Subscriber block Observable

Rx observable waits for each subscribe to process in single threaded fashion. So Blocking happens

            var obs = System.Reactive.Linq.Observable.Range(0, 200, System.Reactive.Concurrency.Scheduler.TaskPool).Publish();
            obs.Timestamp().Select(i => i).
            Subscribe(i => { Console.WriteLine("sub1 block " + i); Thread.Sleep(3000); });

            obs.Timestamp().Select(i => i).
Subscribe(i => { Console.WriteLine("sub2  " + i); });
            obs.Connect();

            Console.ReadLine();