Thanks for posting back- we are actually working on some of the tools that we've unfortunately neglected a little. The next bout of work is targetting Doc and Data Generator, but Dependency Tracker is slated for some work later in October right now.
Most of the slowness will be down to the SQL Compare engine which SDT uses under the hood to examine and build up the model of the database it works with. We've made some improvements to the speed of SQL Compare recently, and the next build of SDT should inherit this, so it's likely that when we do release an update it should perform faster.
We've also set up a Uservoice for SDT here
so you can start to add any suggestions in there which we can take into account down the line.