I have been using DP4 for a while and have used all the DPs from the very beginning. I should say that scrolling has not been that good since the very beginning. For every Apple application that incorporates a new ScrollView, there are issues with the flow and the overall experience. Safari, Finder, Address Book and probably every other new application has some performance issues with the new ScrollView. This could be attributed to reasons apart from the bounce-back effect; and even that is very un-easy under normal usage. I compared all these applications with Google Chrome, Firefox and TextWrangler. All seem to be doing absolutely fine with scrolling just like in 10.6.* and I am not bothered with any performance hits. Anyone else with a similar opinion or have you been just all right with the scrolling?