While you make invoke to control from many many threads , the UI will hang

avoid_hang_UI.cs

  internal class AvoidHang : IDisposable
    {
        private readonly SemaphoreSlim _semaphore = new System.Threading.SemaphoreSlim(1, 1);

        public void Dispose()
        {
            _semaphore.Dispose();
        }

        public void ToAvoidHang(int fast = 1000, Action action = null)
        {
            lock (this)
            {
                if (_semaphore.CurrentCount != 1) return;
                _semaphore.Wait();
                action?.Invoke();
                (new Thread(() =>
                {
                    Thread.Sleep(fast);
                    try
                    {
                        if (_semaphore.CurrentCount == 0)
                            _semaphore.Release();
                    }
                    catch (Exception)
                    {
                        // ignored
                    }
                })).Start();
            }
        }
    }