upgraded from 11.04 a couple of months ago, and after some fiddling, such as disabling error messages and ditto reports etc, am quite happy with both speed and performance. However; on startup, I have to wait around 28 secs from login to desktop, and considering that used to take a mere 4-5 secs under 11.04, I suspect something might in fact be not-quite-right. It is an old processor, I know, but I would feel a lot more comfortable if it turned out that other 'old mac' owners experienced the same problem, if problem it is.
Additional info: 1. startup times have not increased over time, but remain constant. 2. no 'unwarranted' hangs. 3. running real-time sunlight wallpaper on startup, which lately has had problems renewing satellite image content - but should have no propblems first time of a session.