[Mimedefang] using a RAM disk for mimedefang temp directory?

[Matthew Ward]

we've been using mimedefang+spamassassin under sendmail for quite some
time now, very successfully.

looking around for ways to speed things up and/or just make them more
efficient ... wondering if anyone has experience using a RAM disk
(tmpfs as opposed to an expen$ive solid state disk) for mimedefang's
temporary directory?

am i right in assuming that the "temporary directory" is what
configure calls "spooldir" and not the "quarantinedir"?  or is there a
separate "temp dir"?