Read the poem fast. When a poem's tempo is allegro, read the lines fast and cheerfully. Coming from the Latin term "alacer," which means lively, allegro is a brisk and joyful tempo for poems carrying a positive meaning.
Read the poem in moderate speed. When the poem's tempo is defined as "moderato", then read it in a moderate pace, not too slow but not too fast either. Usually this tempo is combined with other terms in order to give a better direction on how a poem should be read or a musical piece should be performed. This is why we often see "allegro moderato" or "lento moderato", when the poet wants to be more specific as to what the poem's tempo is.
Read the poem slowly. Sometimes the poem's tempo is stated as "lento" or "largo." Deriving from the Latin words "lentus" (slow) and "largus" (generous), these two terms refer to a slow tempo in which the poem's lines should be read. When the poem's tempo is "lento/largo", then you are meant to read it unhurriedly and with dignity.