[P5fRxh5kUvp2th]

"can't handle" here means "can't handle performantly".

Think of it like using the wrong data structure for the problem.

[daemin]

And not just for the game itself but for creating the world in the first place. Often you need radically different data structures for the creation and editing of the data as compared to what you need for running the game on player's machines.