Simon, what makes you think it's only a few in numbers that are having this stuttering?
I've always had it, would be fun to see someone having no stutter at all. For me, it's obvious. I'm kinda "used" to it, but it's far from ideal.
I think I've tried this on three different PC's now, and it's stuttering in each of them. It's a while though, so I will need to retest to make sure.
Maybe those people that have no stutter at all could measure it and post the results here with their system specs?