http://graphs.mozilla.org/#show=395166,395125,395135 Since 7/01/2008 the linux moz-central talos machines have been on an upward trend.
Tried to reboot qm-pubuntu01/02/03 and ended up with bug 450776. Before I rebooted I noted that each box had a gnome-panel app consuming 20-25% memory.
Post reboot numbers dropped dramatically and then settled on pretty consistent results. qm-plinux-trunk03 appears to be reporting slightly faster results than the other two machines, but I see now difference in configuration. Considering this fixed for now.