Async Task <actionresult> vs AsyncTask MVC Controller for Long operations

Question

使用Ajax调用对公共MVC方法的调用。

    Dart.LoadProfile.DetailProfileLoad = function (url) {
    $.ajax({
        url: url,
        type: 'POST',
        data: null,
        xhrFields: {
            withCredentials: true,
        },
        success: function (data) {
            //get JSON data from response
            jQuery.each(data, function (index, itemData) {
                //Code here to display result
            });
        },
        error: function (jqXHR, ajaxSettings, thrownError) {
            console.log(thrownError);
        },
    });

};

1. 非异步

       [HttpPost]
   [AllowAnonymous]
   public ActionResult GeneralLoadProfileResult(long fid, long uniqueId, string loadyear)
   {
       try
       {     
           //Code here. Average 1 - 1.5 min to compelte calculation 
   
          return Json(new { result = txLoadReport });
       }
       catch (Exception)
       {
           throw;
       }
   }
   

2. 异步

       [HttpPost]
   [AllowAnonymous]
   public async Task<ActionResult> GeneralLoadProfileResult(long fid, long uniqueId, string loadyear)
   {
       try
       {
   
           return await Task.Run<ActionResult>(() =>
           {
               //Code here. Average 1 - 1.5 min to compelte calculation
   
               return Json(new { result = txLoadReport });
   
           });
   
       }
   
       catch (Exception)
       {
           throw;
       }
   
   }
   

有人可以解释一下上面提供的样本中使用Async（如果有的话）的好处吗？进行异步与非异步调用会更有效率，即当多个用户同时发出相同的请求时？

谢谢。