Slow opening/closing window

May be a bad electrical connection or binding/jamming in the window track?
The motor that moves that window may be failing.
Was there any damage to the passenger door or other unexpected event?
Perhaps you could take a short cell phone video (window down and up) and attach it in a reply so we can observe.
 
You may have already noticed that the speed of motorized devices such as the driver seat and the windows and such are affected by whether the car is turned on or not.
 
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