diff --git a/environments/logging/recorder.py b/environments/logging/recorder.py
index 893a0a3..bf83959 100644
--- a/environments/logging/recorder.py
+++ b/environments/logging/recorder.py
@@ -7,6 +7,7 @@ from typing import Union
 import numpy as np
 import pandas as pd
 import simplejson
+from deepdiff.operator import BaseOperator
 from stable_baselines3.common.callbacks import BaseCallback
 
 from environments.factory.base.base_factory import REC_TAC
@@ -71,16 +72,29 @@ class EnvRecorder(BaseCallback):
         self._on_training_end()
         return True
 
-    def save_records(self, filepath: Union[Path, str, None] = None, save_occupation_map=False, save_trajectory_map=False):
+    def save_records(self, filepath: Union[Path, str, None] = None,
+                     only_deltas=True,
+                     save_occupation_map=False,
+                     save_trajectory_map=False,
+                     ):
         filepath = Path(filepath or self.filepath)
         filepath.parent.mkdir(exist_ok=True, parents=True)
         # cls.out_file.unlink(missing_ok=True)
         with filepath.open('w') as f:
-            out_dict = {'n_episodes': self._episode_counter,
-                        'env_params': self.unwrapped.params,
-                        'header': self.unwrapped.summarize_header,
-                        'episodes': self._recorder_out_list
-                        }
+            if only_deltas:
+                from deepdiff import DeepDiff, Delta
+                diff_dict = [DeepDiff(t1,t2, ignore_order=True)
+                             for t1, t2 in zip(self._recorder_out_list, self._recorder_out_list[1:])
+                             ]
+                out_dict = {'episodes': diff_dict}
+
+            else:
+                out_dict = {'episodes': self._recorder_out_list}
+            out_dict.update(
+                {'n_episodes': self._episode_counter,
+                 'env_params': self.unwrapped.params,
+                 'header': self.unwrapped.summarize_header
+                 })
             try:
                 simplejson.dump(out_dict, f, indent=4)
             except TypeError: