When you mouse over a link with a heading, after a while it will display the heading as a tooltip. Is it possible to remove this delay or change it so that I quickly show the tip?
It is strictly browser dependent. If you need special tooltips, you should consider a JavaScript solution.
Here's a tutorial on replacing browser prompts with custom ones: http://www.switchonthecode.com/tutorials/jquery-custom-tooltips
, /os. JavaScript, : qTip
You can generate something similar to those using Javascript or CSS, but you cannot change the behavior of this, as it depends on the browser and OS.