Performance Regression in 21 - CSS

[Christopher Schnick]

Hello,

I just tested this with our JavaFX application and can confirm that 
there are massive differences. It takes around 1-2 seconds to completely 
apply all application stylesheets in JavaFX 20 but takes around 6-7 
seconds in JavaFX 21.

On 12/31/2023 3:00 PM, Florian Kirmaier wrote:
> Hi Everyone,
>
> Sorry for the delay - but I couldn’t find the time to extract the 
> TestApplication for this bug.
> Luckily, I found another application, which is also open source, which 
> is affected by the application.
>
> I'm speaking about https://www.jfx-central.com/ - both the desktop and 
> web versions are affected.
> I’ve seen a performance deterioration of 10x when switching pages when 
> using JavaFX21 compared to JavaFX20.
>
> I’ve created a ticket with further instructions on how to test it:
> https://bugs.openjdk.org/browse/JDK-8322795
>
> Greetings
>
> Florian Kirmaier
>
> On Fri, 27 Oct 2023 at 21:31, Andy Goryachev 
> <andy.goryachev at oracle.com> wrote:
>
>     Please create a ticket, Florian.  Would it be possible to profile
>     the application when scrolling?
>
>     Thank you
>
>     -andy
>
>     *From: *openjfx-dev <openjfx-dev-retn at openjdk.org> on behalf of
>     Florian Kirmaier <florian.kirmaier at gmail.com>
>     *Date: *Friday, October 27, 2023 at 04:20
>     *To: *openjfx-dev at openjdk.java.net <openjfx-dev at openjdk.java.net>
>     *Subject: *Performance Regression in 21 - CSS
>
>     Hi everyone,
>
>     I've noticed that some parts of one of my applications is
>     significantly slower with 21. It's fast with 20.
>     The application heavily uses (and reuses) TextFlow with a Cell
>     pattern.
>     When I scroll, it is smooth with 20, but has big freezes with 21.
>
>     I've tried all the commits that happened in between, and
>     pin-pointed it down to the following:
>     ticket: https://bugs.openjdk.org/browse/JDK-8304959
>     PR: https://github.com/openjdk/jfx/pull/1070
>     commit:
>     https://github.com/openjdk/jfx21u/commit/3fa02ee96a6dadbc20cacbf399a2d65df708eee1
>
>
>     According to the description and the discussion in the PR - this
>     wasn't supposed to change any performance.
>     Is this regression known?
>     Otherwise, I should create a ticket for it.
>
>     Greetings Florian
>
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