I have the same issue with the scroll and have mentioned it to Jeff.
I think the Save takes longer mainly because RB also makes a backup of the previous version, and THEN writes the new SEQ file, which a lot of DAWs don't do (at least in the way RB does).
So that may explain the longer save time anyway.
I do like a lot of the suggestions you've made above Pipeline, FWIW


Make your sound your own!
.. I do not work here, but the benefits are still awesome