again, from Ciardi’s How Does a Poem Mean?
Common Metrical Ways to Control the Speed of the Line
1. the more unstressed syllables are brought together between accents, the faster the line will tend to move
2. the more caesuras and the more stressed syllables that occur in a given passage, the slower the pace will tend to be
3. using anapestic instead of iambic unstressed syllables will speed up the line, because, in some ways, the iamb is like an eighth note, while the anapest is like a sixteenth note (Hopkins stretched this even further, setting no limits on the number of unstressed syllables in a foot, thus speeding up his lines to create his often dizzying effect)
Common Non-metric Ways to Control the Speed of the Line
1. sound patterns:
alliteration, vowel and consonant sequences, consonantal clusters, rhyme, internal rhyme, repetition of the same word or phrase
a. using all open vowels slows down a line
b. lines of equal monosyllables slow down a line
c. consonantal clusters slow down a line
d. in general the heavier and more complicated the rhymes, whether internal or at the end of the line, the more they will accelerate the pace
e. monosyllabic feet slow down a line
2. visual patterns:
the isolation of words as single lines, the separation of words from one another by unusual spacings in the line, the breaking off of lines for special effect
3. punctuation:
in one sense punctuation is a special case of visual pattern. Punctuation must be taken to include the capitalization of whole words or of their first letters, and the use of italics
4. grammatical structure:
particularly parallel constructions and balanced antitheses as devices for controlling the voice emphases of the speech rhythms.