@norman thank for the report will have a look to see if I can reproduce and hopefully get a fix up.
@schwaller, unfortunately due to the changes made by Apple/Oracle to AWT/Swing (moving from NSView to CALayer embedding and removing NSView option altogether) its no longer technically possible to get the speeds with OpenGL we previously enjoyed with JOGL and LWJGL (2.8.5 and lower). This is because content needs to be drawn at least twice due to the way CALayers work. JavaFX is likely to run into the same issue when using a third party OpenGL binding. The fastest OpenGL option would be to use the native Display window instead, you could use one of the a feature rich
OpenGL GUI systems like TWL or Nifty to replace the AWT/Swing bits (impressively Eclipse has been ported to run on TWL! which shows how capable and mature the library can be). If you still want to go for AWT/Swing for the gui you could try the separate window option where you have separate controls window (AWT/Swing) and a separate native Display window for the video rendering (like VLC media player).