Call SSIS package in C#

I need to call a SSIS package in a web application to import access data into SQL Server. However, I discover the performance is extremely low. And I don't know it's my personal problem or common issue. If possible, don't use it.

Package package = null;
DTSExecResult result;

//connection manager
package = new Application().LoadPackage(packagePath + "\\importData.dtsx", null);
package.Connections["rs"].ConnectionString = connectionStr;

//variable
Variables vars = package.Variables;
vars["TenderNumber"].Value = tenderNum;

result = package.Execute();

if (result == DTSExecResult.Failure)
{
    foreach (var e in package.Errors)
    {
        logHelper.Error("Package Execution Error", new Exception(e.Description));
    }

    throw new Exception(package.Errors[0].ToString());
}