diff --git a/python/dune/codegen/pdelab/driver/timings.py b/python/dune/codegen/pdelab/driver/timings.py
index 4a3d265fefd460bbee0218630bc40d0bc57a22b9..aeca64d46c73f2327b48c22f07dca7a85a044104 100644
--- a/python/dune/codegen/pdelab/driver/timings.py
+++ b/python/dune/codegen/pdelab/driver/timings.py
@@ -133,6 +133,9 @@ def setup_timer():
         include_file("likwid.h", filetag="driver")
         init_likwid()
         if get_option('instrumentation_level') >= 3:
+            import logging
+            logger = logging.getLogger(__name__)
+            logger.warning("timings: using instrumentation level >= 3 with likwid will slow down your code considerably")
             local_operator_likwid()
         finalize_likwid()
     else: