I wish the best, but still rocks:

> If deployed on a 16 GB RAM machine with at least 4 cores, a single ejabberd node can typically handle 200-300 K online users.

From: docs.ejabberd.im/get-started/

My 17 years old server is on 8GiB RAM with four 1.2GHz cores. I don't notice it. User data takes up 200MiB of space (it massively increased recently for some reason). Unlike Synapse :)

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