IS anyone multiboxing with 1 good computer and multiple older crappy computers?

my 2 mains run off a nicer AMD 64 XP 4000+ while my clones run each on these old AMD 1.6ghz comps with 1gb ram each. The clones are having a tough time rendering NPC's and characters and its MAJORLY interfering with /follow and clicking on NPCs. It basically makes it impossible to 5 box.

Is anyone else having these problems? I was going to upgrade to a sweet quadcore at the end of the month anyways, but this friggin sucks!