You're not the brightest bulb in the box, are you?
Believe it or not it's not unfounded. Frame rate wise both versions are similar, with the Switch technically edging out but it still struggles in the same spots. Meanwhile the Switch version universally loads slower, something close to a second per load. Speedrunners use the Wii U version for this reason.
I'd blame it on poor optimization though. The game is... Well it's a mess in nearly every aspect to be frank.