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.
Pegasus is a simple JavaScript solution to improve your average time to display data. Using this technique, you can reduce the time to display data in single page apps without touching the server.
It works in all major browsers and IE7+
scrollToBySpeed is a jQuery plugin for scrolling page to an element with speed instead of duration.