Hi all,
Dunno if everyone's on this already but looks useful: http://martinezjavier.wordpress.com/2013/04/27/mmap-support-for-raspberry-pi...
From here:
http://www.raspberrypi.org/phpBB3/viewtopic.php?f=38&t=33462&p=33494...
Not tested as of yet but anything that squeezes a bit more audio performance out of the RPi is to be welcomed.
rpi-update ahoy,
Julian