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The first and best place to make cuts is Munasukaru's Penance. You can seriously remove 3/4ths of the encounters without affecting anything important.
Here are some more specific cuts I'd suggest:
There's a lot you could cut from Ravenscraeg, but choosing is hard. You can reduce the number of ninja in the fortress, but you need to keep enough to establish that it is indeed a fortress full of ninja. The ochre jelly, the spider eater, the hellwasp swarm, the executioner's hoods, the giant crawling hand, the samurai guardian statues, the trolls, the blindheims, and even Jorgan are basically just bonus XP fights, but they provide much-needed variety from killing ninja. So maybe try burying the ninja in an avalanche.
You could conceivably drop the entire Katiyana sidequest, since it's just a one-time obstacle in the story arc, but that leaves the current adventure with zero plot. So I'd do an abridged version: skip either the dragon or Tunuak, turn the Storm Tower into one or two big fights, and remove a few encounters from the Spirit Road, starting with the yetis.
Caution: Shinju no Ie's dungeon is a maze! If you don't drop it, tell the party the solution right away. Overall, this is a much better dungeon than the last one, with lots of cool encounters, and so I suggest keeping it mostly intact; however, the only encounters you should absolutely keep are the shogi board fight and the illusionist.
The onsen is at most three or four encounters long, and the siege is just one humongous fight, so you're probably fine there.
Actually removing encounters from the Jade Palace is probably a bad idea--this is the BBEG's lair, of course it's jammed with monsters! Instead, have the entire party's roster of allied NPCs help assault the Palace in an epic battle royale. During a thunderstorm, of course. While they handle the small fry, the PCs have enough freedom to beeline for the Jade Throne and fight the endboss party.
Oh, and find some excuse for the Jade Palace to crumble around the PCs while they're fighting said endbosses. (Actually, at level 15, who needs an excuse?) Besides that a disintegrating throne room in a thunderstorm is a totally rad location for a final encounter, this lets the PCs watch their allies continue to fight outside while they deal with the Jade Regent.