Don't know how it effects deer movement, But I love to still hunt in a 10-15mph wind, moving ONLY when the wind blows, rusttling trees/leaves. It's incredible how quietly you can move, even when the forrrest floor is like cornflakes!

My speed when still hunting is about 100-150 yds. an hour. Gets tedious at times, but when you " move on the wind ", you slip along as a ghost.