我正在测试一个涉及信号量lim的方法，以便在事件发生时发出通知。它按预期工作，但我注意到，如果我在应用程序启动的前几秒钟内使用它，在信号量释放和代码继续等待信号量之间会有很大的延迟。

主要：

            var userIntentProvider = new UserIntentProvider();

            Console.WriteLine("started");

            
            Task.Run(() =>
            {
                Console.WriteLine("starting");
                //wait for an event to be added.
                userIntentProvider.GetNextUserIntentAsync().Wait();
            });


            while (true)
            {
                var input = Console.ReadLine();
                //add the event
                userIntentProvider.AddUserIntent("bar");
            }

类：

        public void AddUserIntent(string userIntent)
        {
            NewUserIntent?.Invoke(this, userIntent);
        }


        public async Task GetNextUserIntentAsync(CancellationToken token = new CancellationToken())
        {
            var sw = new Stopwatch();
            //create signal
            var signal = new SemaphoreSlim(0, 1);

            //create event handler
            EventHandler<string> eventHandler = null;
            eventHandler = (sender, e) =>
            {
                NewUserIntent -= eventHandler;
                
                
                signal.Release(); //THE SEMAPHORE IS RELEASED AND THE STOPWATCH STARTED
                sw.Start();
            };

            //wrap in try catch to force removal of event
            try
            {
                //subscribe
                NewUserIntent += eventHandler;

                // wait for signal 
                await signal.WaitAsync();//THE SEMAPHORE IS WAITED ON AND THE STOPWATCH STOPPED
                sw.Stop();
                Console.WriteLine("done" + sw.ElapsedMilliseconds);
            }
            finally
            {
                NewUserIntent -= eventHandler;
            }
        }

Stopwatch测量Release（）和waitAsync（）调用之间的时间最长可达1.5s。如果我在启动应用程序后等待几秒钟，然后触发这个机制，秒表报告0ms已经过去了（更像我所期待的），是什么导致了这种延迟？