[External] : Re: Preload fxml to avoid slow show()

[Andy Goryachev]

1. which version of jdk/jfx are you using?
2. have you tried profiling your application during FXML loading?
3. have you tried looking at the heap allocation (using VisualVM or a similar tool), to see where the bulk of memory consumption is?

-andy

From: Davide Perini <perini.davide at dpsoftware.org>
Date: Friday, August 25, 2023 at 16:16
To: Andy Goryachev <andy.goryachev at oracle.com>, openjfx-dev at openjdk.org <openjfx-dev at openjdk.org>
Subject: Re: [External] : Re: Preload fxml to avoid slow show()
I tried it, 99% of the heavy lift comes from FXML load.
I have 80Kb of FXML files, nothing particularly big,
I measured the laoding time on a 13900K CPU and it requires 1.8s.

Once loaded, I don't know how this is possible, my apps sucks 100MB more RAM but after the first load,
opening/closing the tab pane is much faster.

I sincerely can't understand how a tabpane can suck 100MB od RAM and how 80Kb of FXML can require almoast 2 seconds to load
on the world fastest consumer CPU (single thread).

I see that there are dozens of similar threads on the internet so this should be a known problem
and at this point, I think that I'm out of luck.

Thank you anyway,
Davide

Il 25/08/2023 23:55, Andy Goryachev ha scritto:
Another suggestion might be to load tabs lazily.  I don't think FXML "pre-loading" is possible.

-andy



From: Davide Perini <perini.davide at dpsoftware.org><mailto:perini.davide at dpsoftware.org>
Date: Friday, August 25, 2023 at 14:31
To: Andy Goryachev <andy.goryachev at oracle.com><mailto:andy.goryachev at oracle.com>, openjfx-dev at openjdk.org<mailto:openjfx-dev at openjdk.org> <openjfx-dev at openjdk.org><mailto:openjfx-dev at openjdk.org>
Subject: [External] : Re: Preload fxml to avoid slow show()
My tab pane is very complex with a lot of tabs,
having an FXML is very welcomed.

Thanks
Davide
Il 25/08/2023 16:45, Andy Goryachev ha scritto:
You can try creating the scene graph programmatically, thus avoiding FXML entirely.

-andy


From: openjfx-dev <openjfx-dev-retn at openjdk.org><mailto:openjfx-dev-retn at openjdk.org> on behalf of Davide Perini <perini.davide at dpsoftware.org><mailto:perini.davide at dpsoftware.org>
Date: Friday, August 25, 2023 at 00:45
To: openjfx-dev at openjdk.org<mailto:openjfx-dev at openjdk.org> <openjfx-dev at openjdk.org><mailto:openjfx-dev at openjdk.org>
Subject: Preload fxml to avoid slow show()
Hi,
I have a tabpane with 15 tabs, every tab has his own controller and it's
pretty crowded.

On a 13900K CPU, show() method requires more than 750ms,
this feels laggy...

After the first show() call, loading the tab pane is much faster...

Is there a way to "preload" an fxml?

I tried to show() and hide() it immediately and it seems to help,
but what is the best way to do it?

Thanks
Davide


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