As part of my Movable Type 4.1 upgrade project, I noticed that depending on my template settings, republishing the whole site would get extremely slow. Movable Type sometimes catches flak for this because it’s designed to serve static pages, so the "build" time tends to be a bit slower. (A good tradeoff in my opinion.) There is much room for improvement on the rebuild times. It looks like the next release of Movable Type will focus on performance and scalability, so here’s my first contribution to that effort. After some trial and error, I discovered that the Archives sidebar widget…