[John]

Initial speed differences are probably due to the slower threads not having been loaded yet since the last server reboot. So the initial loading of a thread will be a little slower for that reason. After initial thread loads they are usually cached in memory, making them faster.

I have GC on different physical server hardware compared to what we've been on for approximately the last 18 months or so. So trying to get an idea of how this setup compares to the other server hardware.