After hearing about it for too long I finally picked up Undertale (and a Switch, too). I'm attempting to avoid spoilers as best I can, but I know there are multiple paths -- I'm afraid even googling this question will lead to spoilers.
That said, while the game is fun, I'd rather not slog through all the fights again if possible (of course, I'm pretty sure the fights are plot relevant...). Do subsequent playthroughs get easier/quicker? At that point I'm interested in the plot points.
Edit: To clarify, I'm asking if the game mechanics get easier with the New Game Plus feature (faster walking, easier fights, either through stat-carryover or less objects to dodge, etc, etc).