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in my experience, microwave turntable motors are AC or low voltage DC (poorly regulated, so lower AC voltage probably manifests itself as a lower DC voltage to the drive) or sometimes even synchronous AC :unsure: ... it might just be a perceived slowdown but in reality be the light being dimmer...

synchronous drives/motors, yes ... but in the case of asynchronous induction motors (most motors in a household), lowering voltage will change the speed as the torque produced is voltage dependent ... lower voltage = more slip = lower speed

It seems like it could be a wiring issue to me ... as rickf has stated, you need to check voltages on your house switchboard ... this will rule out any wiring issues between the generator and the house/appliances