I assume it is OK for you to use internal APIs? Then you could go with: com.sun.javafx.perf.PerformanceTracker.getSceneTracker(scene)
and let a timer fire one per second to request tracker.getAverageFPS(). Beware not to use any AnimationTimer handlers, as it will reduce FPS, even if the handler method is short. -Markus -----Original Message----- From: openjfx-dev [mailto:openjfx-dev-boun...@openjdk.java.net] On Behalf Of Michael Paus Sent: Freitag, 23. Dezember 2016 17:04 To: openjfx-dev@openjdk.java.net Subject: Re: AnimationTimer and actual frame rate Thank you. That explains a lot of what I am observing but it also makes me wonder how you could effectively measure the actual frame rate because that's what you are normally interested in. Michael Am 23.12.16 um 09:15 schrieb Markus KARG: > AnimationTimer is fired once per "planned" frame (i. e. running at maximum > possible FPS), not per "actually rendered" frame. JavaFX contains a lot of > optimizations. For example, a boolean property animated over time to switch > from false to true will only imply a single modification, hence only one > frame is actually rendered. > -Markus > > -----Original Message----- > From: openjfx-dev [mailto:openjfx-dev-boun...@openjdk.java.net] On > Behalf Of Michael Paus > Sent: Donnerstag, 22. Dezember 2016 17:29 > To: openjfx-dev@openjdk.java.net > Subject: AnimationTimer and actual frame rate > > Hi all, > > for quite a while now I am observing a strange behavior when running > some > > JavaFX graphics tests. The scenario is very simple. I am running some > animation > > which puts some load onto the graphics engine and I am trying to > measure the > > frame rate via an instance of an AnimationTimer. When I increase the > load high > > enough I reach a point where the indicated frame rate is just 60FPS or > even a bit > > lower but the observed frame rate on screen has already dropped to > something > > like 1-2 FPS. So what I observe is that the AnimationTimer is running > much faster > > than the updates of the graphics. How can that be? Does anybody have > an explanation > > under which circumstances this can happen? Or is this behavior a bug which I > should report? > > Just some puzzle for the boring Christmas holidays :-) > > Merry Christmas to all of you > > Michael > > PS: My system is a MacBook Pro with NVidia graphic card. > >
