I don&#x27;t know of a good threshold, but you should generally favor small messages -&gt; big computations.  If a 1mb message isn&#x27;t handled properly, it could be retransmitted, etc.  In the case of a 1mb message, it sounds like that data should be serialized into a database and the id or whatever is needed to access it is passed along in the message instead.<p>It&#x27;s like emailing a 10mb powerpoint instead of throwing it on Dropbox and sending a link to it.