多线程等待结束事件

结果是：对1000条网页进行抓取，并显示抓取后的结果，比如哪些能抓取，哪些没有关键字之类。String[] webSites= ...
for(int i = 0 ; i <1000 ; i++)
{
MyFunc(webSites[i]);
}
public void MyFunc(string website)
{
 WebRequest wRequestUTF = WebRequest.Create(website);
 ......(就是获取网页的内容)
}
这个for循环执行的时候太长，想缩短时间，
这种改成多进程 是否有作用？
比如我把长度为1000的数组分成10个长度为100的数据
然后用10个进程去执行这个10个数组对应的函数
大概如下 thread1 = new Thread(new ParameterizedThreadStart(this.Exec));
                thread2 = new Thread(new ParameterizedThreadStart(this.Exec));
                thread3 = new Thread(new ParameterizedThreadStart(this.Exec));
                thread4 = new Thread(new ParameterizedThreadStart(this.Exec));
                thread5 = new Thread(new ParameterizedThreadStart(this.Exec));
                thread6 = new Thread(new ParameterizedThreadStart(this.Exec));
                thread7 = new Thread(new ParameterizedThreadStart(this.Exec));
                thread8 = new Thread(new ParameterizedThreadStart(this.Exec));
                thread9 = new Thread(new ParameterizedThreadStart(this.Exec));
                thread10 = new Thread(new ParameterizedThreadStart(this.Exec));                thread1.Start(os[0]);
                thread2.Start(os[1]);
                thread3.Start(os[2]);
                thread4.Start(os[3]);
                thread5.Start(os[4]);
                thread6.Start(os[5]);
                thread7.Start(os[6]);
                thread8.Start(os[7]);
                thread9.Start(os[8]);
                thread10.Start(os[9]);为了显示执行完后的报告
我加了
                thread1.Join();
                thread2.Join();
                thread3.Join();
                thread4.Join();
                thread5.Join();
                thread6.Join();
                thread7.Join();
                thread8.Join();
                thread9.Join();
                thread10.Join();但是我觉得用了Join后，跟不用线程处理，时间好像是一样的？