I have a CRUD app (aka html with large tables) that was hit pretty hard with this. We updated to 1.8.1 and suddenly there were 4 second delays when users click a checkbox before it would be checked.

I managed to reduce the test case pretty significantly on jsbin:

http://jsbin.com/ubavob/3/edit

The problem came down to, more or less, this:

$(document).on("click",
               "tr[link] td:not(:has(a,input)), td[link]",
               function() { /* ... */});

It's not great code, but the 100x slow down is worse.