It’s…not great
DigitalFoundry managed to get their hands on Dragon Quest IIdemos on multiple platforms, and the comparison test completely favors the PS4 edition.
For the most part, the Switch version looksfine in theory. It keeps up with the PS4 edition and the character models and backgrounds seem like they’re part of the current generation. But in combat, the Switch port can dip to an inexcusable 20 FPS while the PS4 consistently sticks from 50-60. Somehow the Vita port is even smoother than the Switch edition.
You can’t blame this entirely on the Switch itself, as Koei Tecmo has been known for rocky ports, but with even Zeldadipping at times the long road of optimization might be just that — long.