The Prophet, peace and blessings of Allah be upon him, used to move at a measured pace during salah, allowing every bone to return to its place.
Abu Qatadah, may Allah be pleased with him, said, ‘The Prophet, peace be upon him, said:
‘The worst type of thief is the one who steals from his prayer.’ He said, ‘O Messenger of Allah, how can a person steal from his prayer?’ He said, peace be upon him, ‘By not doing ruku and sujud properly.’ (Recorded in Ahmad)
Abu ‘Abd-Allah, may Allah be pleased with him, said, ‘The Prophet, peace be upon him, said:
‘The one who does not do ruku properly, and pecks in sujud, is like a starving man who only eats one or two dates; it does not do him any good at all.’ (Recorded in al-Tabarani)
The one who does not move at a measured pace in his prayer cannot have khushu because haste is a barrier to khushu and pecking like a crow is a barrier to reward.