It is narrated by Abu Qatadah [ra] that the Prophet (saw) said, “The worst kind of thief is one who steals from his prayer.” The companions said, “O Prophet of Allah how can someone steal from their prayers?” He (saw) said, “He does not fulfill the ruku of the prayer nor its sujood.” [Ahmad]
The Prophet (saw) forbade that someone should peck (in Salah) like a crow. [Ahmad, Abu Dawud]The Prophet (saw) said, “Verily, a man will leave from (his Salah) and only a tenth of his Salah is written for him, a ninth, an eighth, a seventh, a sixth, a fifth, a forth, a third, half.” [Abu Dawud and Tirmidhi]
"Salah isn't a race, don't rush through it. 'We have divided the Qur’an in portions, so that you may recite it to the people gradually.' (17:106)"