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Nice, it still shakes a lot but the perspective distortion seems to be a lot better. To make it perfect I guess you have to do something about pass 1 too. It can only take panning, rotation and zoom into account today, so it will get confused by perspectives.
The smoothing process is described in the post that warp linked to above. The equation systems take longer time to solve when the smoothness is high, because each frame will then have a bigger impact on frames far away in the past or future. And since the equation systems are solved numerically, it takes a while for these low frequency changes to propagate over the equations, so to speak. Also, if you use max. correction limits, they can be very time consuming.
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