My setup is as follows. My main Brycing machine is my 1Ghz Athlon, my second and newer machine is a 1.8Ghz Celeron and my old workhorse is a 166Mhz Pentium. I've tried using my 1.4 Ghz Laptop as well but it doesn't like to stay awake or locks up due to overheating so I stopped trying. In anycase, you are right, if your slow clunker is the host, it won't go to the next frame. I run Lightening on the slow machine and the 1Ghz is host and goes to the next frame just fine leaving the clunker behind. It's been a while since I rendered an animation on the network but the 1.8 and 1Ghz machines do make a render go faster. Adding the clunker (Which is what I was warning against) just defeats the purpose of rendering on the network because frankly, a 166Mhz machine is just too darned slow to be any use to anyone other than SETI@Home which is what it's been relegated to running ever since.