diff --git a/tests/test_perf.py b/tests/test_perf.py
index 48b46d6..c09c647 100644
--- a/tests/test_perf.py
+++ b/tests/test_perf.py
@@ -10,135 +10,150 @@
 
 
 def test_calc_mae_1e3(benchmark):
+    obs = np.random.rand(int(1e3))
+    fct = np.random.rand(int(1e3))
+
     def inner():
-        obs = np.random.rand(int(1e3))
-        fct = np.random.rand(int(1e3))
         calc_mae(obs, fct)
 
     benchmark(inner)
 
 
 def test_calc_mae_1e6(benchmark):
+    obs = np.random.rand(int(1e6))
+    fct = np.random.rand(int(1e6))
+
     def inner():
-        obs = np.random.rand(int(1e6))
-        fct = np.random.rand(int(1e6))
         calc_mae(obs, fct)
 
     benchmark(inner)
 
 
 def test_calc_mae_1e7(benchmark):
+    obs = np.random.rand(int(1e7))
+    fct = np.random.rand(int(1e7))
+
     def inner():
-        obs = np.random.rand(int(1e7))
-        fct = np.random.rand(int(1e7))
         calc_mae(obs, fct)
 
     benchmark(inner)
 
 
 def test_calc_mbe_1e3(benchmark):
+    obs = np.random.rand(int(1e3))
+    fct = np.random.rand(int(1e3))
+
     def inner():
-        obs = np.random.rand(int(1e3))
-        fct = np.random.rand(int(1e3))
         calc_mbe(obs, fct)
 
     benchmark(inner)
 
 
 def test_calc_mbe_1e6(benchmark):
+    obs = np.random.rand(int(1e6))
+    fct = np.random.rand(int(1e6))
+
     def inner():
-        obs = np.random.rand(int(1e6))
-        fct = np.random.rand(int(1e6))
         calc_mbe(obs, fct)
 
     benchmark(inner)
 
 
 def test_calc_mbe_1e7(benchmark):
+    obs = np.random.rand(int(1e7))
+    fct = np.random.rand(int(1e7))
+
     def inner():
-        obs = np.random.rand(int(1e7))
-        fct = np.random.rand(int(1e7))
         calc_mbe(obs, fct)
 
     benchmark(inner)
 
 
 def test_calc_threshold_hit_ratio_1e3(benchmark):
+    obs = np.random.rand(int(1e3))
+    fct = np.random.rand(int(1e3))
+
     def inner():
-        obs = np.random.rand(int(1e3))
-        fct = np.random.rand(int(1e3))
         calc_threshold_hit_ratio(obs, fct, 0.5)
 
     benchmark(inner)
 
 
 def test_calc_threshold_hit_ratio_1e6(benchmark):
+    obs = np.random.rand(int(1e6))
+    fct = np.random.rand(int(1e6))
+
     def inner():
-        obs = np.random.rand(int(1e6))
-        fct = np.random.rand(int(1e6))
         calc_threshold_hit_ratio(obs, fct, 0.5)
 
     benchmark(inner)
 
 
 def test_calc_threshold_hit_ratio_1e7(benchmark):
+    obs = np.random.rand(int(1e7))
+    fct = np.random.rand(int(1e7))
+
     def inner():
-        obs = np.random.rand(int(1e7))
-        fct = np.random.rand(int(1e7))
         calc_threshold_hit_ratio(obs, fct, 0.5)
 
     benchmark(inner)
 
 
 def test_calc_threshold_false_alarm_ratio_1e3(benchmark):
+    obs = np.random.rand(int(1e3))
+    fct = np.random.rand(int(1e3))
+
     def inner():
-        obs = np.random.rand(int(1e3))
-        fct = np.random.rand(int(1e3))
         calc_threshold_false_alarm_ratio(obs, fct, 0.5)
 
     benchmark(inner)
 
 
 def test_calc_threshold_false_alarm_ratio_1e6(benchmark):
+    obs = np.random.rand(int(1e6))
+    fct = np.random.rand(int(1e6))
+
     def inner():
-        obs = np.random.rand(int(1e6))
-        fct = np.random.rand(int(1e6))
         calc_threshold_false_alarm_ratio(obs, fct, 0.5)
 
     benchmark(inner)
 
 
 def test_calc_threshold_false_alarm_ratio_1e7(benchmark):
+    obs = np.random.rand(int(1e7))
+    fct = np.random.rand(int(1e7))
+
     def inner():
-        obs = np.random.rand(int(1e7))
-        fct = np.random.rand(int(1e7))
         calc_threshold_false_alarm_ratio(obs, fct, 0.5)
 
     benchmark(inner)
 
 
 def test_calc_threshold_ts_1e3(benchmark):
+    obs = np.random.rand(int(1e3))
+    fct = np.random.rand(int(1e3))
+
     def inner():
-        obs = np.random.rand(int(1e3))
-        fct = np.random.rand(int(1e3))
         calc_threshold_ts(obs, fct, 0.5)
 
     benchmark(inner)
 
 
 def test_calc_threshold_ts_1e6(benchmark):
+    obs = np.random.rand(int(1e6))
+    fct = np.random.rand(int(1e6))
+
     def inner():
-        obs = np.random.rand(int(1e6))
-        fct = np.random.rand(int(1e6))
         calc_threshold_ts(obs, fct, 0.5)
 
     benchmark(inner)
 
 
 def test_calc_threshold_ts_1e7(benchmark):
+    obs = np.random.rand(int(1e7))
+    fct = np.random.rand(int(1e7))
+
     def inner():
-        obs = np.random.rand(int(1e7))
-        fct = np.random.rand(int(1e7))
         calc_threshold_ts(obs, fct, 0.5)
 
     benchmark(inner)