The Moon's orbit is not a normal orbit most are used too.

The Lunar orbit is an ellipse and that changes the orbit speed pending orbit location.

The actual speed in crease/decrease is roughly 6%. But in combination with Earths rotation it APPPEARS to move 12% faster at it's fastest point. It will appear 12% slower at the slowest point.

A spread of 24% is a large difference.

So some nights the Moon will appear to creep along while other nights it can race across the sky.