diff --git a/TODO b/TODO
index 015987f..fd723a8 100644
--- a/TODO
+++ b/TODO
@@ -1,3 +1,7 @@
  - ui_relay.ml: deal with Message.Subscribe and .Unsubscribe as well as .Post in api_tap_sink
  - web: add cache control information to served responses
  - use lazy and Lazy.force where appropriate
+
+ - Figure out how to avoid the overhead of Message.message_of_sexp
+    - straight matching of sexps without translation gives a ~5% speedup
+    - checking for "post" first in message_of_sexp gives a ~3% speedup