DropShadow effect kills gfx responsiveness OS-wide

Nir Lisker nlisker at gmail.com
Sun Nov 4 19:22:53 UTC 2018

> I don't have access to the OpenJDK bug tracker so I can't file a bug
> report for this

You can do it at https://bugreport.java.com/bugreport/

On Sun, Nov 4, 2018 at 9:18 PM Mike Hearn <mike at plan99.net> wrote:

> I'm on macOS High Sierra with a very new and very high end MacBook Pro.
> I have a pretty basic GUI that uses translucency fairly aggressively. I
> added a DropShadow effect to some nodes, which looks great, but to my great
> surprise this one line of code kills the UI performance not of my app, but
> other apps on the same machine, specifically:
>    - I can see the frame rate of the dock's zoom animation is lower
>    - Chrome becomes nearly unusable. Opening a new tab goes from nearly
>    instant to sluggish, this is very noticeable if you watch the tab in the
>    tab strip itself expand. It goes from smooth and fast to being able to
> see
>    the individual frames.
> Stopping my app immediately restores the other apps to full framerate. So
> presumably, the DropShadow shader is triggering some slow path not only in
> JavaFX but the GPU or driver itself. I've experimenting with caching and
> that speeds up scrolling of nodes with drop shadows in my own app, but the
> OS-wide slowdown remains.
> Has anyone seen anything like this before? I'm suspecting that I'll need to
> render my own drop shadow effect using static bitmaps to work around it.
> I don't have access to the OpenJDK bug tracker so I can't file a bug report
> for this and I'm not sure how to reproduce it reliably. It's the first time
> I noticed it.

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