This post is going to outline a bunch of tips and tricks to squeeze every last piece of performance out of a UITableView. In a nutshell, what affects your table is how much processing the device needs to perform for each cell requested. If you keep this to a minimum, you will have an extremely smooth scrolling experience.
There are a lot of apps out there that work great on the latest devices, however when you take these back to older models some of these apps are just horrible. It becomes clear that these apps have been built on the latest and greatest, meaning that they may not work so well on less powerful devices.