diff --git a/OBIA/segmentation.py b/OBIA/segmentation.py
index e08c9e4cb8be391085576e0dfa1c273c9ea3c693..78973fdd84356874f5ac4986d05db4f5fbac8690 100644
--- a/OBIA/segmentation.py
+++ b/OBIA/segmentation.py
@@ -244,11 +244,11 @@ def lsgrm(input_image, params : LSGRMParams, out_seg, n_proc=None, memory=None,
     else:
         raise ValueError('Output type {} not recognized/supported.'.format(ext))
 
-    # Define default number of threads (half) and memory amount (3/4 of available)
+    # Define default number of threads (half) and memory amount (1/2 of available)
     if n_proc is None:
         n_proc = round(mp.cpu_count() / 2)
     if memory is None:
-        memory = round(psutil.virtual_memory().available * 0.75)
+        memory = round(psutil.virtual_memory().available * 0.5)
     else:
         memory *= 1e6