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The dispatch type with the greatest delay in task processing is deferred dispatch.

In iOS and other systems, task dispatching can be:

  • Immediate — the task starts immediately after being enqueued.
  • Deferred — the task is placed in a queue and executed later, when the system is free.
  • Periodic or with a timer — the task is scheduled to start according to a timetable.

Deferred dispatch is characterized by the longest delay, as the task can wait in the queue for an indefinite time until the conditions for its execution are met.

Example: using DispatchQueue.main.asyncAfter in GCD delays the execution of the task for a specified time, increasing latency compared to immediate start.