slow windows.....

[Papalazarou]

Thanks for sharing. My drivers side is really slow, do definitely worth investigating.

[Heineken]

Very good to know - that's another point on my list.

[mutley]

I recently replaced both window regulators and are still a bit slow , more work to do !

[Old guy]

Excellent observation. The passenger side will always be a little slower even if the switch contacts are in perfect condition. As you note, the power source for the passenger side window regulator originates at the master switch in the driver side door, then back out the driver's door and presumably somewhere across the dash and then into the passenger's door switch and then the window regulator (and then back again over the same path). Given that both wires to the regulator motor are switched that probably adds about 6+ m of wire that does not exist in the circuit for the driver's side regulator.

In addition to the switches, it probably would not hurt to inspect clean and apply contact enhancing stuff to all the plugs in the circuit.

You noted that you applied contact grease to the switch contacts. Did you use actual designated contact grease or dielectric grease? Dielectric grease will do a good job of preventing future oxidation of the contacts and if the contacts make good 'contact' it will not impede operation. But, dielectric grease (usually silicone) is an insulator and will not enhance contact operation. There are greases that will enhance conductivity such as Electrolube and others (I use GB Ox Gard sometimes). What also works very well is DeOxit D 100L. It is a slightly viscous liquid, not a grease; but, it does a spectacular job of enhancing the electrical operation of the contacts. The DeOxit guys now make a contact grease which has D100L in the grease along with the option for suspended metal particles to enhance conductivity . I can vouch for the D100L liquid. I have not direct experience with the DeOxit greases.

I wish I had thought of this when I had my doors apart to install the Hugo regulator kit.