I think that the scene graph marks all bits dirty for a new node when in fact it should be selective about this.
For example the default stroke on a shape is null. But create any shape node: circle, rectangle, text, and
you'll see the scene graph creates a BasicStroke and sets it on the NGShape.
This is a lot of wasted work if strokes aren't wanted, as is likely to be the case for almost all text nodes,
and Jasper guesses that fill is the most common in general.

I overrode geometryChanged in NGRectangle to do a dump stack and ran the attached program and
you can see that this occurs regardless of not setting a stroke :

C:\fx2tests>c:\jdk1.7\bin\java -cp c:\fx2\jfx\artifacts\sdk\rt\lib\jfxrt.jar;.
 NoStrokeTest
java.lang.Exception: Stack trace
        at java.lang.Thread.dumpStack(Thread.java:1342)
        at com.sun.javafx.sg.prism.NGRectangle.geometryChanged(NGRectangle.java:43)
        at com.sun.javafx.sg.prism.NGShape.setDrawStroke(NGShape.java:114)
        at javafx.scene.shape.Shape.updatePGShape(Shape.java:851)
        at javafx.scene.shape.Shape.impl_updatePG(Shape.java:914)
        at javafx.scene.shape.Rectangle.impl_updatePG(Rectangle.java:550)
        at javafx.scene.Node.impl_syncPGNode(Node.java:452)
        at javafx.scene.Scene$ScenePulseListener.syncAll(Scene.java:1775)
        at javafx.scene.Scene$ScenePulseListener.syncAll(Scene.java:1784)
        at javafx.scene.Scene$ScenePulseListener.synchronizeSceneNodes(Scene.java:1737)
        at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:1860)
        at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:357)
        at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:458)
        at com.sun.javafx.tk.quantum.QuantumToolkit$8.run(QuantumToolkit.java:325)
        at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
        at com.sun.glass.ui.win.WinApplication$2$1.run(WinApplication.java:62)
        at java.lang.Thread.run(Thread.java:722)