Phoenix LiveView allows building real-time user interfaces without heavy JavaScript, but handling long-running tasks can freeze the UI.Offloading tasks to background processes in Elixir using concurrency patterns keeps LiveView responsive and scalable.Background workers, GenServers, and Phoenix PubSub are key components for offloading work and maintaining UI performance.Proper error handling, job tracking, and leveraging external services are crucial for designing responsive and scalable LiveView applications.