Timed my son yesterday on the football field (grass). With new balance 4040 turf shoes then with new balance 4040 cleats.
Turf shoes - 7.02 and 6.86
Cleats - 7.31 and 7.07
Son said the turf shoes felt lighter and more comfortable for sprinting. He decided he will use those whenever he is running for time. Just thought I would come back here to share for others.