Hub.cs

public class Chat : Hub 
  {
      public void LoadPlotData()
      {
          ThreadPool.QueueUserWorkItem(x => {
                var firstPlotData = Db.LoadFirstPlotData();
                Clients.Caller.firstPlotDataRetrieved(firstPlotData);
            });
            
          ThreadPool.QueueUserWorkItem(x => {
                var secondPlotData = Db.LoadSecondPlotData();
                Clients.Caller.secondPlotDataRetrieved(secondPlotData);
            });
      }
      
      public void LoadTableData()
      {
          ThreadPool.QueueUserWorkItem(x => {
                var firstTableData = Db.LoadFirstTableData();
                Clients.Caller.firstTableDataRetrieved(firstTableData);
            });
            
          ThreadPool.QueueUserWorkItem(x => {
                var secondTableData = Db.LoadFirstTableData();
                Clients.Caller.secondTableDataRetrieved(secondTableData);
            });
      }
  }