Just read that they'll be working on a performance update, but they think it can be done by november earliest, if the solution is easy which they dont know atm.
I also noticed the i think it's called screen tearing on switch portable mode, where the game lags for a bit and your character will move to a totally different location if a lot is happening at once.
That said, the game is fun, especially when you get a bit further on a run and the pressure of surviving is bigger!