see attached example
outer.zul includes test.zul via databinding (src="@load(vm.src)")
depending of the depth in the markup hierarchy in test.zul the getters in the TestVM are called several times.
this happens from version 6.5.2.FL.20130307 or later (even latest 6.5.3 freshly)
in 6.5.2.FL.20130306 and below the getters are called only once as expected.
this may cause serious performance issues in morecomplex UIs ... even in this simple example the getters are called 4 and 7 times.