diff --git a/__init__.py b/__init__.py
index 2ef6127..1169a46 100644
--- a/__init__.py
+++ b/__init__.py
@@ -22,7 +22,8 @@ from . import environment, utils
 DEPENDENCIES = {
     ("zmq","zmq"),
     ("umsgpack","umsgpack"),
-    ("yaml","pyyaml")
+    ("yaml","pyyaml"),
+    ("jsondiff","jsondiff")
 }
 
 
diff --git a/bl_types/bl_camera.py b/bl_types/bl_camera.py
index a8ad93c..c8e2cdc 100644
--- a/bl_types/bl_camera.py
+++ b/bl_types/bl_camera.py
@@ -1,5 +1,6 @@
 import bpy
 import mathutils
+from jsondiff import diff
 
 from .. import utils
 from .bl_datablock import BlDatablock
@@ -27,7 +28,9 @@ class BlCamera(BlDatablock):
         self.pointer = bpy.data.cameras.get(self.buffer['name'])
     
     def diff(self):
-        return False
+        d = diff(self.dump(pointer=self.pointer),self.buffer)
+        print(d)
+        return len(d)>1
 
 bl_id = "cameras"
 bl_class = bpy.types.Camera
diff --git a/bl_types/bl_material.py b/bl_types/bl_material.py
index 61b9633..1884535 100644
--- a/bl_types/bl_material.py
+++ b/bl_types/bl_material.py
@@ -82,11 +82,11 @@ class BlMaterial(BlDatablock):
 
     def diff(self):
         if self.pointer.is_grease_pencil:
-            self.dump(pointer=self.pointer) != self.buffer
+            return self.dump(pointer=self.pointer) != self.buffer
         else:
             return len(self.pointer.node_tree.links) != len(self.buffer['node_tree']['links'])
 bl_id = "materials"
 bl_class = bpy.types.Material
 bl_rep_class = BlMaterial
-bl_delay_refresh = 1
-bl_delay_apply = 1
+bl_delay_refresh = 5
+bl_delay_apply = 5
diff --git a/libs/replication b/libs/replication
index 929f624..414fc66 160000
--- a/libs/replication
+++ b/libs/replication
@@ -1 +1 @@
-Subproject commit 929f624919a1b56c4b5a00b824ad9f309ee403c4
+Subproject commit 414fc6629e90e2b3bd36d279e2a7ded8ade786da