Yes, sometimes the parallax scrolling effect on single page sites do need a powerful machine and a fast connection to keep up with the animation, meaning that at times you will have to wait for the page to either finish loading or for the page to catch up with as you scroll. But when they do work, there is something captivating and engaging about being gently guided through the ever-changing screen, leaving the user eager to discover and learn more.
There really is no better medium for guiding you through a story than the parallax effect. Check out these inspiring examples:
Reunite the River