I did the Big 3 and noticed a slight difference, but nothing major. Of course my motor has only been in for about 3 months and when it was out I sanded\cleaned\sealed every connection I could. throw a volt meter on your car when you roll the windows down, normal voltage with no accessories at idle should be around 14.4v. Even with accessories on it should be 14.4 +\-10%. If it's to low, start cleaning grounds and your positive connections.
Also, while you have the door apart, grease up the tracks and cables. The easier the window moves, the less work the motor has to do, the faster the window moves.
