eja: add another performance TODO.

diff --git a/mjo/eja/TODO b/mjo/eja/TODO
index 5bb85879e781286ca67df0a37a856c7db0a7885d..6223bff9331ba3144cbfdd8fbdd8fe616139a230 100644 (file)
--- a/mjo/eja/TODO
+++ b/mjo/eja/TODO
@@ -9,3 +9,7 @@
 
 4. Can we hit "x" with the deortho matrix and delegate to the
    _rational_algebra to speed up minimal_polynomial?
+
+5. In CartesianProductEJA we already know the multiplication table and
+   inner product matrix. Refactor things until it's no longer
+   necessary to duplicate that work.