I don't want to start a new thread if there's already one on scrolling.
I'm using sp10 now, just upgraded from sp9, but I'm using the Kensington Expert Mouse Pro trackball, and it seems that the scrolling behavior has changed with the 5.5 builds from the 5.1.3 one.
Scrolling is no longer smooth when using the scroll wheel (and maybe a little so when using the scroll bar as usual). Is this something I should test with another mouse (which I don't have readily available), or does WebKit just scroll differently than WebCore used to? The scrolling with the scroll wheel is now very jumpy (not jittery).... simply not smooth. It also scrolls more than I would expect with each scroll down. Instead of smoothly scrolling, it jumps a few inches each time.
If no one else is experiencing this, I'll chalk it up to the Kensington driver.