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I really like this context menu solution, and I wanted to use it for thousands of context menus on a page. When there are that many menus, I discovered a bit of page lag.
Here is a fiddle to demo the lag and the fix: http://jsfiddle.net/zebfross/N2e9x/14/
The fix for page lag was in context.initialize; I changed ".dropdown-context" to ".dropdown-context:visible". The speed of building the menus can be improved substantially by using native DOM manipulation instead of jQuery.