Few large graphs vs many small graphs

Hello, I’m making a 2D project that’s set up so that there are large main areas, and each area is broken up into smaller, separate scenes in Unity.

I am currently using grid graphs for all NPCs, and I’m wondering about which is better practice for performance: lesser, larger graphs (graph per main area) or greater, smaller graphs (graph per scene) to cover everything?

Usually a single large graph is the recommended setup. Unless you end up with vast amounts of empty space between them.

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