With a server with 30GB of RAM How many users can I handle simultaneously

At that scale your server will be ample and over provisioned. A 4GB instance at Digital Ocean would probably be enough.

There are tons of metrics that define load, it is very hard to estimate:

  • Number of concurrent sessions
  • Total number of posts in forum
  • Anon vs Logged in breakdown (anon is WAY cheaper)
  • Number of uniquely secured categories

And so on…

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