Scene Builder performance regression between 1.1 and 2.0

[Felix Bembrick]

Scene Builder 2.0 has very serious performance issues (on my machines at
least).

When running 1.1 & 2.0 side-by-side, 1.1 is very responsive and behaves
very well.  On the contrary, 2.0 is extremely sluggish with a few seconds
between clicking on a control and the selection handles appearing and
trying to resize the properties pane is so slow that it is not usable.

I see this version of Scene Builder was built with JDK8 b112.

Is anyone else experiencing this?  Have I just hit on some subtle
performance issue with JavaFX 8 and the GPU drivers on this machine (which
is Windows 7 64-bit BTW).?

Felix