diff --git a/tests/test_perf.py b/tests/test_perf.py
index 4153e6d..48b46d6 100644
--- a/tests/test_perf.py
+++ b/tests/test_perf.py
@@ -27,10 +27,10 @@ def inner():
     benchmark(inner)
 
 
-def test_calc_mae_1e9(benchmark):
+def test_calc_mae_1e7(benchmark):
     def inner():
-        obs = np.random.rand(int(1e9))
-        fct = np.random.rand(int(1e9))
+        obs = np.random.rand(int(1e7))
+        fct = np.random.rand(int(1e7))
         calc_mae(obs, fct)
 
     benchmark(inner)
@@ -54,10 +54,10 @@ def inner():
     benchmark(inner)
 
 
-def test_calc_mbe_1e9(benchmark):
+def test_calc_mbe_1e7(benchmark):
     def inner():
-        obs = np.random.rand(int(1e9))
-        fct = np.random.rand(int(1e9))
+        obs = np.random.rand(int(1e7))
+        fct = np.random.rand(int(1e7))
         calc_mbe(obs, fct)
 
     benchmark(inner)
@@ -81,10 +81,10 @@ def inner():
     benchmark(inner)
 
 
-def test_calc_threshold_hit_ratio_1e9(benchmark):
+def test_calc_threshold_hit_ratio_1e7(benchmark):
     def inner():
-        obs = np.random.rand(int(1e9))
-        fct = np.random.rand(int(1e9))
+        obs = np.random.rand(int(1e7))
+        fct = np.random.rand(int(1e7))
         calc_threshold_hit_ratio(obs, fct, 0.5)
 
     benchmark(inner)
@@ -108,10 +108,10 @@ def inner():
     benchmark(inner)
 
 
-def test_calc_threshold_false_alarm_ratio_1e9(benchmark):
+def test_calc_threshold_false_alarm_ratio_1e7(benchmark):
     def inner():
-        obs = np.random.rand(int(1e9))
-        fct = np.random.rand(int(1e9))
+        obs = np.random.rand(int(1e7))
+        fct = np.random.rand(int(1e7))
         calc_threshold_false_alarm_ratio(obs, fct, 0.5)
 
     benchmark(inner)
@@ -135,10 +135,10 @@ def inner():
     benchmark(inner)
 
 
-def test_calc_threshold_ts_1e9(benchmark):
+def test_calc_threshold_ts_1e7(benchmark):
     def inner():
-        obs = np.random.rand(int(1e9))
-        fct = np.random.rand(int(1e9))
+        obs = np.random.rand(int(1e7))
+        fct = np.random.rand(int(1e7))
         calc_threshold_ts(obs, fct, 0.5)
 
     benchmark(inner)