Disk too Slow or system overload


Hi there Folks,

I have a really annoying situation with Logic going into spinning ball mode for what I can see as no apparent reason. I have 22gb Ram , a xeon quad core and plenty of free space on both my boot drive and my samples/libs drive.
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I seems really odd that this should happen as I my CPU monitor tells me that I'm at 83% idle. I'm wondering if it could be because I think that some of my sample libs are on my boot drive and some are on my audio libs drive. Both are SSDs so run pretty speedily. Any thoughts would be HUGELY appreciated as I'm on a deadline at the mo and really don't need this to be happening. Occasionally it seems that on the logic CPU graphic that i do get a spike in one of the cores which can glitch it out although I haven't notice this happening recently. thats in advance