diff --git a/build.gradle b/build.gradle
index 46343283f..685a645e2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -33,7 +33,7 @@ java.toolchain.languageVersion = JavaLanguageVersion.of(16)
 println('Java: ' + System.getProperty('java.version') + ' JVM: ' + System.getProperty('java.vm.version') + '(' + System.getProperty('java.vendor') + ') Arch: ' + System.getProperty('os.arch'))
 minecraft {
     mappings channel: 'official', version: "${minecraft_version}"
-    accessTransformer = file('src/main/resources/META-INF/accesstransformer.cfg')
+    //accessTransformer = file('src/main/resources/META-INF/accesstransformer.cfg')
 
     runs {
         client {
diff --git a/src/main/java/com/jozufozu/flywheel/backend/gl/buffer/MappedBuffer.java b/src/main/java/com/jozufozu/flywheel/backend/gl/buffer/MappedBuffer.java
index 0fa839915..60c5e85f8 100644
--- a/src/main/java/com/jozufozu/flywheel/backend/gl/buffer/MappedBuffer.java
+++ b/src/main/java/com/jozufozu/flywheel/backend/gl/buffer/MappedBuffer.java
@@ -1,6 +1,7 @@
 package com.jozufozu.flywheel.backend.gl.buffer;
 
 import java.nio.ByteBuffer;
+import java.nio.FloatBuffer;
 
 import org.lwjgl.opengl.GL15;
 import org.lwjgl.system.MemoryUtil;
@@ -48,6 +49,12 @@ public abstract class MappedBuffer extends VecBuffer implements AutoCloseable {
 		return this;
 	}
 
+	public MappedBuffer put(FloatBuffer floats) {
+		checkAndMap();
+		super.put(floats);
+		return this;
+	}
+
 	public int position() {
 		checkAndMap();
 		return super.position();
diff --git a/src/main/java/com/jozufozu/flywheel/backend/gl/buffer/VecBuffer.java b/src/main/java/com/jozufozu/flywheel/backend/gl/buffer/VecBuffer.java
index 76fcfcccb..96171c80b 100644
--- a/src/main/java/com/jozufozu/flywheel/backend/gl/buffer/VecBuffer.java
+++ b/src/main/java/com/jozufozu/flywheel/backend/gl/buffer/VecBuffer.java
@@ -3,6 +3,7 @@ package com.jozufozu.flywheel.backend.gl.buffer;
 import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
+import java.nio.FloatBuffer;
 
 public class VecBuffer {
 
@@ -48,6 +49,15 @@ public class VecBuffer {
 		return this;
 	}
 
+	public VecBuffer put(FloatBuffer floats) {
+
+		int remainingBytes = floats.remaining() * 4;
+		internal.asFloatBuffer().put(floats);
+		internal.position(internal.position() + remainingBytes);
+
+		return this;
+	}
+
 	public int position() {
 		return internal.position();
 	}
diff --git a/src/main/java/com/jozufozu/flywheel/backend/gl/shader/GlProgram.java b/src/main/java/com/jozufozu/flywheel/backend/gl/shader/GlProgram.java
index 692002529..eade29843 100644
--- a/src/main/java/com/jozufozu/flywheel/backend/gl/shader/GlProgram.java
+++ b/src/main/java/com/jozufozu/flywheel/backend/gl/shader/GlProgram.java
@@ -6,6 +6,11 @@ import static org.lwjgl.opengl.GL20.glUniform1i;
 import static org.lwjgl.opengl.GL20.glUniformMatrix4fv;
 import static org.lwjgl.opengl.GL20.glUseProgram;
 
+import java.nio.FloatBuffer;
+
+import org.lwjgl.system.MemoryStack;
+import org.lwjgl.system.MemoryUtil;
+
 import com.jozufozu.flywheel.backend.Backend;
 import com.jozufozu.flywheel.backend.gl.GlObject;
 import com.jozufozu.flywheel.util.RenderUtil;
@@ -65,7 +70,10 @@ public abstract class GlProgram extends GlObject {
 	}
 
 	protected static void uploadMatrixUniform(int uniform, Matrix4f mat) {
-		glUniformMatrix4fv(uniform, false, RenderUtil.writeMatrix(mat));
+		FloatBuffer floatBuffer = MemoryStack.stackGet()
+				.mallocFloat(16);
+		mat.store(floatBuffer);
+		glUniformMatrix4fv(uniform, false, floatBuffer);
 	}
 
 	@Override
diff --git a/src/main/java/com/jozufozu/flywheel/core/materials/model/ModelData.java b/src/main/java/com/jozufozu/flywheel/core/materials/model/ModelData.java
index ff225c0ea..8b36c186e 100644
--- a/src/main/java/com/jozufozu/flywheel/core/materials/model/ModelData.java
+++ b/src/main/java/com/jozufozu/flywheel/core/materials/model/ModelData.java
@@ -1,5 +1,7 @@
 package com.jozufozu.flywheel.core.materials.model;
 
+import java.nio.FloatBuffer;
+
 import com.jozufozu.flywheel.backend.gl.buffer.VecBuffer;
 import com.jozufozu.flywheel.core.materials.BasicData;
 import com.jozufozu.flywheel.util.RenderUtil;
@@ -8,10 +10,14 @@ import com.mojang.blaze3d.vertex.PoseStack;
 public class ModelData extends BasicData {
 	private static final float[] empty = new float[25];
 
-	public float[] matrices = empty;
+	public final float[] matrices = empty.clone();
+	private final FloatBuffer buf = FloatBuffer.wrap(matrices);
 
 	public ModelData setTransform(PoseStack stack) {
-		matrices = RenderUtil.writeMatrixStack(stack);
+		this.buf.reset();
+
+		stack.last().pose().store(this.buf);
+		stack.last().normal().store(this.buf);
 		markDirty();
 		return this;
 	}
@@ -24,7 +30,8 @@ public class ModelData extends BasicData {
 	 * </p>
 	 */
 	public ModelData setEmptyTransform() {
-		matrices = empty;
+		this.buf.reset();
+		this.buf.put(empty);
 		markDirty();
 		return this;
 	}
@@ -32,6 +39,6 @@ public class ModelData extends BasicData {
 	@Override
 	public void write(VecBuffer buf) {
 		super.write(buf);
-		buf.putFloatArray(matrices);
+		buf.put(this.buf);
 	}
 }
diff --git a/src/main/java/com/jozufozu/flywheel/mixin/PausedPartialTickAccessor.java b/src/main/java/com/jozufozu/flywheel/mixin/PausedPartialTickAccessor.java
new file mode 100644
index 000000000..550f6d4ab
--- /dev/null
+++ b/src/main/java/com/jozufozu/flywheel/mixin/PausedPartialTickAccessor.java
@@ -0,0 +1,13 @@
+package com.jozufozu.flywheel.mixin;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+import net.minecraft.client.Minecraft;
+
+@Mixin(Minecraft.class)
+public interface PausedPartialTickAccessor {
+
+	@Accessor("pausePartialTick")
+	float getPausePartialTick();
+}
diff --git a/src/main/java/com/jozufozu/flywheel/util/AnimationTickHolder.java b/src/main/java/com/jozufozu/flywheel/util/AnimationTickHolder.java
index d5143f3a2..0a8374f42 100644
--- a/src/main/java/com/jozufozu/flywheel/util/AnimationTickHolder.java
+++ b/src/main/java/com/jozufozu/flywheel/util/AnimationTickHolder.java
@@ -1,5 +1,7 @@
 package com.jozufozu.flywheel.util;
 
+import com.jozufozu.flywheel.mixin.PausedPartialTickAccessor;
+
 import net.minecraft.client.Minecraft;
 
 public class AnimationTickHolder {
@@ -35,6 +37,6 @@ public class AnimationTickHolder {
 
 	public static float getPartialTicks() {
 		Minecraft mc = Minecraft.getInstance();
-		return (mc.isPaused() ? mc.pausePartialTick : mc.getFrameTime());
+		return (mc.isPaused() ? ((PausedPartialTickAccessor) mc).getPausePartialTick() : mc.getFrameTime());
 	}
 }
diff --git a/src/main/java/com/jozufozu/flywheel/util/RenderUtil.java b/src/main/java/com/jozufozu/flywheel/util/RenderUtil.java
index 857207939..7a06724ab 100644
--- a/src/main/java/com/jozufozu/flywheel/util/RenderUtil.java
+++ b/src/main/java/com/jozufozu/flywheel/util/RenderUtil.java
@@ -42,21 +42,6 @@ public class RenderUtil {
 		return Math.sqrt(lengthSqr(x, y, z));
 	}
 
-	public static float[] writeMatrixStack(PoseStack stack) {
-		return writeMatrixStack(stack.last()
-										.pose(), stack.last()
-										.normal());
-	}
-
-	// GPUs want matrices in column major order.
-	public static float[] writeMatrixStack(Matrix4f model, Matrix3f normal) {
-		return new float[]{model.m00, model.m10, model.m20, model.m30, model.m01, model.m11, model.m21, model.m31, model.m02, model.m12, model.m22, model.m32, model.m03, model.m13, model.m23, model.m33, normal.m00, normal.m10, normal.m20, normal.m01, normal.m11, normal.m21, normal.m02, normal.m12, normal.m22,};
-	}
-
-	public static float[] writeMatrix(Matrix4f model) {
-		return new float[]{model.m00, model.m10, model.m20, model.m30, model.m01, model.m11, model.m21, model.m31, model.m02, model.m12, model.m22, model.m32, model.m03, model.m13, model.m23, model.m33,};
-	}
-
 	public static Supplier<PoseStack> rotateToFace(Direction facing) {
 		return () -> {
 			PoseStack stack = new PoseStack();
diff --git a/src/main/resources/META-INF/accesstransformer.cfg b/src/main/resources/META-INF/accesstransformer.cfg
deleted file mode 100644
index d4a263750..000000000
--- a/src/main/resources/META-INF/accesstransformer.cfg
+++ /dev/null
@@ -1,31 +0,0 @@
-
-# Don't jitter when game is paused
-public net.minecraft.client.Minecraft f_91013_ #renderPartialTicksPaused
-
-# For uploading matrices as vertex attributes.
-public com.mojang.math.Matrix3f f_8134_ #a00
-public com.mojang.math.Matrix3f f_8135_ #a01
-public com.mojang.math.Matrix3f f_8136_ #a02
-public com.mojang.math.Matrix3f f_8137_ #a10
-public com.mojang.math.Matrix3f f_8138_ #a11
-public com.mojang.math.Matrix3f f_8139_ #a12
-public com.mojang.math.Matrix3f f_8140_ #a20
-public com.mojang.math.Matrix3f f_8141_ #a21
-public com.mojang.math.Matrix3f f_8142_ #a22
-
-public com.mojang.math.Matrix4f f_27603_ #a00
-public com.mojang.math.Matrix4f f_27604_ #a01
-public com.mojang.math.Matrix4f f_27605_ #a02
-public com.mojang.math.Matrix4f f_27606_ #a03
-public com.mojang.math.Matrix4f f_27607_ #a10
-public com.mojang.math.Matrix4f f_27608_ #a11
-public com.mojang.math.Matrix4f f_27609_ #a12
-public com.mojang.math.Matrix4f f_27610_ #a13
-public com.mojang.math.Matrix4f f_27611_ #a20
-public com.mojang.math.Matrix4f f_27612_ #a21
-public com.mojang.math.Matrix4f f_27613_ #a22
-public com.mojang.math.Matrix4f f_27614_ #a23
-public com.mojang.math.Matrix4f f_27615_ #a30
-public com.mojang.math.Matrix4f f_27616_ #a31
-public com.mojang.math.Matrix4f f_27617_ #a32
-public com.mojang.math.Matrix4f f_27618_ #a33
diff --git a/src/main/resources/flywheel.mixins.json b/src/main/resources/flywheel.mixins.json
index 30a4c08bb..b9cf08632 100644
--- a/src/main/resources/flywheel.mixins.json
+++ b/src/main/resources/flywheel.mixins.json
@@ -17,7 +17,8 @@
     "LevelRendererAccessor",
     "InstanceAddMixin",
     "InstanceRemoveMixin",
-    "LeakChunkStorageArrayMixin"
+    "LeakChunkStorageArrayMixin",
+    "PausedPartialTickAccessor"
   ],
   "injectors": {
     "defaultRequire": 1