Built-in Nodepool vs Custom Node Pool

Built-in Nodepool vs Custom Node Pool
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Does the built-in nodepool do special thing “behind the scene” to optimize performance of game?
I see it complicated to use, so Im using my custom node-pool implementation.

But I still wonder if the built-in nodepool has some magic power that I need to reconsider to use it?

You should continue to use NodePool to optimize games that use reuse nodes.
You can read the Node, NodePool-related code, and the documentation in the engine to understand this feature.

Thanks for your answer.
But the doc you gave me is too brief to answer my point:

Does built-in-nodePool has “low-level logic” to optimize the performance with node-reuse - or is it only a convenient tool? And if it does, how?