The game feels rather sloggish as a player as well, it feels like you are walking through tar with how movement is almost like pulling a chain around with a weird feeling of input delay because of how characters gain momentum in the engine. The rate for the string combo is also slower than one would expect and takes a lot of time to get used to.
Playing the game at 150% is borderline unnoticeable until you drop back to the original clock speed (except for the music but most of it is actually still pretty good when sped up). Incidentally at 150% the string combo is doable with just mashing alone. Heck, even the narration is improved by the speed-up.