Synapse, after a reboot and the cache is cold, uses less than that. I don't think our synapse server even has 8GB allocated to it.
But that's for private chat, we can't join large rooms because I deployed our server as a test, alongside Mattermost and rocket.chat. I haven't felt compelled to switch to dendrite or whatever, nor split the synapse microservices out, nor install postgres on a dedicated VM, and so on. All of which would make someone else's matrix experience better but my life ^ that much worse.
But that's for private chat, we can't join large rooms because I deployed our server as a test, alongside Mattermost and rocket.chat. I haven't felt compelled to switch to dendrite or whatever, nor split the synapse microservices out, nor install postgres on a dedicated VM, and so on. All of which would make someone else's matrix experience better but my life ^ that much worse.