Spark freeze with long contact list

I’m testing the spark with openfire to replace our current messenger (self-developed). We have a long list of contacts (about 6k) and many groups. I imported all contacts and groups to openfire, configured the share and tried to connect with the spark.

But the spark freeze all times i had tried.

Any option to fix it?

I hope you’re not publishing all contacts to all users. That would kill both the client and the server.

That’s it i’m doing, that’s it i need to do.

Is possible to send only the online users? On our current messenger we had max 950 users connected