Remove all the function/method call of tableView in - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath, you should configure the tableView in the -viewDidLoad or -loadView.
To improve scrolling speed, I recommend you checkout this: http://blog.atebits.com/2008/12/fast-scrolling-in-tweetie-with-uitableview/.
