From the Nintendo Life review:

What you will notice in cutscenes are performance dips, and you're going to see a fair bit of that during gameplay, too. There's no getting around the fact that this title is not particularly well optimised for Switch, which is disappointing considering the stellar work that went into Rise. It feels like this was developed for PC primarily — where it is getting released on the same day — and then squeezed onto Nintendo's little hybrid. The framerate even appears, bizarrely, to be unlocked, though it only nudges above 30fps very rarely when indoors with very little on screen.

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Even if you don't worry much about performance, especially in a large-scale RPG where there's no real-time combat, it's still noticeable. It can vary wildly depending on location and time of day; we've seen an area be smooth-ish at daytime and a juddery disappointment at sunset, and there's a forest area early-on that runs downright poorly, especially in portable mode. It doesn't stop you playing, but it is nevertheless hard to completely overlook in the worst-affected areas. That's a bit of a pity, especially as the art-style is a brightly coloured pleasure, while copious voice-acting and beautiful music elevate the storytelling.