Hi all,
I am using kubuntu 9.10 on what is a fairly new machine
But i am not able to use some applications properly

I used skype on gnome(on a much slower machine,if that matters) but on this its pretty slow
the audio lags behind the corresponding actions etc
so the call quality is also screwed up

Another one is xbmc(media center)
This one was really slow
Even the mouse motion was really slow
I somehow managed to close it

Any applications tweaking ideas?

Thanks