Username or EmailPassword
well I cant really comment on your preformance problems, as far as i know debian does have preempt etc enabled by default in it's 2.6 kernel? you may want to check that, also consider googling for from desktop linux preformance tips. check dma settings x driver etc
will slackware be better? Well it's certainly alittle different than debian, more akin to a linux based bsd unix (tho even that line is getting very hazy these days, e.g. debian with a bsd..funky)
Ermm the most important point you should consider is why on earth did you even move from freebsd if you were happy with it, sure it's great to try new things, but if it's not broken...