Forgotten file added

performance/context_managers.py

@@ -0,0 +1,13 @@
+import time
+
+from contextlib import contextmanager
+
+
+@contextmanager
+def time_to_logger(logger, msg):
+    t0 = time.time()
+    try:
+        yield
+    finally:
+        took = (time.time() - t0) * 1000
+        logger.info(f"{took:6.2f}ms {msg}")