diff --git a/game/game.py b/game/game.py
index bb7ef21..7b3b446 100644
--- a/game/game.py
+++ b/game/game.py
@@ -13,6 +13,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from time import thread_time
 from math import pi, tau, dist
 
 from engine import *
@@ -32,7 +33,7 @@ from game.environment import Environment
 from game.inputs import InputFloat
 from game.batch import Batch
 from game.entity import Entity
-from game.scene import SceneNode, TextureNode, ShaderNode, InputNode, DrawNode, FuncNode
+from game.scene import Node, SceneNode, TextureNode, ShaderNode, InputNode, DrawNode, FuncNode
 from game import sea
 
 proj_hfov = pi * 0.25
@@ -43,6 +44,34 @@ proj_far_z = 3000.0
 sun_direction = math.vec3_normalize((1.0, 0.0, 0.5))
 sun_power = 1.0
 
+class PerfNode(Node):
+    __slots__ = '_count', '_min', '_max', '_total', '_name'
+
+    def __init__(self, name, *subnodes):
+        Node.__init__(self, *subnodes)
+        self._count = None
+        self._min = 10000.0
+        self._max = 0.0
+        self._total = 0.0
+        self._name = name
+
+    def __del__(self):
+        avg = round(self._total / self._count, 2)
+        print(self._name, "*", self._count,
+            ": min =", round(self._min, 2), ", max =", round(self._max, 2), ", avg =", avg, "(ms)")
+
+    def draw(self, time):
+        begin = thread_time()
+        Node.draw(self, time)
+        elapsed = (thread_time() - begin) * 1000.0
+        if self._count is None:
+            self._count = 0
+        else:
+            self._count += 1
+            self._min = min(self._min, elapsed)
+            self._max = max(self._max, elapsed)
+            self._total += elapsed
+
 class TestEntity(Entity):
     __slots__ = 'translation', 'orientation', 'spawn_translation', 'spawn_orientation'
 
@@ -158,30 +187,26 @@ def create_scene(keyboard, mouse):
     sea_triangles = sea.sea_triangles(64, proj_far_z - 0.1, proj_ratio)
 
     return SceneNode(
-        TextureNode({1: heightmap, 2: normalmap},
-            FuncNode(update_camera, (mouse, camera, environment)),
-            TextureNode({0: tiles_texture},
-                ShaderNode(tiles_shader,
-                    InputNode(tiles_shader, camera, environment),
-                    DrawNode(tiles_batch)
-                )
-            ),
-            FuncNode(update_tests, (blob, cube, clouds)),
-            TextureNode({0: tests_texture},
-                ShaderNode(tests_shader,
-                    InputNode(tests_shader, camera, environment),
-                    DrawNode(tests_batch)
-                )
-            )
-        ),
-        FuncNode(update_sea, (camera, sea_phase)),
-        TextureNode({0: sea_polar_textures, 1: sea_detail_texture},
-            ShaderNode(sea_shader,
-                InputNode(sea_shader, camera, environment, sea_phase),
-                DrawNode(sea_triangles)
-            )
-        )
-    )
+        PerfNode('frame',
+            TextureNode({1: heightmap, 2: normalmap},
+                FuncNode(update_camera, (mouse, camera, environment)),
+                TextureNode({0: tiles_texture},
+                    ShaderNode(tiles_shader,
+                        InputNode(tiles_shader, camera, environment),
+                        PerfNode('tiles_batch',
+                            DrawNode(tiles_batch)))),
+                FuncNode(update_tests, (blob, cube, clouds)),
+                TextureNode({0: tests_texture},
+                    ShaderNode(tests_shader,
+                        InputNode(tests_shader, camera, environment),
+                        PerfNode('tests_batch',
+                            DrawNode(tests_batch))))),
+            FuncNode(update_sea, (camera, sea_phase)),
+            TextureNode({0: sea_polar_textures, 1: sea_detail_texture},
+                ShaderNode(sea_shader,
+                    InputNode(sea_shader, camera, environment, sea_phase),
+                    PerfNode('sea_triangles',
+                        DrawNode(sea_triangles))))))
 
 def loop(display):
     events = Events(display)