@mgnoodle depends.

Optimization could be better(they were definitely too generous trying to have that 1080p resolution when docked instead of a more reasonable 720p, and LoD could be more optimized).... but performance are actually really okay, especially during story mode.

In story more you can generally expect 25-30FPS since even the bigger lands are sometimes cleverly optimized.

The issues are when you visit other player's islands that are so over engineered(fully furnished skyscrapers everywhere, entire subway networks under the ground, etc) but without an eye for optimization such that even the PS4 Pro version players end up getting only 14-17FPS performances.

On Switch the lower performance are largely offset by the portability that lets you tweak your build just a bit more wherever you are... even in your own house(sharing an household with others this has been a godsend) which definitely helps it retain a fair bit of appeal especially for less intensive Builders or at least the more intensive ones that know how to keep an eye for performance optimizations(for some players will make sure that nonessential purely aesthetic structures are filled-in with blocks since "filled" spaces don't seem like that have to be rendered but hollow spaces might be, making the even more complex "furnished" ones heavier to process).

Plus, on re: handheld play, since handheld keeps to a more reasonable 720p, some players have even reported when playing in handheld mode than the more intense 1080p docked resolution.

Ultimately the game give you a lot of freedom but on the flipside that also mean "freedom to turn your game into an interactive slideshow framerare even on the strongest hardware" if you're not careful.

This said since so much seem to be dependent on how players build stuff, I like it in the sense of actually introducing(even if that wasn't the intent) players to the challenge of optimization when developing levels/etc in games.

Honestly though the only improvement I might argue in favor of is that it would have been a perfect game for a dual "performance / beauty" setting option like other games such as Rocket League and others have done.

You would use lower(720p) resolution, shorter view distance and more balanced LoD in performance mode for a better framerates and could switch to the more intensive "beauty" mode when wishing to take screenshots(as can be shared on the online noticeboard) where framerates is less important.