Driver for C3760dn on Windows extremely slow

I have a Problem with my C3760dn Color laserprinter. I working with Windows 10. The Printer is connected over Network.  The printing especially in Duplex mode is extremely slow (more than 1 Minute per page!). I tried PS as well as PCL Printer Driver with the same result. The Network itself is not the Problem, since other printers are working with normal speed. Is there anything I can do ?