Hi everyone, This isn't the first time that this question came to my mind, cause I found that kinda weird! I'm using lion 10.7.2 and everytime I plug off the charger, my mac just runs faster! I'm using MBA mid 2009, and time just slow it down so much. Most of my relate works is surfing web, iTunes, watching HD movies. I just made up my mind that I would definitely buy next MBA in mid (or late) 2012, so the battery cycle is not a big deal anymore. But I just don't understand why my MBA just run faster when the power source is merely battery.