Can’t submit ODK form - endless loading rectangle (hanging when submit button is pressed)

That suggests there is also a performance-related issue, then. The hanging at submit time is definitely a crash, though.

This is surprisingly hard to give a definite answer to. It depends heavily on the types of computations the form has, level of nesting, and device performance. We know there are bugs and performance issues with nested repeats in particular and are actively working to resolve them.

The ODK team currently maintains Enketo.