diff --git a/ImageD11/nbGui/TDXRD/3_3DXRD_look_at_peaks.ipynb b/ImageD11/nbGui/TDXRD/3_3DXRD_look_at_peaks.ipynb
index 678f4f45..b8d06dfa 100755
--- a/ImageD11/nbGui/TDXRD/3_3DXRD_look_at_peaks.ipynb
+++ b/ImageD11/nbGui/TDXRD/3_3DXRD_look_at_peaks.ipynb
@@ -17,6 +17,12 @@
    },
    "outputs": [],
    "source": [
+    "import os\n",
+    "\n",
+    "os.environ['OMP_NUM_THREADS'] = '1'\n",
+    "os.environ['OPENBLAS_NUM_THREADS'] = '1'\n",
+    "os.environ['MKL_NUM_THREADS'] = '1'\n",
+    "\n",
     "exec(open('/data/id11/nanoscope/install_ImageD11_from_git.py').read())\n",
     "PYTHONPATH = setup_ImageD11_from_git( ) # ( os.path.join( os.environ['HOME'],'Code'), 'ImageD11_git' )"
    ]