What's new in 6.0rc2 (2012-Oct-24 11:27):

*) added generic fast path support on certain interfaces
   (all ethernets on RB3xx, RB6xx, RB7xx, RB8xx, RB9xx, RB1000, RB11xx, RB2011);
*) added ipv4 fast path, it doubles ipv4 forwarding performance
   on supported interfaces when no firewall, conntrack, queues.
*) added traffic generator fast path;
*) addedbridge fast path;
   More info on fast path: http://wiki.mikrotik.com/wiki/Manual:Fast_Path