The stock setting are perfect already. I dont see much of an improvement when overclocking anyways. Its only noticeable once you hit over 1.3 MHz but you will drain battery more quickly since it will require more voltage to run efficiently. You will also run into heat issues which in turn drain battery more quickly. Underclocking in the other hand is different. All you are doing is saving more battery while sacrificing some performance.OverClock/Underclock settings for nest performance?