Bill Moran <wmoran(at)potentialtech(dot)com> writes:
> Was this true for some previous version? I could have swore I read somewhere
> that vacuum_mem had to be set high enough or vacuum wouldn't be able to clean
> everything up (aside from anything locked in transactions).
Nope, never been the case.
> Is performance the only reason for increasing vacuum_mem?
Yes.
regards, tom lane