Custom speed for flkty.select(0)?

[ShiyaYuan]

Test case: https://codepen.io/desandro/pen/azqbop

Hi I'm trying to use flkty.select(0) and flkty.next(true) to allow users to go back to the first slide when on the last slide. But I find the transition speed to be too fast, is there a way to customise this speed?