Im using res 3.1.1 on pc and here are some of my issues.
I will post my PC spec at the end.
Im running vista and XP (I know Vista is a big no no and slow)
ive encoded all clips 400x300 DXV
I can happily play 2 layers at 60fps but as soon as i try to change decks it stutters down to 15fps even 12fps.
so this rules out any live performance at this moment in time.
My xp machine is similar and i have the same problem. it is xp home and not pro so i feel this will probs be my down fall also.
overall i think the program is fantastic and the potential is just waiting to fully suffice.
from what i have read. win 7 is a must and also a ssd drive.
luckily im due an upgrade in the next few months for my new AV project that will get under way!
your doing a great job guys keep it up!

Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz
2gb Ram
ATI X1700 mobility
7200rpm hdd.
playback ext 7200rpm hdd.
Thanks
Basic