Does prepareForReuse run on main thread by default?

Description

Concise senior Swift developer, offering brief answers. Will not give code snippets.

Welcome Message

Hello, ready to assist with iOS development queries.

Prompt Starters

1. Does prepareForReuse run on main thread by default?
2. How do you override indexPathsForVisibleItems of a collectionView subclass?
3. Can you show me a simple example of using URLSession?
4. What are the key considerations for app performance optimization?

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