diff --git a/src/wrapper.c b/src/wrapper.c
index 7ef79ae7e898f728d8b31701f4953b9c47de3649..58f8ffffc003820a90a6c7e323bcf31864ba8976 100644
--- a/src/wrapper.c
+++ b/src/wrapper.c
@@ -54,6 +54,7 @@ PyMODINIT_FUNC PyInit_wrapper(void)
 {
   PyObject *m;
 
+  clocks_set_cpufreq(0);
   import_array();
   Py_Initialize();
   m = PyModule_Create(&wrapper_cmodule);
diff --git a/test/test_cooling.py b/test/test_cooling.py
index e2a8c6f392aa39af17e9ead3be6f5f122730385f..43148ce9a7e875bf9a747afc8e7847d605a3c845 100644
--- a/test/test_cooling.py
+++ b/test/test_cooling.py
@@ -19,8 +19,8 @@ gamma = 5. / 3.
 filename = "test/cooling.yml"
 
 # number of points
-N_rho = 3000
-N_T = 3000
+N_rho = 300
+N_T = 300
 
 # density in atom / cm3
 if N_rho == 1: