How Can I Reduce The Weight Of This Page?

Post all the code is really bizzare (1200 line more or less) so I create a fiddle for this. The whole page is really slow, also when I try to manage items on the DOM with Firebugs

Solution 1:

Instead of having everything editable at once, only go in editing mode once you click an edit link for the row (asp.net style) or when you click on the row itself (devexpress style), and only then show your editing stuff for that row only.

The easiest way to make pages faster is to remove the controls from it :)