When a duck swims in the water, the bigger the ripples around it, does it mean that the water is more resistant or swimming too fast?

The bigger the ripple, the interference of waves is actually involved.

Wave interference, physical phenomenon. The superposition of two waves with the same frequency strengthens the vibration in some areas and weakens the vibration in some areas. The areas where the vibration is strengthened and the areas where the vibration is weakened are separated. This phenomenon is called wave interference. The pattern formed by wave interference is called interference pattern.

As shown in the figure below, it is also an experimental phenomenon of water wave interference.

Whether the above picture is similar to the water ripples seen by the subject is a physical phenomenon of water wave interference.