A DESCRIPTION OF THE PROBLEM :
As of Java 12, there is no API way to specify the animation speed of a TitledPane.

It would be a nice addition to have a new public property to be able to specify the animation speed of a single TitledPane.

The workarounds I found here https://stackoverflow.com/questions/33298363/javafx-titledpane-animation-speed/39421355#39421355, are not very comfortables..

Also reported here https://github.com/javafxports/openjdk-jfx/issues/497