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In iOS, the minimum delay time when executing tasks is ensured by the dispatch mechanism that uses Dispatch Queues from Grand Central Dispatch (GCD).

For minimal delay, the following are typically used:

  • Main Dispatch Queue — for tasks related to updating the user interface, executed on the main thread.
  • Concurrent Dispatch Queues with high priority (QoS) — for background tasks requiring quick response.

Example of creating and using a high-priority queue:

let queue = DispatchQueue.global(qos: .userInitiated)
queue.async {
    // Fast execution of the task
}

Using GCD allows efficient management of threads and minimizes delays in task execution.