Press the space key to render. It renders very fast!
This project blurs any image, based on a number of samples, and very smoothly; it works very well for high a blur radius, which many projects can't pull off, is unbiased towards directions, and has a very cool look. Higher samples means a smoother blur, but scratch rounds transparency values, so you will get more color rounding. Lower samples means less color rounding and a faster speed, but can give a cheaper blur effect.