i really liked the comments too, and the idea about rhythmic vitality. having a masterclass from murray perhia must have been great! laughed about the road construction and jackhammer stuff, but so true! you practice it over and over (to get all the way through) at the same tempo with the metronome, and then finally have to get it fast enough to 'make sense.' once you're playing it as fast as you need to, it finally soars on it's own. don't give up before you get it off the ground. precision CAN be very hard in certain sections (so really work them). esp trills.
lastly, i learned you can change fingering to make things easier on yourself. playing the piano doesn't have to look and sound hard. the more you make it look easy and are relaxed, the better you will play. fingering that allows for speed and no hops in between. say, at measure 239 last beat, my book called for using the fourth finger. i preferred to used my fifth and then on the first beat in 240 to use my third - and going back up to the C with complete 321,212345. then i did what used to be a no no in my mind. i crossed the 5 with 4 and used 432 on D C B nat. (at the same time as crossing - move hand over slightly). this seems to have helped me play the passage smoother, faster, and better. just a little change.
also, you'll come to a 'roadblock' (excepting the fact, they probably will stop you before this section) at mm. 154, 155. i use in the rh 54321234543212345 321432132143212) and, mm. 164 rh second beat 5432123454321234543212345 321432132143212) to me, the advantage is speed.
mm. 183 in the last mov't. is another roadblock to speed. in the lh you'll see finger 2 used twice for A-flat and B-nat. i use 4 on the B-natural (454321 54321 323454 323454 54321 54321 323454 323454) this makes it faster for me. please excuse if i got any fingerings off, but yo get the idea. using the whole hand (flat) makes you play much faster than sticking in fingering that trip you up.