Due to an apparent merge error by the FXD team (about 2 weeks ago), Decora-JOGL.jar is no longer on the runtime classpath, which means that we're not getting GPU-accelerated effects on Mac OS X like we're supposed to (see RT-1691). The change in question is here:
http://jfxsrc.sfbay.sun.com/javafx/franca/integration/jfx/diff/ba1e4340eaa0/desktop.properties

So for the past two weeks, no one has actually been testing the new Decora-JOGL backend on Mac OS X.

To make matters worse, we're now discovering (with recent runs of the FXTester suite) that the Decora-JOGL backend has high overhead for small-sized nodes (e.g. 128x128 or less) and can be slower than the Decora-SSE backend in these cases. I will file a separate bug report for this issue.