deck-context.js
 import { useRouter } from "next/navigation";
 // ...
 const { prefetch } = useRouter();

 useEffect(() => {

  if (slideIndex < slideCount - 1) {
    prefetch(`/presentation/${presentation}/${slideIndex + 1}`)
  }

  if(slideIndex > 0) {
    prefetch(`/presentation/${presentation}/${slideIndex - 1}`)
  }

 }, [router, presentation, slideCount, slideIndex])