Switch loads are different than pc loads. thats a decent timeloss since every category, with the exception of categories that beat the genocide ending, have flowey loads, glitchless categories having several other loads. mashing is the exact same as PC JP mashing, that is, slow and annoying because of not great inputs. Ontop of that its identical if you hook up a keyboard, something that undertale natively supports on the switch, similar to how undertale PC natively supports controllers. In genocide, switch is 100% the fastest version, due to having a switch exclusive exploit at the very end after killing mettaton neo, known as long elevator skip. Why does it exist is a mystery to everyone here, but more than likely it was intentional so its allowed for glitchless categories to as long as its the switch version, played on a switch.
