Last September I wrote an article about a custom function that I optimized to evaluate hundreds times faster. At the end of the article, I challenged my readers and myself by claiming that the already optimized custom function can be optimized even further. Do you remember?
Later on I actually really optimized it again, and talked about this optimization during my session at Pause On Error [x] London 2011. Now you can watch the video of this part of my session below: