Sometimes when I try to put the window up it goes really slowly and sometimes not work. At other times it goes really fast. This is with all windows. At night when I raise the window up I can see the gauge light dim. Also when I open the lock up somtimes all lock open and sometimes 3 of them open.
I've been advised to use a silicone spray on the runners, can take some of the strain off the window regulator.
If its all 4 windows that are going slowly as said could be your battery dying. but also check your switch it could be faulty and check the wiring (just a few cheap things to look at) and change your power window relay. Dan.