
+					if ((flags & 32) != 0) data.offsets[5] = input.readFloat();
 					flags = input.read();
 					TransformConstraintPose setup = data.setup;
 					if ((flags & 1) != 0) setup.mixRotate = input.readFloat();
@@ -422,6 +420,28 @@ public class SkeletonBinary extends SkeletonLoader {
 					data.additive = (nn & 4) != 0;
 					if ((nn & 8) != 0) data.setup.time = input.readFloat();
 					if ((nn & 16) != 0) data.setup.mix = (nn & 32) != 0 ? input.readFloat() : 1;
+					if ((nn & 64) != 0) {
+						data.local = (nn & 128) != 0;
+						data.bone = bones[input.readInt(true)];
+						float offset = input.readFloat();
+						data.property = switch (input.readByte()) {
+						case 0 -> new FromRotate();
+						case 1 -> {
+							offset *= scale;
+							yield new FromX();
+						}
+						case 2 -> {
+							offset *= scale;
+							yield new FromY();
+						}
+						case 3 -> new FromScaleX();
+						case 4 -> new FromScaleY();
+						case 5 -> new FromShearY();
+						default -> null;
+						};
+						data.property.offset = offset;
+						data.scale = input.readFloat();
+					}
 					constraints[i] = data;
 				}
 				}
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonJson.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonJson.java
index 150434e73..acdb91ed5 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonJson.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonJson.java
@@ -268,23 +268,8 @@ public class SkeletonJson extends SkeletonLoader {
 
 				boolean rotate = false, x = false, y = false, scaleX = false, scaleY = false, shearY = false;
 				for (JsonValue fromEntry = constraintMap.getChild("properties"); fromEntry != null; fromEntry = fromEntry.next) {
-					float fromScale = 1;
-					FromProperty from;
-					switch (fromEntry.name) {
-					case "rotate" -> from = new FromRotate();
-					case "x" -> {
-						from = new FromX();
-						fromScale = scale;
-					}
-					case "y" -> {
-						from = new FromY();
-						fromScale = scale;
-					}
-					case "scaleX" -> from = new FromScaleX();
-					case "scaleY" -> from = new FromScaleY();
-					case "shearY" -> from = new FromShearY();
-					default -> throw new SerializationException("Invalid transform constraint from property: " + fromEntry.name);
-					}
+					FromProperty from = fromProperty(fromEntry.name);
+					float fromScale = propertyScale(fromEntry.name, scale);
 					from.offset = fromEntry.getFloat("offset", 0) * fromScale;
 					for (JsonValue toEntry = fromEntry.getChild("to"); toEntry != null; toEntry = toEntry.next) {
 						float toScale = 1;
@@ -326,12 +311,12 @@ public class SkeletonJson extends SkeletonLoader {
 					if (from.to.notEmpty()) data.properties.add(from);
 				}
 
-				data.offsetRotation = constraintMap.getFloat("rotation", 0);
-				data.offsetX = constraintMap.getFloat("x", 0) * scale;
-				data.offsetY = constraintMap.getFloat("y", 0) * scale;
-				data.offsetScaleX = constraintMap.getFloat("scaleX", 0);
-				data.offsetScaleY = constraintMap.getFloat("scaleY", 0);
-				data.offsetShearY = constraintMap.getFloat("shearY", 0);
+				data.offsets[0] = constraintMap.getFloat("rotation", 0);
+				data.offsets[1] = constraintMap.getFloat("x", 0) * scale;
+				data.offsets[2] = constraintMap.getFloat("y", 0) * scale;
+				data.offsets[3] = constraintMap.getFloat("scaleX", 0);
+				data.offsets[4] = constraintMap.getFloat("scaleY", 0);
+				data.offsets[5] = constraintMap.getFloat("shearY", 0);
 
 				TransformConstraintPose setup = data.setup;
 				if (rotate) setup.mixRotate = constraintMap.getFloat("mixRotate", 1);
@@ -408,10 +393,22 @@ public class SkeletonJson extends SkeletonLoader {
 			case "slider" -> {
 				var data = new SliderData(name);
 				data.skinRequired = skinRequired;
-				data.loop = constraintMap.getBoolean("loop", false);
 				data.additive = constraintMap.getBoolean("additive", false);
+				data.loop = constraintMap.getBoolean("loop", false);
 				data.setup.time = constraintMap.getFloat("time", 0);
 				data.setup.mix = constraintMap.getFloat("mix", 1);
+
+				String boneName = constraintMap.getString("bone", null);
+				if (boneName != null) {
+					data.bone = skeletonData.findBone(boneName);
+					if (data.bone == null) throw new SerializationException("Slider bone not found: " + boneName);
+					String property = constraintMap.getString("property");
+					data.property = fromProperty(property);
+					data.property.offset = constraintMap.getFloat("offset", 0) * propertyScale(property, scale);
+					data.scale = constraintMap.getFloat("scale");
+					data.local = constraintMap.getBoolean("local", false);
+				}
+
 				skeletonData.constraints.add(data);
 			}
 			}
@@ -523,6 +520,25 @@ public class SkeletonJson extends SkeletonLoader {
 		return skeletonData;
 	}
 
+	private FromProperty fromProperty (String type) {
+		return switch (type) {
+		case "rotate" -> new FromRotate();
+		case "x" -> new FromX();
+		case "y" -> new FromY();
+		case "scaleX" -> new FromScaleX();
+		case "scaleY" -> new FromScaleY();
+		case "shearY" -> new FromShearY();
+		default -> throw new SerializationException("Invalid from property: " + type);
+		};
+	}
+
+	private float propertyScale (String type, float scale) {
+		return switch (type) {
+		case "x", "y" -> scale;
+		default -> 1;
+		};
+	}
+
 	private Attachment readAttachment (JsonValue map, Skin skin, int slotIndex, String name, SkeletonData skeletonData) {
 		float scale = this.scale;
 		name = map.getString("name", name);
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 aaa51b5f8..9e6d1de7a 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Slider.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Slider.java
@@ -41,12 +41,19 @@ import com.esotericsoftware.spine.Animation.Timeline;
  * <p>
  * See <a href="https://esotericsoftware.com/spine-physics-constraints">Physics constraints</a> in the Spine User Guide. */
 public class Slider extends Constraint<Slider, SliderData, SliderPose> {
-	public Slider (SliderData data) {
+	static private final float[] offsets = new float[6];
+
+	Bone bone;
+
+	public Slider (SliderData data, Skeleton skeleton) {
 		super(data, new SliderPose(), new SliderPose());
+		if (skeleton == null) throw new IllegalArgumentException("skeleton cannot be null.");
+
+		if (data.bone != null) bone = skeleton.bones.items[data.bone.index];
 	}
 
 	public Slider copy (Skeleton skeleton) {
-		var copy = new Slider(data);
+		var copy = new Slider(data, skeleton);
 		copy.pose.set(pose);
 		return copy;
 	}
@@ -54,9 +61,18 @@ public class Slider extends Constraint<Slider, SliderData, SliderPose> {
 	public void update (Skeleton skeleton, Physics physics) {
 		if (pose.mix == 0) return;
 
+		Animation animation = data.animation;
+		if (bone != null && bone.active) {
+			pose.time = (data.property.value(bone.applied, data.local, offsets) - data.property.offset) * data.scale;
+			if (data.loop)
+				pose.time = animation.duration + (pose.time % animation.duration);
+			else
+				pose.time = Math.max(0, pose.time);
+		}
+
 		SliderData data = this.data;
-		Timeline[] timelines = data.animation.timelines.items;
-		int timelineCount = data.animation.timelines.size;
+		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++)
@@ -72,8 +88,8 @@ public class Slider extends Constraint<Slider, SliderData, SliderPose> {
 		}
 
 		SliderPose pose = applied;
-		data.animation.apply(skeleton, pose.time, pose.time, data.loop, null, pose.mix,
-			data.additive ? MixBlend.add : MixBlend.replace, MixDirection.in, true);
+		animation.apply(skeleton, pose.time, pose.time, data.loop, null, pose.mix, data.additive ? MixBlend.add : MixBlend.replace,
+			MixDirection.in, true);
 	}
 
 	void sort (Skeleton skeleton) {
@@ -108,4 +124,12 @@ public class Slider extends Constraint<Slider, SliderData, SliderPose> {
 				skeleton.resetCache(constraints[timeline.getConstraintIndex()]);
 		}
 	}
+
+	public Bone getBone () {
+		return bone;
+	}
+
+	public void setBone (Bone bone) {
+		this.bone = bone;
+	}
 }
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SliderData.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SliderData.java
index d62815774..c3506c91e 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SliderData.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SliderData.java
@@ -29,19 +29,27 @@
 
 package com.esotericsoftware.spine;
 
+import com.badlogic.gdx.utils.Null;
+
+import com.esotericsoftware.spine.TransformConstraintData.FromProperty;
+
 /** Stores the setup pose for a {@link PhysicsConstraint}.
  * <p>
  * See <a href="https://esotericsoftware.com/spine-physics-constraints">Physics constraints</a> in the Spine User Guide. */
 public class SliderData extends ConstraintData<Slider, SliderPose> {
 	Animation animation;
 	boolean additive, loop;
+	@Null BoneData bone;
+	@Null FromProperty property;
+	float scale;
+	boolean local;
 
 	public SliderData (String name) {
 		super(name, new SliderPose());
 	}
 
 	public Slider create (Skeleton skeleton) {
-		return new Slider(this);
+		return new Slider(this, skeleton);
 	}
 
 	public Animation getAnimation () {
@@ -67,4 +75,36 @@ public class SliderData extends ConstraintData<Slider, SliderPose> {
 	public void setLoop (boolean loop) {
 		this.loop = loop;
 	}
+
+	public @Null BoneData getBone () {
+		return bone;
+	}
+
+	public void setBone (@Null BoneData bone) {
+		this.bone = bone;
+	}
+
+	public @Null FromProperty getProperty () {
+		return property;
+	}
+
+	public void setProperty (@Null FromProperty property) {
+		this.property = property;
+	}
+
+	public float getScale () {
+		return scale;
+	}
+
+	public void setScale (float scale) {
+		this.scale = scale;
+	}
+
+	public boolean getLocal () {
+		return local;
+	}
+
+	public void setLocal (boolean local) {
+		this.local = local;
+	}
 }
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 aa6ce3b17..c7428e009 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/TransformConstraint.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/TransformConstraint.java
@@ -69,6 +69,7 @@ public class TransformConstraint extends Constraint<TransformConstraint, Transfo
 
 		TransformConstraintData data = this.data;
 		boolean localSource = data.localSource, localTarget = data.localTarget, additive = data.additive, clamp = data.clamp;
+		float[] offsets = data.offsets;
 		BonePose source = this.source.applied;
 		int update = skeleton.update;
 		if (localSource && source.local == skeleton.update) source.updateLocalTransform(skeleton);
@@ -80,7 +81,7 @@ public class TransformConstraint extends Constraint<TransformConstraint, Transfo
 			if (localTarget && bone.local == update) bone.updateLocalTransform(skeleton);
 			for (int f = 0; f < fn; f++) {
 				FromProperty from = fromItems[f];
-				float value = from.value(data, source, localSource) - from.offset;
+				float value = from.value(source, localSource, offsets) - from.offset;
 				ToProperty[] toItems = from.to.items;
 				for (int t = 0, tn = from.to.size; t < tn; t++) {
 					ToProperty to = toItems[t];
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/TransformConstraintData.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/TransformConstraintData.java
index 3ef741eb8..f4964999c 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/TransformConstraintData.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/TransformConstraintData.java
@@ -39,7 +39,7 @@ import com.badlogic.gdx.utils.Array;
 public class TransformConstraintData extends ConstraintData<TransformConstraint, TransformConstraintPose> {
 	final Array<BoneData> bones = new Array(true, 0, BoneData[]::new);
 	BoneData source;
-	float offsetRotation, offsetX, offsetY, offsetScaleX, offsetScaleY, offsetShearY;
+	float[] offsets = new float[6];
 	boolean localSource, localTarget, additive, clamp;
 	final Array<FromProperty> properties = new Array(true, 1, FromProperty[]::new);
 
@@ -68,56 +68,56 @@ public class TransformConstraintData extends ConstraintData<TransformConstraint,
 
 	/** An offset added to the constrained bone rotation. */
 	public float getOffsetRotation () {
-		return offsetRotation;
+		return offsets[0];
 	}
 
 	public void setOffsetRotation (float offsetRotation) {
-		this.offsetRotation = offsetRotation;
+		offsets[0] = offsetRotation;
 	}
 
 	/** An offset added to the constrained bone X translation. */
 	public float getOffsetX () {
-		return offsetX;
+		return offsets[1];
 	}
 
 	public void setOffsetX (float offsetX) {
-		this.offsetX = offsetX;
+		offsets[1] = offsetX;
 	}
 
 	/** An offset added to the constrained bone Y translation. */
 	public float getOffsetY () {
-		return offsetY;
+		return offsets[2];
 	}
 
 	public void setOffsetY (float offsetY) {
-		this.offsetY = offsetY;
+		offsets[2] = offsetY;
 	}
 
 	/** An offset added to the constrained bone scaleX. */
 	public float getOffsetScaleX () {
-		return offsetScaleX;
+		return offsets[3];
 	}
 
 	public void setOffsetScaleX (float offsetScaleX) {
-		this.offsetScaleX = offsetScaleX;
+		offsets[3] = offsetScaleX;
 	}
 
 	/** An offset added to the constrained bone scaleY. */
 	public float getOffsetScaleY () {
-		return offsetScaleY;
+		return offsets[4];
 	}
 
 	public void setOffsetScaleY (float offsetScaleY) {
-		this.offsetScaleY = offsetScaleY;
+		offsets[4] = offsetScaleY;
 	}
 
 	/** An offset added to the constrained bone shearY. */
 	public float getOffsetShearY () {
-		return offsetShearY;
+		return offsets[5];
 	}
 
 	public void setOffsetShearY (float offsetShearY) {
-		this.offsetShearY = offsetShearY;
+		offsets[5] = offsetShearY;
 	}
 
 	/** Reads the source bone's local transform instead of its world transform. */
@@ -170,7 +170,7 @@ public class TransformConstraintData extends ConstraintData<TransformConstraint,
 		public final Array<ToProperty> to = new Array(true, 1, ToProperty[]::new);
 
 		/** Reads this property from the specified bone. */
-		abstract public float value (TransformConstraintData data, BonePose source, boolean local);
+		abstract public float value (BonePose source, boolean local, float[] offsets);
 	}
 
 	/** Constrained property for a {@link TransformConstraint}. */
@@ -192,10 +192,10 @@ public class TransformConstraintData extends ConstraintData<TransformConstraint,
 	}
 
 	static public class FromRotate extends FromProperty {
-		public float value (TransformConstraintData data, BonePose source, boolean local) {
-			if (local) return source.rotation + data.offsetRotation;
+		public float value (BonePose source, boolean local, float[] offsets) {
+			if (local) return source.rotation + offsets[0];
 			float value = atan2(source.c, source.a) * radDeg
-				+ (source.a * source.d - source.b * source.c > 0 ? data.offsetRotation : -data.offsetRotation);
+				+ (source.a * source.d - source.b * source.c > 0 ? offsets[0] : -offsets[0]);
 			if (value < 0) value += 360;
 			return value;
 		}
@@ -229,8 +229,8 @@ public class TransformConstraintData extends ConstraintData<TransformConstraint,
 	}
 
 	static public class FromX extends FromProperty {
-		public float value (TransformConstraintData data, BonePose source, boolean local) {
-			return local ? source.x + data.offsetX : data.offsetX * source.a + data.offsetY * source.b + source.worldX;
+		public float value (BonePose source, boolean local, float[] offsets) {
+			return local ? source.x + offsets[1] : offsets[1] * source.a + offsets[2] * source.b + source.worldX;
 		}
 	}
 
@@ -251,8 +251,8 @@ public class TransformConstraintData extends ConstraintData<TransformConstraint,
 	}
 
 	static public class FromY extends FromProperty {
-		public float value (TransformConstraintData data, BonePose source, boolean local) {
-			return local ? source.y + data.offsetY : data.offsetX * source.c + data.offsetY * source.d + source.worldY;
+		public float value (BonePose source, boolean local, float[] offsets) {
+			return local ? source.y + offsets[2] : offsets[1] * source.c + offsets[2] * source.d + source.worldY;
 		}
 	}
 
@@ -273,8 +273,8 @@ public class TransformConstraintData extends ConstraintData<TransformConstraint,
 	}
 
 	static public class FromScaleX extends FromProperty {
-		public float value (TransformConstraintData data, BonePose source, boolean local) {
-			return (local ? source.scaleX : (float)Math.sqrt(source.a * source.a + source.c * source.c)) + data.offsetScaleX;
+		public float value (BonePose source, boolean local, float[] offsets) {
+			return (local ? source.scaleX : (float)Math.sqrt(source.a * source.a + source.c * source.c)) + offsets[3];
 		}
 	}
 
@@ -304,8 +304,8 @@ public class TransformConstraintData extends ConstraintData<TransformConstraint,
 	}
 
 	static public class FromScaleY extends FromProperty {
-		public float value (TransformConstraintData data, BonePose source, boolean local) {
-			return (local ? source.scaleY : (float)Math.sqrt(source.b * source.b + source.d * source.d)) + data.offsetScaleY;
+		public float value (BonePose source, boolean local, float[] offsets) {
+			return (local ? source.scaleY : (float)Math.sqrt(source.b * source.b + source.d * source.d)) + offsets[4];
 		}
 	}
 
@@ -335,9 +335,8 @@ public class TransformConstraintData extends ConstraintData<TransformConstraint,
 	}
 
 	static public class FromShearY extends FromProperty {
-		public float value (TransformConstraintData data, BonePose source, boolean local) {
-			return (local ? source.shearY : (atan2(source.d, source.b) - atan2(source.c, source.a)) * radDeg - 90)
-				+ data.offsetShearY;
+		public float value (BonePose source, boolean local, float[] offsets) {
+			return (local ? source.shearY : (atan2(source.d, source.b) - atan2(source.c, source.a)) * radDeg - 90) + offsets[5];
 		}
 	}