I use a 2 turn Seaguar Knot with excellent results http://www.netknots.com/html/seaguar_knot.html

It is blinding fast and strong. I make a bigger loop, hold the loop with my left hand, twist the loop with my right hand index finger. Then I slip my right hands index ,middle and thumb through the loop and catch the the tag end and leader and pull them through loop
it is a 1 & 1/2 second knot.