MichaelDBA <MichaelDBA@xxxxxxxxxxx> writes: > I don't have a problem with hundreds or thousands of logins per minute > on RDS or bare metal, even with only 8 CPUs and 32GB RAM. There is > something else in play here... Yeah. The OP didn't mention the authentication method in use, but I could believe some sort of performance glitch if it consults an external server (for Kerberos, AD, LDAP, etc). Or maybe it's basically a network problem between client and server. regards, tom lane