Investigate where we can avoid switching from field items to pseudo entities so often

Every field hook is creating and destroying pseudo-entities for all the multifield field values. I'd like to investigate if it's possible to avoid some of that switching back and forth, especially from entity submit/presave through insert/update hooks. I believe I had looked into at one point adding the pseudo entities inside multifield_field_load() for caching, but there were some issues related to that. Maybe needs to be looked at again.