swift-concurrency-6-2

To migrate your Swift project to the 6.2 concurrency model safely, enable MainActor default inference and incrementally migrate critical paths to ensure async work remains on the caller's actor while eliminating data races.

MainActor default inference in Swift 6.2 is an approachable concurrency setting where code runs single-threaded by default on the main actor, eliminating common data-race errors without sacrificing performance.

You offload CPU-intensive tasks in Swift 6.2 by using explicit @concurrent patterns, which selectively introduce background concurrency while keeping default async work on the caller's actor to prevent data races.

Yes, you can adopt Swift 6.2 concurrency from Swift 5.x by using the provided migration guidance to turn on approachable concurrency settings and incrementally update your codebase to support isolated conformances and MainActor-based architectures.

Swift 6.2 defaults to single-threaded execution for async work to eliminate common data-race errors by keeping operations on the caller's actor, ensuring that concurrency is introduced explicitly only when needed for CPU-heavy tasks.

The limitation of MainActor-based architectures is that defaulting to single-threaded execution can bottleneck CPU-intensive work, requiring explicit @concurrent patterns to selectively offload background tasks without introducing data races.