Large messages to groups of receivers

Hi,

when sending large messages (say, 4GB) from a server to a group of
receivers (say, 1000 of them) where each of them have their own queue on
the server side, will the server side broker queues "refer" to the same
payload (in memory/on disk), or will the payload get duplicated on each
queue?

Best regards,
Tor Rune Skoglund, trs [ at ] swi.no