Brian, is that to say that the leadfree stuff is a better conductor? I would imagine that in many instances the solder is the current carrying conductor. When I solder my connectors, only relatively small parts of the wire are actually touching the the connector. I just assumed that the solder also served the purpose of carrying current.

Perhaps I should go pick up some of this leadfree stuff and re-do all of my equipment.

On the other hand, car battery terminals are made of lead, aren't they? Or is that comparing apples to oranges, due to the different loads involved.