Update (23rd October 2014) - Now with video link HERE.
Swift optimisation presentation refined and developed further.
Please contact me if you want the source version and please let me know if you make use of it or find it useful.
Description of the demo from a previous event. Note that for Xcode 6.1 you will need to use the 0x, 1x, 2x and fullSpeedXC61 branches instead of the 0, 1, 2 and fullSpeed branches respectively. Likewise master currently has an Xcode 6.1 version although I will probably merge that to the real master shortly.