I would like to know how fast a servo motor can be started, accelerated and brought to a halt

You might like to click on the following search. You might find some helpful answers there.

servo motors - Google Search (http://www.google.com/search?hl=en&safe=off&q=servo+motors)

But, others might come along with more sufficient answers also.

Do you want fastest speed or typical speed or what? A couple of Google searches for spec. sheets will give you the figures you're after.