How does openfire server behave when one recipient got packet from multiple sender at the same time?

I am newbie in xmpp(openfire server). I trying to make a application where multiple user can write or sketch at the same time on their client application and the coordinates will be passed to all the active group members. so in that case there is a very possible case when one user have to receive many coordinates from different user at the same time. How this will be handled by server? will only one packet be passed at one time? and other packet will be dropped? if so, what kind of mechanism should be used? Thanks in advance for the help.