Breckman,

I believe the old mercedes power windows are inherrently slow (like the dash lights are inherrently dim). Hard to know if yours are worse than most but if you are comparing them to a "modern" car, forget it. My wife's subaru outback's windows fairly fly compaired to my 300CD's windows.

The regulator is the metal contraption that holds the glass and moves the whole show up and down.

Nic
300Cd @ 149k miles