Test run with OpenGL :
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java -Dsun.java2d.metal=false -Dsun.java2d.uiScale=2.0 -jar dist/RenderPerfTest.jar testImgBubbles

Result :
metalEnabled=0
Image : 58.36 FPS

Test run with Metal :
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java -Dsun.java2d.metal=true -Dsun.java2d.uiScale=2.0 -jar dist/RenderPerfTest.jar testImgBubbles

Result :
metalEnabled=1
Image : 28.56 FPS