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« on: February 01, 2018, 03:02:27 am »
Just a shot in the dark, but how does system resource usage look like when the application hangs (especially RAM)?
Might be that df runs out of physical memory (certainly possible for very large worlds), and either starts swapping (what will slow it down to a near halt), or just have allocations fail (if memory is allocated as non-pageable), what could, depending on how (if) those errors are handled, lead to all kinds of crazy behaviour.
Also, as Shonai_Dweller said, if you're using a 32bit build, you're very likely at the address space limit (which is 4 GB for 32bit applications on 64bit Linux, and less on all other platforms - I don't remember the numbers by heart).
If you're certain that the game is far from using all your resources, it might be worth reporting this as a bug on the official bug tracker, as it seems reproducible.