diff --git a/kool-core/src/commonMain/kotlin/de/fabmax/kool/scene/Model.kt b/kool-core/src/commonMain/kotlin/de/fabmax/kool/scene/Model.kt
index 9b997a25d..c4e2b8aa8 100644
--- a/kool-core/src/commonMain/kotlin/de/fabmax/kool/scene/Model.kt
+++ b/kool-core/src/commonMain/kotlin/de/fabmax/kool/scene/Model.kt
@@ -30,7 +30,9 @@ class Model(name: String? = null) : Node(name) {
     }
 
     fun applyAnimation(deltaT: Float) {
-        animations.forEach(Animation::reset)
+        for (i in animations.indices) {
+            animations[i].reset()
+        }
 
         var firstActive = true
         for (i in animations.indices) {
diff --git a/kool-core/src/commonMain/kotlin/de/fabmax/kool/scene/animation/Animation.kt b/kool-core/src/commonMain/kotlin/de/fabmax/kool/scene/animation/Animation.kt
index 6966a6d17..ec7c3065c 100644
--- a/kool-core/src/commonMain/kotlin/de/fabmax/kool/scene/animation/Animation.kt
+++ b/kool-core/src/commonMain/kotlin/de/fabmax/kool/scene/animation/Animation.kt
@@ -1,7 +1,6 @@
 package de.fabmax.kool.scene.animation
 
 import de.fabmax.kool.math.*
-import de.fabmax.kool.scene.MatrixTransformF
 import de.fabmax.kool.scene.Mesh
 import de.fabmax.kool.scene.Node
 import de.fabmax.kool.scene.TrsTransformF
@@ -22,7 +21,7 @@ class Animation(val name: String?) {
     private val animationNodes = mutableListOf<AnimationNode>()
 
     fun prepareAnimation() {
-        duration = channels.map { it.lastKeyTime }.maxOrNull() ?: 0f
+        duration = channels.maxOfOrNull { it.lastKeyTime } ?: 0f
         channels.forEach { it.duration = duration }
         animationNodes += channels.map { it.animationNode }.distinct()
     }
@@ -117,8 +116,9 @@ class AnimatedTransformGroup(val target: Node) : AnimationNode {
     private val animRotation = MutableQuatF()
     private val animScale = MutableVec3f(1f, 1f, 1f)
 
-    private val baseRotation = MutableQuatF()
-    private val baseScale = MutableVec3f(Vec3f.ONES)
+    private val blendTranslation = MutableVec3f()
+    private val blendRotation = MutableQuatF()
+    private val blendScale = MutableVec3f()
 
     init {
         val vec4 = MutableVec4f()
@@ -151,11 +151,9 @@ class AnimatedTransformGroup(val target: Node) : AnimationNode {
             target.transform = t
         }
 
-        t.translate(animTranslation.mul(weight))
-        t.rotate(baseRotation.mix(animRotation, weight))
-        t.scale(baseScale.mix(animScale, weight))
-
-        t.markDirty()
+        t.translate(animTranslation.mul(weight, blendTranslation))
+        t.rotate(QuatF.IDENTITY.mix(animRotation, weight, blendRotation))
+        t.scale(Vec3f.ONES.mix(animScale, weight, blendScale))
     }
 
     override fun setTranslation(translation: Vec3f) {
diff --git a/kool-core/src/commonMain/kotlin/de/fabmax/kool/scene/animation/AnimationController.kt b/kool-core/src/commonMain/kotlin/de/fabmax/kool/scene/animation/AnimationController.kt
index 1479d16b1..9c393b4ef 100644
--- a/kool-core/src/commonMain/kotlin/de/fabmax/kool/scene/animation/AnimationController.kt
+++ b/kool-core/src/commonMain/kotlin/de/fabmax/kool/scene/animation/AnimationController.kt
@@ -9,9 +9,10 @@ class AnimationController(val model: Model) {
     private var currentState = initialState
 
     fun update(deltaTime: Float) {
-        states.forEach { state ->
+        for (i in states.indices) {
+            val state = states[i]
             val newState = state.update(deltaTime, state.name == currentState)
-            if(newState != currentState) {
+            if (newState != currentState) {
                 currentState = newState
                 state.onExit()
                 states.find { it.name == newState }?.onEnter?.invoke()
@@ -20,16 +21,17 @@ class AnimationController(val model: Model) {
         model.applyAnimation(deltaTime)
     }
 
-    fun state(stateName: String, body: AnimationState.() -> Unit) = AnimationState(model)
-        .apply(body).apply { name = stateName; states.add(this) }
+    fun state(stateName: String, body: AnimationState.() -> Unit) = AnimationState(model, stateName).apply {
+        body()
+        states.add(this)
+    }
 }
 
-class AnimationState(val model: Model) {
+class AnimationState(val model: Model, var name: String) {
     private val animations = mutableListOf<Animation>()
     private val transitions = mutableListOf<Transition>()
     private var weight = 0f
 
-    var name = ""
     var blendTransition = 0.2f
     var onEnter: () -> Unit = {}
     var onExit: () -> Unit = {}
@@ -38,7 +40,9 @@ class AnimationState(val model: Model) {
     fun update(deltaTime: Float, isActiveState: Boolean): String {
         updateWeight(deltaTime, isActiveState)
         onUpdate(deltaTime)
-        animations.forEach { it.update(deltaTime, weight) }
+        for (i in animations.indices) {
+            animations[i].update(deltaTime, weight)
+        }
         return transitions.firstOrNull { it.predicate() }?.nextState ?: name
     }