Currently Online 
The game isn't out yet so this is potentially pre-day-one-patch.
And honestly, I think this is pretty impressive all things considered. This is one of the most uniquely demanding games yet ported to Switch, designed to push the limits of much more powerful hardware, and unlike a lot of other games that had the luxury of toning down or disabling their most demanding effects, the swarm mechanic is central to the gameplay so they had to find a way to make it work.
We tend to forget that that this is how a lot of demanding games ran on older hardware, even on PS4/Xbone sometimes. BOTW ran similarly to this on Wii U. GTA5 ran worse than this on PS3/360. Even Witcher 3 on Switch, considered to be an incredible port, could run like this in built up areas.
