Latency and the M-Audio mobilpre USB

I know its like an overworked subject but I have searched and gotten no real answer.
small but realy annoying amount of latency makes doing overdubs and such a real confusing thing. (aka-beotch).
playback always lagging just a little behind new input(mic or instr).
I have an M-Audio mobilpre USB and am having unacceptable latency probs.
everything as suggested has been done.
GB-Mobilepre-up to latest rev-driver etc...
last try was all monitors off-only 1 track-optimized buffer for speed.
I have a 1.2gig pros-1.62gig ram on a g4.
could it be that its just the fact of USB as opposed to firewire?
any guesses?
thanx
cheers,
matt
g4-1.2gig proc-lots of HD and mem Mac OS X (10.3.8)
g4-1.2gig proc-lots of HD and mem Mac OS X (10.3.8)

"be you USB or be you fire wire"
I am using a simple setup:
Small unpowered mixer connected to my iBook via iMic. (USB 2 connection)
For MIDI: I have a Keystation 49e (direct USB) and a Yamaha PSR 520 connected via MIDIMAN usb 1x1.
I do not plug my headphones into the iMic because the latency was noticeable. I only use the iMic for input. I plug the headphones into my headphone jack and turn on monitoring in each track I am recording live. The latency is barely, barely noticeable.
You have an even better option via zero latency monitoring. If you can't get past the latency then you will have to monitor using the Mobile Pre. See your manual for details.
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In a recent session a bass guitarist noticed annoying latency. I realized I had a cpu intensive plugin enabled. Turning the effect off removed the latency problem.
While running Garageband make sure no other tasks are running, such as indexing. File vault is also a performance killer and I finally turned it off.
More suggestions here:
GarageBand 2 Help: Optimizing GarageBand performance
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