With Long Animation Frames (commonly referred to as LoAF, pronounced 'LO-aff') we finally have a way to understand the impact of our code on our visitors' experiences. Long Animation Frame – a frame that took longer then 50ms from its start to when it started painting LoAF allows us to understand how scripts and other tasks affect both hard and soft navigations, as well as how scripts affect interactions. Using the data LoAF provides, we can identify problem scripts and target changes that ...