Currently saving battlescape takes an unacceptable amount of time because it saves arrays of 0's and 1's and shit, and resulting file takes like 50 megabytes even compressed.

Xml is not a good format for anything except small packs of human-modified data. It's definitly not to be used for:

• game saves (those containing things like map part lists, arrays of data etc.)
• game maps / tilesets / sectors
• voxel maps​

We should figure out a new way to store stuff so that save/load times become acceptable at the very least