LimeWire 2.7.3 a CPU hog??

I usually run LimeWire on a computer with a 700MHz cpu. Up until I upgraded to 2.7.3 (from 2.6.5, I think) I've noticed that LimeWire gets REALLY bogged down CPU wise. Spikes, sure, but then periods of 5+ seconds of LimeWire being frozen, clicks do nothing, CPU at 100% and then LimeWire "catches up" and CPU goes down to normal (1-5%).

Anybody else see this?? Is this normal? I wouldn't have thought 700MHz was "too slow" to run an app like this.. but I dunno!