Pardon me for asking as this is kind of an old thread now, but did your Pfaff1222 come back in sewing shape? I have a Pfaff1222E and it has always sewn slowly as compared to a New Home or today's Janomes or any other machine, including my old 1971 Kenmore - it sews at a reasonable speed, but I would say that to me it has always seemed slow. I think it may be the nature of this machine. I do love it, and have had it now for 35 years. I have heard that if the connections on the foot pedal were cleaned it MIGHT help the speed, but I do not want to fiddle with it because everything works!
I hope that your machine has come home and is sewing for you.