Actually, the point is that being faster is better. Ideally, a message sent to an Actor is never stored in persistent memory. A runtime system should never acc

Actually, the point is that being faster is better. Ideally, a message sent to an Actor is never stored in persistent memory. A runtime system should never accept a unbounded backlog of communications for an Actor. Instead worst case, it should generate exceptions for further requests. Here are references that you requested: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3418003 https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3418003 https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3459566 https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3459566