diff --git a/src/main/kotlin/Game.kt b/src/main/kotlin/Game.kt
index 0049340..ebbf803 100644
--- a/src/main/kotlin/Game.kt
+++ b/src/main/kotlin/Game.kt
@@ -19,8 +19,6 @@ import com.badlogic.gdx.utils.Array
 import com.badlogic.gdx.utils.ScreenUtils
 import gay.pizza.CavesOfJolk.Resources.Companion.assetManager
 import ktx.math.times
-import org.lwjgl.system.MathUtil
-import kotlin.random.Random
 
 class Game: ApplicationAdapter()
 {
@@ -40,7 +38,7 @@ class Game: ApplicationAdapter()
 	private lateinit var cubeInstance: ModelInstance
 	private lateinit var floorInstance: ModelInstance
 	private lateinit var suzanneInstance: ModelInstance
-	private lateinit var rocks: kotlin.Array<ModelInstance>
+	private lateinit var rockBatch: ModelCache
 
 	private fun makeCube(texture: Texture): Model
 	{
@@ -186,7 +184,7 @@ class Game: ApplicationAdapter()
 			val s = kotlin.math.sqrt((1.0f - z) / w)
 			Quaternion(x, y, s * u, s * v)
 		}
-		rocks = Array(50) { i->
+		val rocks = Array(50) { i->
 			ModelInstance(rock, Matrix4(
 				Vector3(
 					rand.nextFloat(16.0f),
@@ -195,6 +193,12 @@ class Game: ApplicationAdapter()
 				randQuaternion(rand),
 				Util.one * rand.nextFloat(0.6f, 1.2f)))
 		}
+		rockBatch = ModelCache().apply {
+			begin()
+			add(rocks.asIterable())
+			end()
+		}
+
 		suzanneInstance.transform = Matrix4().translate(3.0f, 1.0f, -3.5f)
 	}
 
@@ -253,7 +257,7 @@ class Game: ApplicationAdapter()
 
 		modelBatch.begin(colin.camera)
 		modelBatch.render(floorInstance, env)
-		modelBatch.render(rocks.asIterable(), env)
+		modelBatch.render(rockBatch, env)
 		modelBatch.render(cubeInstance, env)
 		modelBatch.render(suzanneInstance, env)
 		modelBatch.end()
@@ -269,6 +273,7 @@ class Game: ApplicationAdapter()
 
 	override fun dispose()
 	{
+		rockBatch.dispose()
 		floor.dispose()
 		cube.dispose()
 		modelBatch.dispose()