Posted by jmaasing on Sep 21, 2013; 2:53pm
URL: https://forum.jogamp.org/GLJPanel-lagging-by-one-frame-when-multisampling-is-on-tp4030087p4030088.html

I haven't worked with those classes but it almost sounds like some double buffering going on. Display() draws to a buffer that then (isn't) blitted to the screen.
Maybe the status oF GLCanvas.getAutoSwapBufferMode() can give a hint?