Mac OS X only supports 64-bit binaries. Prior to JavaFX 2.2 we used to ship fat binaries for all of our libraries that included both 32-bit (arch=i386) and 64-bit (arch=x86_64) binaries. This was fixed with RT-21423 by using "lipo" to strip out the 32-bit part, leaving only the 64-bit part, which cut the size of our shipping binaries in half.

In 3.0 we can optimize the builds of the native libraries by not even building the 32-bit libraries in the first place.