Send one message vs send many messages performance

In JBM sometimes we need to cast a batch of messages across the group, 
e.g. on transaction commit when multiple messages have been sent in a 
transaction.

I can either do this by casting a different jgroups message for each jms 
message, or by casting a single jgroups message containing a list of the 
jms messages.

Can you think of any pros/cons of either approach. I'm thinking in terms 
of performance, overhead of a single jgroups message, message 
frag/defrag overhead etc?

TIA

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