So, I wouldn't expect them to be slower (except in the most extreme cases with aerodynamics), since you can make anything go fast with enough power.
But along that line of thinking, I would expect larger tires to require more energy to keep at speed. A larger tire with a a larger contact patch implies a greater deformation of the tire, which in turn implying greater energy loss.
Cars, using a measurement of gas mileage, have shown this. Smaller contact patches (a condition created with over-inflated tires) result in higher gas mileage, whereas larger contact patches (under-inflated tires) lower gas mileage.
But along that line of thinking, I would expect larger tires to require more energy to keep at speed. A larger tire with a a larger contact patch implies a greater deformation of the tire, which in turn implying greater energy loss.
Cars, using a measurement of gas mileage, have shown this. Smaller contact patches (a condition created with over-inflated tires) result in higher gas mileage, whereas larger contact patches (under-inflated tires) lower gas mileage.
I didn't see this addressed directly, that I saw.