diff --git a/src/main/java/de/bixilon/minosoft/gui/rendering/system/opengl/buffer/vertex/FloatOpenGLVertexBuffer.kt b/src/main/java/de/bixilon/minosoft/gui/rendering/system/opengl/buffer/vertex/FloatOpenGLVertexBuffer.kt
index bb97d7197..6739d5cef 100644
--- a/src/main/java/de/bixilon/minosoft/gui/rendering/system/opengl/buffer/vertex/FloatOpenGLVertexBuffer.kt
+++ b/src/main/java/de/bixilon/minosoft/gui/rendering/system/opengl/buffer/vertex/FloatOpenGLVertexBuffer.kt
@@ -5,7 +5,6 @@ import de.bixilon.minosoft.gui.rendering.system.base.buffer.vertex.FloatVertexBu
 import de.bixilon.minosoft.gui.rendering.system.base.buffer.vertex.PrimitiveTypes
 import de.bixilon.minosoft.gui.rendering.system.opengl.buffer.FloatOpenGLBuffer
 import de.bixilon.minosoft.gui.rendering.util.mesh.MeshStruct
-import de.bixilon.minosoft.util.KUtil.clean
 import org.lwjgl.opengl.ARBVertexArrayObject.glBindVertexArray
 import org.lwjgl.opengl.ARBVertexArrayObject.glGenVertexArrays
 import org.lwjgl.opengl.GL11.*
@@ -33,7 +32,6 @@ class FloatOpenGLVertexBuffer(override val structure: MeshStruct, data: FloatBuf
         glBufferData(type.gl, buffer, drawTypes.gl)
         state = RenderBufferStates.UPLOADED
 
-        buffer.clean()
         _data = null
 
 
diff --git a/src/main/java/de/bixilon/minosoft/gui/rendering/util/mesh/Mesh.kt b/src/main/java/de/bixilon/minosoft/gui/rendering/util/mesh/Mesh.kt
index 2a329046a..10e42befe 100644
--- a/src/main/java/de/bixilon/minosoft/gui/rendering/util/mesh/Mesh.kt
+++ b/src/main/java/de/bixilon/minosoft/gui/rendering/util/mesh/Mesh.kt
@@ -16,7 +16,7 @@ package de.bixilon.minosoft.gui.rendering.util.mesh
 import de.bixilon.minosoft.gui.rendering.RenderWindow
 import de.bixilon.minosoft.gui.rendering.system.base.buffer.vertex.FloatVertexBuffer
 import de.bixilon.minosoft.gui.rendering.system.base.buffer.vertex.PrimitiveTypes
-import de.bixilon.minosoft.util.collections.ArrayFloatList
+import de.bixilon.minosoft.util.collections.DirectArrayFloatList
 import glm_.vec2.Vec2
 import glm_.vec3.Vec3
 
@@ -27,8 +27,8 @@ abstract class Mesh(
     initialCacheSize: Int = 10000,
 ) {
     val order = renderWindow.renderSystem.primitiveMeshOrder
-    private var _data: ArrayFloatList? = ArrayFloatList(initialCacheSize)
-    var data: ArrayFloatList
+    private var _data: DirectArrayFloatList? = DirectArrayFloatList(initialCacheSize)
+    var data: DirectArrayFloatList
         get() = _data!!
         set(value) {
             _data = value
@@ -45,8 +45,9 @@ abstract class Mesh(
 
     fun load() {
         buffer = renderWindow.renderSystem.createVertexBuffer(struct, data.buffer, primitiveType)
-        _data = null
         buffer.init()
+        data.unload()
+        _data = null
         vertices = buffer.vertices
     }
 
diff --git a/src/main/java/de/bixilon/minosoft/util/KUtil.kt b/src/main/java/de/bixilon/minosoft/util/KUtil.kt
index f0f781afa..53b046608 100644
--- a/src/main/java/de/bixilon/minosoft/util/KUtil.kt
+++ b/src/main/java/de/bixilon/minosoft/util/KUtil.kt
@@ -33,7 +33,6 @@ import glm_.vec2.Vec2t
 import glm_.vec3.Vec3t
 import glm_.vec4.Vec4t
 import okio.Buffer
-import org.lwjgl.system.MemoryUtil.memFree
 import sun.misc.Unsafe
 import java.io.PrintWriter
 import java.io.StringWriter
@@ -506,8 +505,4 @@ object KUtil {
         this.get(array)
         return array
     }
-
-    fun java.nio.Buffer.clean() {
-        memFree(this)
-    }
 }
diff --git a/src/main/java/de/bixilon/minosoft/util/collections/ArrayFloatList.kt b/src/main/java/de/bixilon/minosoft/util/collections/ArrayFloatList.kt
index 73a6fabfa..5d763e886 100644
--- a/src/main/java/de/bixilon/minosoft/util/collections/ArrayFloatList.kt
+++ b/src/main/java/de/bixilon/minosoft/util/collections/ArrayFloatList.kt
@@ -1,34 +1,27 @@
 /*
- * Minosoft
- * Copyright (C) 2021 Moritz Zwerger
- *
- * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- * This software is not affiliated with Mojang AB, the original developer of Minecraft.
- */
-
+* Minosoft
+* Copyright (C) 2021 Moritz Zwerger
+*
+* This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
+*
+* This software is not affiliated with Mojang AB, the original developer of Minecraft.
+*/
 package de.bixilon.minosoft.util.collections
 
-import de.bixilon.minosoft.util.KUtil
-import de.bixilon.minosoft.util.KUtil.clean
-import org.lwjgl.system.MemoryUtil.memAllocFloat
-import java.nio.FloatBuffer
-
 class ArrayFloatList(
     initialSize: Int = DEFAULT_INITIAL_SIZE,
 ) {
-    var buffer: FloatBuffer = memAllocFloat(initialSize) // ToDo: Clear when disconnected
-        private set
+    private var data: FloatArray = FloatArray(initialSize)
     var finalized: Boolean = false
         private set
-    val capacity: Int
-        get() = buffer.capacity()
-    val size: Int
-        get() = buffer.position()
+    val limit: Int
+        get() = data.size
+    var size = 0
+        private set
     val isEmpty: Boolean
         get() = size == 0
 
@@ -49,66 +42,55 @@ class ArrayFloatList(
 
     fun clear() {
         checkFinalized()
-        buffer.clean()
+        size = 0
         outputUpToDate = false
         output = FloatArray(0)
     }
 
     private fun ensureSize(needed: Int) {
         checkFinalized()
-        if (capacity - size >= needed) {
+        if (limit - size >= needed) {
             return
         }
-        var newSize = capacity
+        var newSize = data.size
         while (newSize - size < needed) {
             newSize += nextGrowStep
         }
-        val oldBuffer = buffer
-        buffer = memAllocFloat(newSize)
-        if (FLOAT_PUT_METHOD == null) { // Java < 16
-            for (i in 0 until oldBuffer.position()) {
-                buffer.put(oldBuffer.get(i))
-            }
-        } else {
-            FLOAT_PUT_METHOD.invoke(buffer, 0, oldBuffer, 0, oldBuffer.position())
-            buffer.position(oldBuffer.position())
-        }
-        oldBuffer.clean()
+        val oldData = data
+        data = FloatArray(newSize)
+        System.arraycopy(oldData, 0, data, 0, oldData.size)
     }
 
     fun add(float: Float) {
         ensureSize(1)
-        buffer.put(float)
+        data[size++] = float
         outputUpToDate = false
     }
 
     fun addAll(floats: FloatArray) {
         ensureSize(floats.size)
-        buffer.put(floats)
+        System.arraycopy(floats, 0, data, size, floats.size)
+        size += floats.size
         outputUpToDate = false
     }
 
     fun addAll(floatList: ArrayFloatList) {
         ensureSize(floatList.size)
-        if (FLOAT_PUT_METHOD == null) { // Java < 16
-            for (i in 0 until floatList.buffer.position()) {
-                buffer.put(floatList.buffer.get(i))
-            }
+        val source = if (floatList.finalized) {
+            floatList.output
         } else {
-            FLOAT_PUT_METHOD.invoke(buffer, buffer.position(), floatList.buffer, 0, floatList.buffer.position())
-            buffer.position(buffer.position() + floatList.buffer.position())
+            floatList.data
         }
+        System.arraycopy(source, 0, data, size, floatList.size)
+        size += floatList.size
     }
 
     private fun checkOutputArray() {
         if (outputUpToDate) {
             return
         }
-        val position = buffer.position()
-        output = FloatArray(position)
-        buffer.position(0)
-        buffer.get(output, 0, position)
-        buffer.position(position)
+        output = FloatArray(size)
+        System.arraycopy(data, 0, output, 0, size)
         outputUpToDate = true
     }
 
@@ -119,22 +101,12 @@ class ArrayFloatList(
 
     fun finish() {
         finalized = true
-        val oldBuffer = buffer
-        buffer = memAllocFloat(oldBuffer.position())
-        if (FLOAT_PUT_METHOD == null) { // Java < 16
-            for (i in 0 until oldBuffer.position()) {
-                buffer.put(oldBuffer.get(i))
-            }
-        } else {
-            FLOAT_PUT_METHOD.invoke(buffer, 0, oldBuffer, 0, oldBuffer.position())
-            buffer.position(buffer.limit())
-        }
-        oldBuffer.clean()
+        checkOutputArray()
+        data = FloatArray(0)
     }
 
 
     private companion object {
-        private val FLOAT_PUT_METHOD = KUtil.tryCatch { FloatBuffer::class.java.getMethod("put", Int::class.java, FloatBuffer::class.java, Int::class.java, Int::class.java) }
         private const val DEFAULT_INITIAL_SIZE = 1000
     }
 }
diff --git a/src/main/java/de/bixilon/minosoft/util/collections/DirectArrayFloatList.kt b/src/main/java/de/bixilon/minosoft/util/collections/DirectArrayFloatList.kt
new file mode 100644
index 000000000..e9772b392
--- /dev/null
+++ b/src/main/java/de/bixilon/minosoft/util/collections/DirectArrayFloatList.kt
@@ -0,0 +1,153 @@
+/*
+ * Minosoft
+ * Copyright (C) 2021 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.util.collections
+
+import de.bixilon.minosoft.util.KUtil
+import org.lwjgl.system.MemoryUtil.memAllocFloat
+import org.lwjgl.system.MemoryUtil.memFree
+import java.nio.FloatBuffer
+
+class DirectArrayFloatList(
+    initialSize: Int = DEFAULT_INITIAL_SIZE,
+) {
+    var buffer: FloatBuffer = memAllocFloat(initialSize) // ToDo: Clear when disconnected
+        private set
+    var finalized: Boolean = false
+        private set
+    val capacity: Int
+        get() = buffer.capacity()
+    val size: Int
+        get() = buffer.position()
+    val isEmpty: Boolean
+        get() = size == 0
+    private var unloaded = false
+
+    private val nextGrowStep = when {
+        initialSize <= 0 -> DEFAULT_INITIAL_SIZE
+        initialSize <= 50 -> 50
+        else -> initialSize
+    }
+
+    private var output: FloatArray = FloatArray(0)
+    private var outputUpToDate = false
+
+    private fun checkFinalized() {
+        if (finalized) {
+            throw IllegalStateException("ArrayFloatList is already finalized!")
+        }
+    }
+
+    private fun ensureSize(needed: Int) {
+        checkFinalized()
+        if (capacity - size >= needed) {
+            return
+        }
+        var newSize = capacity
+        while (newSize - size < needed) {
+            newSize += nextGrowStep
+        }
+        val oldBuffer = buffer
+        buffer = memAllocFloat(newSize)
+        if (FLOAT_PUT_METHOD == null) { // Java < 16
+            for (i in 0 until oldBuffer.position()) {
+                buffer.put(oldBuffer.get(i))
+            }
+        } else {
+            FLOAT_PUT_METHOD.invoke(buffer, 0, oldBuffer, 0, oldBuffer.position())
+            buffer.position(oldBuffer.position())
+        }
+        memFree(oldBuffer)
+    }
+
+    fun add(float: Float) {
+        ensureSize(1)
+        buffer.put(float)
+        outputUpToDate = false
+    }
+
+    fun addAll(floats: FloatArray) {
+        ensureSize(floats.size)
+        buffer.put(floats)
+        outputUpToDate = false
+    }
+
+    fun addAll(floatList: DirectArrayFloatList) {
+        ensureSize(floatList.size)
+        if (FLOAT_PUT_METHOD == null) { // Java < 16
+            for (i in 0 until floatList.buffer.position()) {
+                buffer.put(floatList.buffer.get(i))
+            }
+        } else {
+            FLOAT_PUT_METHOD.invoke(buffer, buffer.position(), floatList.buffer, 0, floatList.buffer.position())
+            buffer.position(buffer.position() + floatList.buffer.position())
+        }
+    }
+
+    fun addAll(floatList: ArrayFloatList) {
+        ensureSize(floatList.size)
+        buffer.put(floatList.toArray())
+    }
+
+    private fun checkOutputArray() {
+        if (outputUpToDate) {
+            return
+        }
+        val position = buffer.position()
+        output = FloatArray(position)
+        buffer.position(0)
+        buffer.get(output, 0, position)
+        buffer.position(position)
+        outputUpToDate = true
+    }
+
+    fun toArray(): FloatArray {
+        checkOutputArray()
+        return output
+    }
+
+    fun unload() {
+        check(!unloaded) { "Already unloaded!" }
+        unloaded = true
+        finalized = true // Is unloaded
+        memFree(buffer)
+    }
+
+    fun finish() {
+        finalized = true
+        val oldBuffer = buffer
+        buffer = memAllocFloat(oldBuffer.position())
+        if (FLOAT_PUT_METHOD == null) { // Java < 16
+            for (i in 0 until oldBuffer.position()) {
+                buffer.put(oldBuffer.get(i))
+            }
+        } else {
+            FLOAT_PUT_METHOD.invoke(buffer, 0, oldBuffer, 0, oldBuffer.position())
+            buffer.position(buffer.limit())
+        }
+        memFree(oldBuffer)
+    }
+
+    protected fun finalize() {
+        if (unloaded) {
+            return
+        }
+        memFree(buffer)
+    }
+
+
+    private companion object {
+        private val FLOAT_PUT_METHOD = KUtil.tryCatch { FloatBuffer::class.java.getMethod("put", Int::class.java, FloatBuffer::class.java, Int::class.java, Int::class.java) }
+        private const val DEFAULT_INITIAL_SIZE = 1000
+    }
+}