Hmmm, I think it's computer speed. I use notebook with just a single core 1.7 GHz Pentium M. What's interesting is that for me page scrolling speed isn't sprea

Hmmm, I think it's computer speed. I use notebook with just a single core 1.7 GHz Pentium M. What's interesting is that for me page scrolling speed isn't spread over many values for different sites. It's either fast (majority of sites) or very slow (some sites). That's why I didn't suspect computer speed. It did look more like rendering engine bug / inefficient code path for particular layout/image/CSS combinations. It seems like some designs trigger heavy computation, which is not noticeable on faster systems, but is very painful on slower machines.