// X is a number much bigger than 5
List<Task> tasks = new List<Task>();
for (int i=0; i<X; i++)
{

Task t = Task.Factory.StartNew(() => { requestFunc(url); },
                                   TaskCreationOptions.None);
t.Wait(100); //slow down 100 ms. I am not sure if this is the right thing to   do
tasks.Add(t);
}

Task.WaitAll(tasks);