pageAccelerator is a very light solution to load web pages faster. It's an agnostic library that uses ajax and pushState to deliver a faster navigation experience.
pjax is a jQuery plugin that uses ajax and pushState to deliver a fast browsing experience with real permalinks, page titles, and a working back button
jQuery.scrollSpeed is a lightweight jQuery plugin for modifying vertical scrolling speed in modern web browsers.
It works in all major browsers and IE7+
scrollToBySpeed is a jQuery plugin for scrolling page to an element with speed instead of duration.