It doesn't exactly"read them faster". It's that vx is running at 60fps, so everything works a little bit faster. There should be a way to change the speed without having to use 4 frames.
if @anime_count > 18 - real_move_speed * 2
I found this in the default script, Game_CharacterBase changing this will affect all the sprites, so keep that in mind. To make it slower, change the 18 to a higher number.