Synapse is very lightweight now. I recommend using it because it gets the latest features as they are released, like VOIP calls instead of crappy Jitsi, etc.

Synapse is very lightweight now. I recommend using it because it gets the latest features as they are released, like VOIP calls instead of crappy Jitsi, etc. Matrix is still heavily under development, so you want to be using the reference/most active implementation of the protocol. You can stop federation too.