I have 403 skins in my HTC AHII skins file & I get these stutters every once in a while. I did not however have wav in selected, I checked it & will see if that helps my stutters as well.
System specs: Athlon64 4000+ OC'd to 2.9GHZ - 2GHZ DDR Ram - Asus A8N SLI Premium mobo - 1GHZ eVGA 7950 GX2 - Antec 550watt trupower II