Currently when opening editors for various portal components they will retrieve the metadata for entities/fields/etc to populate drop downs. For example when you open an Entity Form the list of available entities is retrieved regardless of whether you are creating a new record or editing an existing one. This load causes the editors to effectively freeze up making the unresponsive. The usage pattern for this lookups really only requires that they are populated on demand or at the very least only on create, this change would make the editors much much more responsive while reduce platform load from unnecessary requests.