Indeed, 6% speed-up is not something to write home about....
I still suspect you're using filters that slow things down. Things like TemporalSmoother and DeInterlacing usually negate the effect of Fast Recompress on my encodes. And as we all know the MPEG features slow everyone's encoding down too, so I wouldn't be surprised at all that if you used GMC, B-frames, and DeInterlacing you'd lose your speed benefit completely.
I still recommend staying with Fast Recompress, because the fewer colorspace conversions the better, even if it doesn't speed things up for you.
Besides, if you want a real speed-up, buy a faster computer! Mine should be delivered within the next few days, and it will be smoking fast when I put it together!
