Saving large areas takes forever

[LudwikJaniuk]

I can scan areas the size of ~5 regular rooms, giving save times of 2-3 minutes, which is fine. However, as soon as I go beyond a certain size, it seems that the save keeps taking forever, and never completes (for an area the size of about ~7 regular rooms, I have let it keep going for over half an hour, still without the save completing

Why does ADF saving take so long? What is it doing? On one hand it feels like tango has somehow failed, since the save never completes, but on the other, the hardware does keep getting very hot (so it seems that it's working hard on something).