'fade' in this context means how the tooltips hide after the cursor left the relevant area.
It would be nice if you could control (in my case on a chart) how the tooltips fade, the default behavior waits for a little longer than 1 second before it starts fading away in a rather long animation. I'd prefer to have it start fading after like 0.2 seconds with a very short animation for example. The only option for animation at the moment is enableAnimation, but that only controls animations when switching the tooltip, not the fade animation/timings. In comparable frameworks (WinForms, WPF), you have very fine control over tooltip fading/timings.