How does Juliet's soliloquy in Act 2, Scene 5 compare with her soliloquy in Act 3, Scene 2 of Shakespeare's Romeo and Juliet?

In both soliloquies, Juliet is waiting, and her wait is related to feeling of love. In Act 2, Scene 5, she is waiting for Nurse to bring news from Romeo about wedding plans, while in Act 3, Scene 2, she is waiting for Romeo to come to her room for their wedding night. Since both soliloquies have to do with waiting and love, both are filled with images related to waiting, speed, and love.

In Act 2, Scene 5, she is feeling particularly annoyed because Nurse has not yet returned, and it is already high noon when Juliet sent Nurse to meet Romeo and nine in the morning. But more importantly, Juliet is very eager to learn if Romeo really does intend to marry her. Hence, Juliet complains about Nurse's infirmity, possibly obesity, and wishes that she could know Romeo's mind just by hearing his thoughts, as we see in her lines:

O, she is lame! Love's heralds should be thoughts,
Which ten times faster glide than the sun's beams
Driving back shadows over low'ring hills. (II.v.4-6)

In these lines, she uses a metaphor to describe the speediness of love's thoughts, saying that the thoughts of love move "ten times faster that the sun's beams." She continues her analogy to describe the sun's beams chasing shadows away from the hills. Comparing love's thoughts to the image of sun beams helps paint the picture of warmth and happiness for the reader. Even though Juliet is eagerly waiting, her general attitude is happy because she is in love. In addition, sun beams move fairly slowly, so the image of moving sun beams helps characterize for the reader her feeling of impatience.

In Act 3, Scene 2, Juliet again uses sun imagery and figurative language. But this time, she uses them to describe the haste she is longing for. We see her using a sun image figuratively in her very first few lines:

Gallop apace, you fiery-footed steeds,
Towards Phoebus' lodging! Such a wagoner
As Phaeton would whip you to the west
And bring in cloudy night immediately. (III.ii.1-4)

These lines are referring to the Greek sun god, Phoebus Apollo, who was believed to ride his chariot across the sky to direct the sun into both sun rise and sun set. Hence, when she refers to the "fiery-footed steeds," she is referring to both the sun and Apollo's chariot because the chariot represents the sun. She is using the analogy of likening the sun to Apollo's chariot in order to conjure up the image of speed. Not only is she metaphorically referring to the sun as Apollo's chariot, she is also personifying the sun as his chariot horses, which are both forms of figurative language. Since she is using the figurative language to express her desires that the sun would set faster, she is, again, using the image of the sun and its slowness to characterize her feeling of longing and waiting.