Selection of proven performance tips and tricks for jQuery, including tips for performance measuring tools like jsperf, faster selectors, traversing the DOM, variable caching, events, dom manipulation, loops and DRY code.
It’s a must read for everybody who uses jQuery. After reading you will definitely write faster and more performant DRY code.
http://www.slideshare.net/AddyOsmani/jquery-proven-performance-tips-tricks