There are two main things that swimmers should be focusing on every time they hit the water. The first is decrease our resistance in the water and secondly, increase our propulsion. Decreasing resistance is a major key to improvement. There are several forms of resistances we should be striving to eliminate from our swimming.
I've always felt that Breaststroke was seen as the lazy cousin to the other three IM strokes within the swim community. Some believe it to be the easiest stroke and the slowest. Unfortunately, I can't argue with you on Breaststroke being the slowest. Just the natural movements of Breaststroke make it slower and less streamlined than its counterparts, but this doesn't mean that it's for the lazy or is easy to do.