A few years ago I finally gave up using windows for my main development machine. So I installed the latest ubuntu and I've been keeping up until 10.10, which is what I have now. The machine is a core 2 quad 3ghz with 8 gigs of memory. I run a lot of stuff sure, but I use no swap, and everything runs along speedily, but every once in a while I get a 2-3 second lag before my keyboard input is processed.
I watch the system monitor, and vmstat and iostat, and there's nothing going on.
I think the machine is fine, and there's something wrong with gnome, but I have no idea what to fix or configure. Windows has a lot of problems, but it gave a lot of cpu priority to the mouse and keyboard, and was far less annoying to use in this regard. Any suggestions? I've got 47 day uptime, and if rebooting is the answer clearly linux still has a long way to go.