Is there an app that will automaticaly put my tf300t into performance mode when I plug it in and switch to balanced or power saver mode when on battery?
Off the top of my head I would have to say no. Not automatically. Don't know how much demand there would be for it anyway as out of all the tablets out there only the TF201, TF300 and TF700 even have that featured and, for me at least, it's pretty quick and simple.
Thanks, its pretty easy and fast to change and normally I use the balanced mode, but every now and then I put it in performance mode, then I forget to change it back when I unplug it, performance mode will eat a battery.