New Sun workstations have USB keyboards and mice (mouses? meece?), but they're really picky about what kind of USB KVM you use (assuming you're using one). I think this is because many USB KVMs appear to the computers as if you're removing and reinserting the keyboard and mouse when you switch away from and to the computers.

This could conceivably be why it takes so long to switch. Then again, I have very little USB experience and even less USB KVM experience, so it's easily possible that I'm talking out of my ass.