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Openfire not able to handle big roster group(100k users) which shares the contact to it's user

HI,
I am trying to share group with 100k users with itself and with another group which also has 100k users. but it seems like Openfire is not able to handle so this. I am experiencing above situation specifically with the Openfire 4.2.0 and higher. any help is appreciated. thanks in advance.