Why do slick slider effects appear with a delay when passing through a full circle of elements?

Question

HTML

Good day. Please explain why the slick slider, if in JS it has the value infinite:true, when going through a full circle of photos (example: you have 6 photos in the slider and you went through all six - the photos started from the beginning) when switching from the last photo "cycle" on the first effects appear with a delay? and any: shadows, increase, displacement. met with this repeatedly, I think that the question is not private, but general, tell me, please, why and how to remove it?