[Freeswitch-users] conference high cpu and audio delay

Hello, I'm running FreeSWITCH Version 1.0.7 (hacked-20110606T040042Z) on Ubuntu 10.04 64 bit with kernel 2.6.35-22-server. I am running about 300 simultaneous calls spread out over about 50 conferences. I'm getting a cpu load of 20 to 30, and cpu utilization about 75% on each core. There's about a 2 second audio delay in the conference when it gets this loaded. Is this high load and audio delay just the limit of my cpu (dual core E5200)? I ask because I was able to get the same number of calls on this server with asterisk 1.6 with app_konference with a much lower cpu load - about 4 or 5 - and no audio delay. Thanks, Cameron