I've heard that the game engine which was used was not optimized properly at all. There seems to be no way to improve the performance, maybe there is, I'm not too sure. After watching Digital Foundary's video, game performance has not improved at all even when overclocking.

 

You can overclock your switch but It will still lag so badly on huge areas with a lot of stuffs on screen. Seems like this game was really made for the ps4 and was just ported for the switch to get extra sales. Here's hoping there's a patch to make the lag bearable.