Reduce the number of DOM elements

The more code a browser has to load the longer it will take that browser to process the page.  You should evaluate the number of DOM elements (which can include div, table, span, and the like) being used and reduce any that are not necessary.

Some types of excessive DOM elements could be nested tables (you should avoid nested tables if possible) and Div that are only being used to correct layout issues.  Evaluate your site for the most semantically correct way to markup your page.