If there is any question whether web performance and web operations is hot, you need only look at the attendance and interest in this year’s O’Reilly Velocity conference. We’re told that the total attendance topped 1,200 — which is more than both previous years combined. In its third year, Velocity is quickly becoming a must for any web-based company. Below, I will attempt to summarize the general themes from this year’s conference, and point out the most important trends/tools/news….