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I'm sure the speed will be set by the motor speed and gearing and almost certainly won't be adjustable. You could make sure all the sliding and moving bits are well lubricated, as it may speed it up a little. A bit of silicone spray in the sealing strips around the window can help too.
Currently in martin999's garage:
2011 (11) VW Passat 2.0 TDi SE + options in Island Grey, 2011 (11) Honda CB1000R in Pearl Cool White... oh and a 2004 (54) Secnic II 1.5dCi Dynamique in Ottoman Blue !