i always make a fresh installation of windowz (in a separated particion) and the software that i need for the gig before.
that way i'm always sure that i don't have any last minute suprise on software conflits
there was a post a long time ago about this...
the answer was that like other progs, like games, the cpu usage is always 100% this is to keep resolume realtime.
i gues if u really want to multitask on the vj comp u should run the other programs first and than start resolume...