diff --git a/postprocessor.py b/postprocessor.py
index ed0c6d0..adcb4d7 100644
--- a/postprocessor.py
+++ b/postprocessor.py
@@ -394,51 +394,50 @@ class PostProcessor(HDF5Container):
 
         self.def_rules()
 
-    def load_data(self, points_src, loaded, filename, save):
+    def load_data(self, points_src, filename, save):
         """
         Load data from the source file in the memory.
         (Long and memory heavy)
         """
-        if not loaded:
-            if os.path.exists(filename):
-                hdf5 = tables.open_file(filename, mode="r")
+        if os.path.exists(filename):
+            hdf5 = tables.open_file(filename, mode="r")
+            try:
+                node = hdf5.get_node("/data")
+                data = {}
+                for key in node._v_children:
+                    data[key] = hdf5.get_node("/data/" + key).read()
+            finally:
+                hdf5.close()
+        else:
+            data_pymses = points_src.flatten()
+            data = {}
+            for key in data_pymses.fields:
+                data[key] = data_pymses[key]
+            try:
+                data["dx"] = data_pymses.get_sizes()
+            except AttributeError:
+                pass
+            data["pos"] = data_pymses.points
+
+            if save:
+                hdf5 = tables.open_file(filename, mode="w")
                 try:
-                    node = hdf5.get_node("/data")
-                    data = {}
-                    for key in node._v_children:
-                        data[key] = hdf5.get_node("/data/" + key).read()
+                    for key in data:
+                        hdf5.create_array(
+                            "/data", key, data[key], "", createparents=True
+                        )
                 finally:
                     hdf5.close()
-            else:
-                data_pymses = points_src.flatten()
-                data = {}
-                for key in data_pymses.fields:
-                    data[key] = data_pymses[key]
-                try:
-                    data["dx"] = data_pymses.get_sizes()
-                except AttributeError:
-                    pass
-                data["pos"] = data_pymses.points
-
-                if save:
-                    hdf5 = tables.open_file(filename, mode="w")
-                    try:
-                        for key in data:
-                            hdf5.create_array(
-                                "/data", key, data[key], "", createparents=True
-                            )
-                    finally:
-                        hdf5.close()
-            return data
+        return data
 
     def load_parts(self):
-        self.parts = self.load_data(
-            self._part,
-            self.parts_loaded,
-            self.parts_filename,
-            self.pp_params.process.save_parts,
-        )
-        self.parts_loaded = True
+        if not self.parts_loaded:
+            self.parts = self.load_data(
+                self._part,
+                self.parts_filename,
+                self.pp_params.process.save_parts,
+            )
+            self.parts_loaded = True
 
     def unload_parts(self):
         """
@@ -455,14 +454,14 @@ class PostProcessor(HDF5Container):
         Cells will be accessible trough self.cells
         (Long and memory heavy)
         """
-        cells_src = CellsToPoints(self._amr)
-        self.cells = self.load_data(
-            cells_src,
-            self.cells_loaded,
-            self.cells_filename,
-            self.pp_params.process.save_cells,
-        )
-        self.parts_loaded = True
+        if not self.cells_loaded:
+            cells_src = CellsToPoints(self._amr)
+            self.cells = self.load_data(
+                cells_src,
+                self.cells_filename,
+                self.pp_params.process.save_cells,
+            )
+            self.cells_loaded = True
 
     def unload_cells(self):
         """