--- a/Notes.md	Wed Mar 17 10:20:05 2021 +0100
+++ b/Notes.md	Fri Mar 19 16:52:53 2021 +0100
@@ -312,3 +312,12 @@
 contribute to "type bloat". On the other hand adapting existing types to
 handle embeddedness would complicate the now very simple grid types. Are there
 other ways of doing the implentation?
+
+## Performance measuring
+We should be measuring performance early. How does our effective cpu and memory bandwidth utilization compare to peak performance?
+
+We should make these test simple to run for any solver.
+
+See [this talk](https://www.youtube.com/watch?v=vPsfZUqI4_0) for some simple ideas for defining effecive memory usage and some comparison with peak performance.
+
+