If you do (and you should) care about your Episerver Commerce site performance, you probably know that database access is usually the bottleneck. Allowing SQL Server works smoothly and effectively is a very important key to the great performance.
We are of course, very well aware of this fact, and we have spent a considerable amount of time making sure Commerce database works as fast as we could. Better table schema, better stored procedures, better indexes, … we have done all of that and will continue doing so when we have the chances. (And if you find anything that can be improved, you are very welcome to share your finding with us)
But there are places where the database performance improvement is in your hand.