diff --git a/engine b/engine
index 3df976c..5c9e10e 160000
--- a/engine
+++ b/engine
@@ -1 +1 @@
-Subproject commit 3df976c154f76351702fe9f512f09c072dd67f60
+Subproject commit 5c9e10eea8059353c7bd8d48e669a9009b60c218
diff --git a/game/batch.py b/game/batch.py
index 0966230..036f5cb 100644
--- a/game/batch.py
+++ b/game/batch.py
@@ -19,32 +19,34 @@ from engine import (
     INSTANCE_FLAG_SPAWNED, BATCH_MAX_SIZE, create_batch, draw_batch, destroy_batch)
 
 class Batch:
-    __slots__ = '_batch', 'max_size', 'flags', 'meshes', 'params'
+    __slots__ = '_batch', 'max_size', 'format', 'flags', 'meshes', 'params'
 
     def __init__(self, max_size, params_format):
         assert max_size <= BATCH_MAX_SIZE
         self._batch = create_batch(max_size, params_format)
         self.max_size = max_size
+        self.format = params_format
         self.flags = array('B')
         self.meshes = array('I')
-        self.params = [array('f') for _ in params_format]
+        self.params = array('f')
 
     def __del__(self):
         destroy_batch(self._batch)
 
     def append(self, flags, mesh, params):
-        assert len(params) == len(self.params)
+        assert len(params) == len(self.format)
         index = len(self.flags)
         assert index < self.max_size
         self.flags.append(flags | INSTANCE_FLAG_SPAWNED)
         self.meshes.append(mesh)
-        for _params, param in zip(self.params, params):
-            _params.extend(param)
-        return index
+        def append_param(param):
+            start = len(self.params)
+            self.params.extend(param)
+            return slice(start, len(self.params))
+        return tuple(map(append_param, params))
 
-    def set_param(self, param, index, value):
-        size = len(value)
-        self.params[param][index * size : index * size + size] = value
+    def set_param(self, param, id, value):
+        self.params[id[param]] = value
 
     def draw(self):
         draw_batch(self._batch, self.flags, self.meshes, self.params)
diff --git a/game/game.py b/game/game.py
index 7293b8d..cb3228f 100644
--- a/game/game.py
+++ b/game/game.py
@@ -97,7 +97,8 @@ def main():
     cube = archive.get_model('cube')
     clouds = archive.get_model('clouds')
     select_vertices(tests_vertices)
-    tests_batch = batch.Batch(3, params_format(PARAM_FORMAT_VEC3_FLOAT, PARAM_FORMAT_VEC3_FLOAT))
+    tests_batch = batch.Batch(3,
+        params_format(PARAM_FORMAT_VEC3_FLOAT, PARAM_FORMAT_VEC3_INT10 | PARAM_FORMAT_NORMALIZE))
     blob_translation = vec3((-100.0, -500.0, 0.0))
     cube_translation = vec3((100.0, -500.0, 0.0))
     cube_orientation = vec3(vec3_forward)
@@ -151,7 +152,7 @@ def main():
     perf_count = 0
     try:
         for frame in range(10000):
-            current_time = 0 #time.monotonic() - start_time
+            current_time = time.monotonic() - start_time
 
             begin_frame()
             frame_begin = time.thread_time()
@@ -247,9 +248,9 @@ def main():
     # lookat = vec3((0.0,  500.0, -500.0))
     # for x in range(10000)
     # current_time = 0
-    # Draw  * 9999 : min = 0.18 , max = 1.98 , avg = 0.24 ms
-    # Draw  * 9999 : min = 0.21 , max = 2.19 , avg = 0.27 ms
-    # Draw  * 9999 : min = 0.19 , max = 2.13 , avg = 0.25 ms
+    # Draw  * 9999 : min = 0.2 , max = 2.16 , avg = 0.26 ms
+    # Draw  * 9999 : min = 0.2 , max = 2.77 , avg = 0.27 ms
+    # Draw  * 9999 : min = 0.2 , max = 2.00 , avg = 0.27 ms
 
     print("Quitting...")
     del tests_batch