1991 Buick Century Wagon Windows very slow to close

I have trouble with the windows that are worse when it’s wet out… bad timing. The back left window won’t open, the driver window goes down, returning to closed is slow, the passenger front is VERY slow… takes several tries spread out over an hour or so. The back right window is fine. Ideas?

Start by pulling a window switch and finding out if a full 12 volts is arriving to the switch.

Then you’ve likely go dirty and sticky regulators, weatherstripping tracks, and electrical connections. Cleaning it all up and relubing where appropriate would likely help a lot. This will require pulling interior door panels.

With a twenty year old vehicle, it would come as no surprise if the window regulators were worn out.