diff --git a/tests/test_sdk.py b/tests/test_sdk.py
index f8bd74ca..220883f3 100644
--- a/tests/test_sdk.py
+++ b/tests/test_sdk.py
@@ -135,7 +135,7 @@ def test_parse_dates_with_datetime(self):
         self.assertIsInstance(parsed_end, datetime)
         self.assertEqual(parsed_end.tzinfo, UTC)
 
-    @mock.patch("watttime.requests.Session.post", side_effect=mocked_register)
+    @mock.patch("requests.post", side_effect=mocked_register)
     def test_mock_register(self, mock_post):
         resp = self.base.register(email=os.getenv("WATTTIME_EMAIL"))
         self.assertEqual(len(mock_post.call_args_list), 1)
diff --git a/watttime/api.py b/watttime/api.py
index b70da778..cc8207e2 100644
--- a/watttime/api.py
+++ b/watttime/api.py
@@ -258,7 +258,7 @@ def _fetch_data(
 
         responses = []
         if self.multithreaded:
-            with ThreadPoolExecutor(max_workers=os.cpu_count() * 5) as executor:
+            with ThreadPoolExecutor(max_workers=10) as executor:
                 futures = {
                     executor.submit(
                         self._make_rate_limited_request, url, params