This may have been brought up in the past and I haven't checked yet, but
fyi anyways: flattening hash_queue_depth to 1 *vastly* improved Postfix
performance on a slow [66mhz] machine by reducing the amount of disk
activity it was doing every time a message came in, or I looked at the
queue, or any other operation you'd think would be fast. Not that many
messages come through this little corner of the net and there aren't ever
more than like 10 items in all the queues combined, so I certainly don't
need any more than 16 different queue subdirectories. It was apparently
taking the machine a lot longer to scan through all 256 of those original
subdirs than to just pick one and dump a message into it.

Doing this might help quite a bit on larger, faster, more high-mail-volume
machines as well. Flattening is as easy as halting everything, dropping
hash_queue_depth = 1 in main.cf, and letting postsuper run amok. Turn
on -v for more entertainment value.

_H*
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