I took another look, and confirmed that the plastic clips that hold the regulator to the window are in perfect condition, and the bolts are tight. So, something else is causing my window to move at a snails pace. I don't mind ordering and installing a new regulator if that's what I need to do, but I want to be as sure as I can that I wouldn't be throwing money away on something that isn't needed.

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2003 X5 4.4i
1992 Porsche 968
2007 328i
2014 Subaru Forester XT