by Ken Task.
So the 'slave replication' is to be on the same server? or will the 'slave' be on another physical machine (different IP address)?
Install MySQLTuner and run it. You might see DB in need of tweaking ... memory usage.
But, as long as the auto's consume more memory that depletes memory needed for apache ... regardless of how you have configured apache, on same box (same CPU's etc.) think you might not end up where you'd like to be.
But ... Alain should be jumping back in.
'SoS', Ken