You can optimise for speed, power consumption or memory use & tiny changes can have a negligible or huge impact, but what should you optimise and most importantly, when? Dr Steve Bagley has an example! https://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com/ Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com/