diff --git a/environments/factory/additional/dirt/dirt_collections.py b/environments/factory/additional/dirt/dirt_collections.py
index 1b56159..06b30d4 100644
--- a/environments/factory/additional/dirt/dirt_collections.py
+++ b/environments/factory/additional/dirt/dirt_collections.py
@@ -28,6 +28,8 @@ class DirtPiles(EntityCollection):
             if not self.amount > self.dirt_properties.max_global_amount:
                 dirt = self.by_pos(tile.pos)
                 if dirt is None:
+                    if len(tile.guests) > 1:
+                        return c.NOT_VALID
                     dirt = DirtPile(tile, self, amount=self.dirt_properties.max_spawn_amount)
                     self.add_item(dirt)
                 else:
diff --git a/environments/factory/base/base_factory.py b/environments/factory/base/base_factory.py
index 2c90c48..dab691d 100644
--- a/environments/factory/base/base_factory.py
+++ b/environments/factory/base/base_factory.py
@@ -541,8 +541,7 @@ class BaseFactory(gym.Env):
         if not self._renderer:  # lazy init
             from environments.factory.base.renderer import Renderer, RenderEntity
             global Renderer, RenderEntity
-            height, width = self._level_shape
-            self._renderer = Renderer(width, height, view_radius=self._pomdp_r, fps=5)
+            self._renderer = Renderer(self._level_shape, view_radius=self._pomdp_r, fps=7)
 
         # noinspection PyUnboundLocalVariable
         walls = [RenderEntity('wall', wall.pos) for wall in self[c.WALLS]]