Factorio Forums

Problem:
Migration scripts updating existing surface(s) to new biomes, e.g. when adding alien biomes mid game or updating to a new map generator, take a lot of memory when generating temporary surfaces as deleting chunks will only happen after they complete.

Suggestion:
Add a method similar to force_generate_chunk_requests() for chunk deletion to forcefully purge chunks within the same tick.
This method could be limited to work only within migration scripts if it'd cause issues in control phase.

Sorry but this isn't going to happen. Nothing in the game logic assumes chunks can be invalidated during a tick so literally every place that touches them would have to be guarded against the possibility that one disappears during any Lua call and that's just not going to happen.