Hello David
No, because visualizing the speed, you want the ball to leave (and travel at), is a more reliable technique. In the “More” section, under Putting Routine is the Lesson Video: https://duplessisgolf.com/area/puttingroutine.html I recommend watching all the putting lesson videos there. Another good way to feel speed of a putt… is to toss a golf ball, underhand while standing on the green and feel the imaginary speed you think will get the job done. Pushing down, then pulling up with your front shoulder, at different speeds, will create different results. Let you shoulders rock at the speed you need to create. We want the backswing and downswing to be natural as if you were tossing something… thinking ratios or lengths of backswing/follow through are restrictive and are missing feel and touch. One other important thing about good putting is… it is a “stroke” it does not have a “hit” at the ball. The ball is just in the way of a smooth continuous flowing movement.