Hi Tobias,

Sorry about that.

Looking at the bug, it seems to me that we have gotten to the bottom of it. Some iOS devices are scrolling fine while others are slower. The difference seems to be that high dpi disables optimizations and this causes the slowness on iOS. The same optimizations are disabled on the desktop, but the desktop is much faster and people don't notice. There was some discussion about performance in the simulator, but we should ignore that. Performance on the device is what matters.

iOS and Android are not currently supported platforms for JavaFX. We are looking towards the community to step up and submit patches to take these ports forward. Johan Vos and others are helping with Android. Are you interested in working on iOS? If so, please build on the patches in https://javafx-jira.kenai.com/browse/RT-31453 and take the work forward.

The first step would be to prove that we can be fast (which I think we can if we run with the optimizations) then understand how to turn the optimizations back on.


On 2014-01-03 3:28 PM, Tobias Bley wrote:

many months ago I reported the „poor performance on iOS“ issue 
(https://javafx-jira.kenai.com/browse/RT-31453). Now 6 months later the bug is 
already open and no one of Oracle answers me on Jira.

What’s up? How can we fix this important bug?


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