diff --git a/proseco/tests/timing.py b/proseco/tests/timing.py
new file mode 100644
index 00000000..59fdcf54
--- /dev/null
+++ b/proseco/tests/timing.py
@@ -0,0 +1,39 @@
+# Licensed under a 3-clause BSD style license - see LICENSE.rst
+
+"""
+Provide a function to check for timing regressions for any changes.
+"""
+
+import time
+import sys
+
+import numpy as np
+
+from proseco import get_aca_catalog
+from proseco.tests.test_common import mod_std_info
+
+
+def time_get_aca_catalog(n_samples=100):
+    """
+    Get n_samples catalogs for standard parameters (all at the same 2018:001) date.
+    """
+
+    np.random.seed(0)
+
+    ras = np.random.uniform(0, 360, size=n_samples)
+    decs = np.random.uniform(-90, 90, size=n_samples)
+    rolls = np.random.uniform(0, 360, size=n_samples)
+
+    # Get rid of initial imports or one-time startup stuff (e.g. in AGASC)
+    get_aca_catalog(**mod_std_info())
+
+    t0 = time.time()
+    for ra, dec, roll in zip(ras, decs, rolls):
+        print('.', end='')
+        sys.stdout.flush()
+        get_aca_catalog(**mod_std_info(att=(ra, dec, roll)))
+
+    t1 = time.time()
+    print()
+
+    print(f'Got {n_samples} catalogs in {(t1 - t0) / n_samples:.3f} secs (mean)')