Originally Posted by koala logs

If most of your commute passes through urban centers with lots of intersections with medium to heavy traffic, there's about nothing you can do to get faster on commutes unless you're only holding a speed of around 12 mph.

If your situation is the opposite and most of your commute is uninterrupted open / country roads, then the best possible tech can certainly help but not by a large degree. In such situation, good quality training would give you the best performance boost if you already have a decent bike.