Multicast message delayed

I used mod_multicast for my project, it work well, but when lots of people sending multicast messages, it will delivered very slow one by one, so the last message will be delay for very long time
I sent about 500 multicast message (each have about 5->10 receivers) the last message will be delayed for more than 30 mins
Anyone have experiences in this problem? if yes, please help me for this
Thanks

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