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Slow windows can be:
Weak motors (as they age they get moisture in them/corrode/move slower)
Lack of Lube on the Regulator - lube the regulator gears and slides
Excessive friction on window seal - lube the seal the glass slides between with graphite
Low voltage in car? - Probably not the cause, but check the car's voltage when running....if its not charging right you may not be getting much juice to the windows.
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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