diff --git a/iwla.py b/iwla.py
index ac7fca6..7eb0940 100755
--- a/iwla.py
+++ b/iwla.py
@@ -235,15 +235,18 @@ class IWLA(object):
     def getDBFilename(self, time):
         return os.path.join(conf.DB_ROOT, str(time.tm_year), '%02d' % (time.tm_mon), conf.DB_FILENAME)
 
+    def _openDB(self, filename, prot='r'):
+        if self.args.dont_compress:
+            return open(filename, prot)
+        else:
+            return gzip.open(filename, prot)
+
     def _serialize(self, obj, filename):
         base = os.path.dirname(filename)
         if not os.path.exists(base):
             os.makedirs(base)
 
-        # TODO : remove return
-        #return
-
-        with open(filename + '.tmp', 'wb+') as f, gzip.open(filename, 'w') as fzip:
+        with open(filename + '.tmp', 'wb+') as f, self._openDB(filename, 'w') as fzip:
             pickle.dump(obj, f)
             f.seek(0)
             fzip.write(f.read())
@@ -253,7 +256,7 @@ class IWLA(object):
         if not os.path.exists(filename):
             return None
 
-        with gzip.open(filename, 'r') as f:
+        with self._openDB(filename) as f:
             return pickle.load(f)
         return None
 
@@ -805,6 +808,10 @@ if __name__ == '__main__':
                         default=False,
                         help='Reset analysis to a specific date (month/year)')
 
+    parser.add_argument('-z', '--dont-compress', dest='dont_compress', action='store_true',
+                        default=False,
+                        help='Don\'t compress databases (bigger but faster)')
+
     args = parser.parse_args()
 
     # Load user conf