I read this a few years back, a lady who considers herself to be a cleaning expert said to run the kitchen faucet till it's hot then turn on the dishwasher, then turn faucet off. Just like your tap the water starts out cold, so you are mixing hot and cold water so it's not as hot as it should be. Dishwashers usually start with a hot water rinse to get off the hard to remove stuff. Not saying I ever did this and I don't know how well it works, but just another option.
@thegoodwife:
Since i am usually rinsing just before starting the washer , it should be starting off with hot water and not having the cold water to start. I heard that somewhere in the past too. 4951