Is it better to pray Dhuhr on time, in haste and distraction due to anxiety about being late for work, or to delay it slightly to perform it with more deliberation and devotion?

Delaying prayer beyond its earliest time to ensure humility (khushu') and tranquility is better than performing it at the earliest time hastily and without humility. This is because attaining the virtue of humility is more important than the virtue of performing it at its earliest time. The Prophet, peace and blessings be upon him, commanded delaying prayer if food is present or if the heat is intense, so that one's mind can be free and complete humility can be achieved therein. For humility is the essence and spirit of prayer.