UPDATE: I have just made some optimizations for large grids. Please try again the same fiddle now (clear your cache) http://jsfiddle.net/JKg33/ http://jsfiddle.

UPDATE: I have just made some optimizations for large grids. Please try again the same fiddle now (clear your cache) http://jsfiddle.net/JKg33/ http://jsfiddle.net/JKg33/ Still there is some work to be done but it is much faster now.