very poor performance on iOS :(

Tobias Bley tobi at
Wed Jul 24 15:03:21 PDT 2013

Hi Richard and Niklas,

here are the results of pulseLogger for a simple click of a ToggleButton in a StackPane:

PULSE: 3 [12259ms:306ms]
T1 (1 +27ms): CSS Pass
T1 (28 +0ms): Layout Pass
T1 (28 +0ms): Waiting for previous rendering
T1 (29 +0ms): Copy state to render graph
T7 (56 +1ms): Dirty Opts Computed
T7 (60 +241ms): Painted
	Nodes rendered: 3
	Nodes visited during render: 3

So how can we interpret these results?


Am 24.07.2013 um 21:06 schrieb Niklas Therning <niklas at>:

> Please try running with perfLogger and also Instruments. As I've pointed out before RoboVM is in early stages of development. It doesn't do release builds yet. Virtually nothing has been done yet to optimize things for speed. So my guess is that you will find that a lot of time is spent in RoboVM code. Also, AFAIU the Oracle guys have run this on iOS internally and have seen decent performance (can someone confirm?). That would also suggest that RoboVM is the problem at the moment.
> /Niklas
> On Wed, Jul 24, 2013 at 5:13 PM, Richard Bair <richard.bair at> wrote:
> Unfortunately, I'm one of those stuck waiting for the apple developer portal to come back online in order to renew my apple developer subscription, so I can't actually try this out myself.
> Have you tried running with the perfLogger (I included instructions and how to understand the output in another thread yesterday). If you can show the output from the perf logger that would at least give some guidance as to where the time is being spent.
> Richard
> On Jul 24, 2013, at 5:16 AM, Tobias Bley <tobi at> wrote:
> > Hi,
> >
> > i would like to start a discussion about the performance of JavaFX8 on iOS (via RoboVM). If you make a little app with just one toggle button and run it on iPhone4 (not simulator), the JavaFX rendering is very slow. So the button press is painted with a really noticeable delay. I don’t understand this behavior because I thought JavaFX rendering is very good and optimized using hardware accelerated OpenGL code???
> >
> > Best regards,
> > Tobi
> >

More information about the openjfx-dev mailing list