Earlier quoted context omitted.
Also, its very important to run your sink to full hot temp prior to starting the washer. (in 99% of dishwashers, they pull from the hotwater supply to the kitchen sink. Dishwashers will do a ~15 minute pre-spray (without soap) initial rinse. If you dont pre-warm the sink line, then the dishwasher will start with a cold pre-wash, thus will not put dishes to temp as quickly in the cycle.
That is probably regional. Here they are most commonly connected to the cold water line.
I believe most modern dishwashers simply sense the incoming water temp though and basically just pump the water through until they get to hot water.