iTunes 9 Question

For those of you using iTunes 9 on a PC: Have you noticed any increased stuttering during playback of music files? I’m trying to determine if the problem lies with Quicktime, iTunes, or interference from the virus scanner. This is a much lighter stuttering than I get due to process load, and is distinctly not a bad rip stutter.

ETA (9/20/09): Hmm, after adjusting Quicktime parameters and rebooting, the problem appears to be gone.