[Mailman-Users] Very bad performance (newbie)

[Damian Coutts]

Mailman Users
I have installed mailman on my Redhat Linux 8.0 machine.
I am not sure if it is working because when I start it (mailmanctl 
start) the machine suffers a terrible performance degredation. ie. its 
response becomes so slow that it  is hard to do anything.
I did manage to determine that the CPU utilisation does not seem to be 
very high
Can anyone help me?
Damian Coutts