on battery: reduced on AC: automatic just wondering what everyone runs their processors at? i used to run mine at reduced on battery and highest on AC, but just within the past few weeks, i asked myself "why do i need my processor running at highest, when i'm not really doing anything that is processor intensive anyway?" so i changed it to automatic on AC. my powerbook runs a LOT cooler. i only switch to highest if i need to encode mp3s or video. other than, automatic is GREAT for my web surfing, emailing, and IM's.