One of the attendees of one of my regular meetings could be characterised as Slow Sam.

The meeting moves at a certain speed, there are a lot of facts thrown around and summaries given and most people in the room pause, synthesise the information, get the point, nod, and get on with the debate. However, three minutes later Slow Sam will start looking bewildered, and eventually stop the meeting and take everybody back and question the complete line of implicit argument that's just been handled because she doesn't get it, or doesn't agree with the conclusion because she's either missing or ignoring some vital facts. The problem is she slows the pace of the meeting right down whilst everyone reformulates metaphors or reframes the question or answer til she's satisfied she's understood and agreed with the assumption that seemed so simple ten minutes ago that everybody else just took for granted. Slow Sam is great at getting the Laptop Larries to take their portables out as they lose interest quickly and don't help at all, or worse, look it up on Wikipedia in a misguided attempt to help.

In my case, Slow Sam is sometimes the Snake, or at least her opinion is highly valued by our Anchor. So she really does set the pace of the meeting. She really is indispensible, too. 90% of the time the process is frustrating, however, the other 10% of the time she does actually find some flaw in the logic, or give the other members of meeting time to think laterally and challenge the assumption that was made in new and exciting ways.

Beware of raising Slow Sam's ire, by not explaining stuff she needs to know. She will end up stopping the meeting completly and just throw remarks around that make her sound like Curveball Kurt. In fact, She is sometimes difficult to distinguish from Curveball Kurt. Also, beware of spending too much time explaining to Slow Sam, at some point the Anchor or a Sally needs to cut the losses and move the meeting on.