diff --git a/gns3server/controller/shape.py b/gns3server/controller/shape.py
index 71de96cf..e3e9f64b 100644
--- a/gns3server/controller/shape.py
+++ b/gns3server/controller/shape.py
@@ -89,10 +89,17 @@ class Shape:
         """
 
         # Update node properties with additional elements
+        svg_changed = False
         for prop in kwargs:
             if getattr(self, prop) != kwargs[prop]:
+                if prop == "svg":
+                    # To avoid spamming client with large data we don't send the svg if the SVG didn't change
+                    svg_changed = True
                 setattr(self, prop, kwargs[prop])
-        self._project.controller.notification.emit("shape.updated", self.__json__())
+        data = self.__json__()
+        if not svg_changed:
+            del data["svg"]
+        self._project.controller.notification.emit("shape.updated", data)
         self._project.dump()
 
     def __json__(self, topology_dump=False):
diff --git a/gns3server/schemas/shape.py b/gns3server/schemas/shape.py
index cac29d16..c4af2688 100644
--- a/gns3server/schemas/shape.py
+++ b/gns3server/schemas/shape.py
@@ -56,7 +56,7 @@ SHAPE_OBJECT_SCHEMA = {
         "svg": {
             "description": "SVG content of the shape",
             "type": "string",
-            "pattern": "^<.+>$"
+            "pattern": "^<(.|[\r\n])+>$"
         }
     },
     "additionalProperties": False
diff --git a/tests/controller/test_shape.py b/tests/controller/test_shape.py
index aa9b069a..93b3c2a1 100644
--- a/tests/controller/test_shape.py
+++ b/tests/controller/test_shape.py
@@ -72,7 +72,21 @@ def test_update(shape, project, async_run, controller):
     controller._notification = AsyncioMagicMock()
     project.dump = MagicMock()
 
-    async_run(shape.update(x=42))
+    async_run(shape.update(x=42, svg="<svg><rect></rect></svg>"))
     assert shape.x == 42
-    controller._notification.emit.assert_called_with("shape.updated", shape.__json__())
+    args, kwargs = controller._notification.emit.call_args
+    assert args[0] == "shape.updated"
+    # JSON
+    assert args[1]["x"] == 42
+    assert args[1]["svg"] == "<svg><rect></rect></svg>"
+
+    async_run(shape.update(x=12, svg="<svg><rect></rect></svg>"))
+    assert shape.x == 12
+    args, kwargs = controller._notification.emit.call_args
+    assert args[0] == "shape.updated"
+    # JSON
+    assert args[1]["x"] == 12
+    # To avoid spamming client with large data we don't send the svg if the SVG didn't change
+    assert "svg" not in args[1]
+
     assert project.dump.called