[LAU] ubuntu xserver eating my cpu

Hi I'm (still) in the process of trying to set things up as nicely under ubuntu as they are under debian. Now I'm having rocksteady realtime performance under heavy load, but the guis get very sluggish, whereas whey used to be quite good under debian. An example test project uses about 58% for jack-stuff. But while htop under debian lists x as using about 6% it's about 50% under ubuntu. Total cpu usage under debian is about 90% (still very responsive) while under ubuntu it's 100% (and very unresponsive). I'm not sure if it matters but I notices that x/debian runs at priority -15 (the number says "15") and x/ubuntu is -25 (the number is "25"). If this number matters what should it be and how do I change it? What could it be that is so different under ubuntu that it's x is so much more cpu hungry? Any idea where to look to narrow the problem down? Where can I read more about how to configure x to behave the best under heavy realtime load? The setups are almost identical: xorg, openbox, ardour (2.0.3 from source), ghostess (from source), + recent specimen and zynaddsubfx. -- peace, love & harmony Atte http://atte.dk | http://myspace.com/attejensen http://anagrammer.dk | http://atte.dk/compositions -- peace, love & harmony Atte http://atte.dk | http://myspace.com/attejensen http://anagrammer.dk | http://atte.dk/compositions