I don't know if I can call it the worst port ever, but I agree with OP that it's reaaaallly bad. The framerate drops, crashing, muddled graphics and slowdown are pretty atrocious. After seeing how it looked running on PS4 (Just base console) vs Switch side by side in person, I'm was amazed at how poor the Switch version was. I'm not a technical/graphics whore by any means, it's just that bad.
I wonder if the graphical overhaul the game got late into development is what caused a lot of the issues for the Switch version, or if it just always ran this poor on the system? Either way, it shouldn't have been put out in this state and I never would have brought it on Switch had I know how poorly it ran.