Hover Delay on AJAX Popups
Currently it is very easy to bombard a site with simultaneous requests by quickly moving the mouse across all the wiki links on a page. As soon as the mouse touches a link, it triggers a request to the server asking for a preview of the link.
I believe it would significantly reduce server load, by spreading out the AJAX requests over time and eliminating accidental requests, if the user were required to hover over a link for at least 1 - 2 seconds in a row. This would ensure the user's intent in wanting to see more about the link, and allow the pop-up functionality to remain turned on on many boards.