fugit … tempus – the Roman poet Vergil (70-19 BC) writes in his Georgics – time flees or flies: Sed fugit interea fugit irreparabile tempus/singula dum capti circumvectamur amore. (Virgil, Georgics III:284-5).
That time flees or flies is a commonly shared experience and a truism. Virgil however says, time flees irreparably from you while you are enamoured of the things around you, in other words, be aware, he says of what you are doing while you are doing it because the hour is precious and not recoverable.
Seen in this context slowing down could mean to reflect on the things important to you and to afford them the time they deserve.