If you're referring to the "extended" tooltips, it's in OPTIONS under the Display tab.
The regular ones are instant on my machine and probably are related to the speed of your system or video card. You might try this though, ""Options" - "User Preferences" tab - uncheck the box under the "Hyperlink" heading on the right side. Apparently it's a "Display hyperlink cursor, tooltip, and shortcut menu" thing." (I found this on CAD-a-Blog)
Hope this helps (though I doubt it),
P.S. "The smell of acrid smoke and horses breath"? Know the reference? If you say, "The Charge of the Light Brigade" you're right... but not the answer I'm looking for.