diff --git a/spine-lua/Animation.lua b/spine-lua/Animation.lua
index 9f33f3144..205427150 100644
--- a/spine-lua/Animation.lua
+++ b/spine-lua/Animation.lua
@@ -413,9 +413,16 @@ function Animation.AttachmentTimeline.new ()
 		end
 
 		local attachmentName = self.attachmentNames[frameIndex]
-		local attachment
-		if attachmentName then attachment = skeleton:getAttachment(self.slotName, attachmentName) end
-		skeleton:findSlot(self.slotName):setAttachment(attachment)
+    local slot = skeleton.slotsByName[self.slotName]
+    if attachmentName then
+      if not slot.attachment then
+        slot:setAttachment(skeleton:getAttachment(self.slotName, attachmentName))
+      elseif slot.attachment.name ~= attachmentName then
+        slot:setAttachment(skeleton:getAttachment(self.slotName, attachmentName))
+      end
+    else
+      slot:setAttachment(nil)
+    end
 	end
 
 	return self
diff --git a/spine-lua/Skeleton.lua b/spine-lua/Skeleton.lua
index 2626de810..b19ad86c9 100644
--- a/spine-lua/Skeleton.lua
+++ b/spine-lua/Skeleton.lua
@@ -35,6 +35,7 @@ function Skeleton.new (skeletonData)
 		data = skeletonData,
 		bones = {},
 		slots = {},
+    slotsByName = {},
 		drawOrder = {}
 	}
 
@@ -73,13 +74,10 @@ function Skeleton.new (skeletonData)
 		return nil
 	end
 
-	function self:findSlot (slotName)
-		if not slotName then error("slotName cannot be nil.", 2) end
-		for i,slot in ipairs(self.slots) do
-			if slot.data.name == slotName then return slot end
-		end
-		return nil
-	end
+  function self:findSlot (slotName)
+    if not slotName then error("slotName cannot be nil.", 2) end
+    return slotsByName[slotName]
+  end
 
 	function self:setSkin (skinName)
 		local newSkin
@@ -106,7 +104,7 @@ function Skeleton.new (skeletonData)
 	function self:getAttachment (slotName, attachmentName)
 		if not slotName then error("slotName cannot be nil.", 2) end
 		if not attachmentName then error("attachmentName cannot be nil.", 2) end
-		local slotIndex = self.data:findSlotIndex(slotName)
+		local slotIndex = skeletonData.slotNameIndices[slotName]
 		if slotIndex == -1 then error("Slot not found: " .. slotName, 2) end
 		if self.skin then
 			local attachment = self.skin:getAttachment(slotIndex, attachmentName)
@@ -147,6 +145,7 @@ function Skeleton.new (skeletonData)
 		local bone = self.bones[spine.utils.indexOf(skeletonData.bones, slotData.boneData)]
 		local slot = Slot.new(slotData, self, bone)
 		table.insert(self.slots, slot)
+        self.slotsByName[slot.data.name] = slot
 		table.insert(self.drawOrder, slot)
 	end
 
diff --git a/spine-lua/SkeletonData.lua b/spine-lua/SkeletonData.lua
index db776b153..531f9613e 100644
--- a/spine-lua/SkeletonData.lua
+++ b/spine-lua/SkeletonData.lua
@@ -28,6 +28,7 @@ function SkeletonData.new ()
 	local self = {
 		bones = {},
 		slots = {},
+    slotNameIndices = {},
 		skins = {},
 		animations = {}
 	}
@@ -58,10 +59,7 @@ function SkeletonData.new ()
 
 	function self:findSlotIndex (slotName)
 		if not slotName then error("slotName cannot be nil.", 2) end
-		for i,slot in ipairs(self.slots) do
-			if slot.name == slotName then return i end
-		end
-		return -1
+		return slotNameIndices[slotName] or -1
 	end
 
 	function self:findSkin (skinName)
diff --git a/spine-lua/SkeletonJson.lua b/spine-lua/SkeletonJson.lua
index a837ceb13..0125d5833 100644
--- a/spine-lua/SkeletonJson.lua
+++ b/spine-lua/SkeletonJson.lua
@@ -29,7 +29,6 @@ local SlotData = require "spine-lua.SlotData"
 local Skin = require "spine-lua.Skin"
 local AttachmentLoader = require "spine-lua.AttachmentLoader"
 local Animation = require "spine-lua.Animation"
-
 local TIMELINE_SCALE = "scale"
 local TIMELINE_ROTATE = "rotate"
 local TIMELINE_TRANSLATE = "translate"
@@ -102,8 +101,9 @@ function SkeletonJson.new (attachmentLoader)
 				end
 
 				slotData.attachmentName = slotMap["attachment"]
-
-				table.insert(skeletonData.slots, slotData)
+        table.insert(skeletonData.slots, slotData)
+        skeletonData.slotNameIndices[slotData.name] = #skeletonData.slots
+        
 			end
 		end
 
@@ -113,7 +113,7 @@ function SkeletonJson.new (attachmentLoader)
 			for skinName,skinMap in pairs(map) do
 				local skin = Skin.new(skinName)
 				for slotName,slotMap in pairs(skinMap) do
-					local slotIndex = skeletonData:findSlotIndex(slotName)
+					local slotIndex = skeletonData.slotNameIndices[slotName]
 					for attachmentName,attachmentMap in pairs(slotMap) do
 						local attachment = readAttachment(attachmentName, attachmentMap, self.scale)
 						if attachment then
@@ -213,7 +213,7 @@ function SkeletonJson.new (attachmentLoader)
 		local slotsMap = map["slots"]
 		if slotsMap then
 			for slotName,timelineMap in pairs(slotsMap) do
-				local slotIndex = skeletonData:findSlotIndex(slotName)
+				local slotIndex = skeletonData.slotNameIndices[slotName]
 
 				for timelineName,values in pairs(timelineMap) do
 					if timelineName == TIMELINE_COLOR then
diff --git a/spine-unity/Assets/Plugins/Spine/SkeletonComponent.cs b/spine-unity/Assets/Plugins/Spine/SkeletonComponent.cs
index 143d0541d..46d904a33 100644
--- a/spine-unity/Assets/Plugins/Spine/SkeletonComponent.cs
+++ b/spine-unity/Assets/Plugins/Spine/SkeletonComponent.cs
@@ -36,8 +36,9 @@ public class SkeletonComponent : MonoBehaviour {
 	public String initialSkinName;
 	public float timeScale = 1;
 	private Mesh mesh;
+	private int lastVertexCount;
 	private Vector3[] vertices;
-	private Color[] colors;
+	private Color32[] colors;
 	private Vector2[] uvs;
 	private int[] triangles;
 	private float[] vertexPositions = new float[8];
@@ -99,11 +100,13 @@ public class SkeletonComponent : MonoBehaviour {
 
 		// Ensure mesh data is the right size.
 		Vector3[] vertices = this.vertices;
-		bool newTriangles = quadCount > vertices.Length / 4;
+		int vertexCount = quadCount * 4;
+		bool newTriangles = vertexCount > vertices.Length;
 		if (newTriangles) {
-			this.vertices = vertices = new Vector3[quadCount * 4];
-			colors = new Color[quadCount * 4];
-			uvs = new Vector2[quadCount * 4];
+			// Not enough vertices, increase size.
+			this.vertices = vertices = new Vector3[vertexCount];
+			colors = new Color32[vertexCount];
+			uvs = new Vector2[vertexCount];
 			triangles = new int[quadCount * 6];
 			mesh.Clear();
 			
@@ -118,15 +121,17 @@ public class SkeletonComponent : MonoBehaviour {
 				triangles[index + 5] = vertex + 1;
 			}
 		} else {
+			// Too many vertices, zero the extra.
 			Vector3 zero = new Vector3(0, 0, 0);
-			for (int i = quadCount * 4, n = vertices.Length; i < n; i++)
+			for (int i = vertexCount, n = lastVertexCount; i < n; i++)
 				vertices[i] = zero;
 		}
+		lastVertexCount = vertexCount;
 
 		// Setup mesh.
 		float[] vertexPositions = this.vertexPositions;
 		int vertexIndex = 0;
-		Color color = new Color();
+		Color32 color = new Color32();
 		for (int i = 0, n = drawOrder.Count; i < n; i++) {
 			Slot slot = drawOrder[i];
 			RegionAttachment regionAttachment = slot.Attachment as RegionAttachment;
@@ -139,10 +144,10 @@ public class SkeletonComponent : MonoBehaviour {
 			vertices[vertexIndex + 2] = new Vector3(vertexPositions[RegionAttachment.X2], vertexPositions[RegionAttachment.Y2], 0);
 			vertices[vertexIndex + 3] = new Vector3(vertexPositions[RegionAttachment.X3], vertexPositions[RegionAttachment.Y3], 0);
 			
-			color.a = skeleton.A * slot.A;
-			color.r = skeleton.R * slot.R * color.a;
-			color.g = skeleton.G * slot.G * color.a;
-			color.b = skeleton.B * slot.B * color.a;
+			color.a = (byte)(skeleton.A * slot.A * 255);
+			color.r = (byte)(skeleton.R * slot.R * color.a);
+			color.g = (byte)(skeleton.G * slot.G * color.a);
+			color.b = (byte)(skeleton.B * slot.B * color.a);
 			colors[vertexIndex] = color;
 			colors[vertexIndex + 1] = color;
 			colors[vertexIndex + 2] = color;
@@ -157,7 +162,7 @@ public class SkeletonComponent : MonoBehaviour {
 			vertexIndex += 4;
 		}
 		mesh.vertices = vertices;
-		mesh.colors = colors;
+		mesh.colors32 = colors;
 		mesh.uv = uvs;
 		if (newTriangles) mesh.triangles = triangles;
 	}