DropShadow effect kills gfx responsiveness OS-wide

Tom Schindl tom.schindl at bestsolution.at
Sun Nov 4 19:48:09 UTC 2018

I've never seen and don't see it slowing down other applications (I'm on
a MacBook Pro 13'') but I reported the DropShadow slow down and
documented the solution [1].



On 04.11.18 20:22, Nir Lisker wrote:
>> 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.

Tom Schindl, CTO
BestSolution.at EDV Systemhaus GmbH
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