OK some info. Athlon 605e cpu, asus mobo, integrated HD4250 graphics and i think a Lite-on multi dvd drive.
uname -a gives :-
mad-desktop 3.0.0-1-amd64 #1 SMP Sun Jul 24 02:24:44 UTC 2011 x86_64 GNU/Linux
I have tried selecting an earlier kernel at boot time but it makes no difference whatsoever.
I dual boot with Scientific 6.0. This also has an issue with the dvd in that it will take 20 mins to burn a disc
but with no cpu involvement. Otherwise it's nice and snappy.
If i boot up into puppy everything is fine and dvd's durn in about 6mins. ddb16