经常听见有人说用Windows 7玩网络游戏的时候网络延时比较高，也就是ping比平时xp的时候高一点，一直找不到原因，很苦恼。今天我们终于找到理由了，本来是Win7的一个服务在作怪，这个服务叫：Multimedia Class Scheduler，

这个服务的官方说明是：

The Multimedia Class Scheduler service (MMCss) enables multimedia applications to ensure that their time-sensitive processing receives prioritized Access to 中央处理器 resources. This service enables multimedia applications to utilize as much of the 中央处理器 as possible without denying 中央处理器 resources to lower-priority applications.
MMCss uses information stored in the registry to identify supported tasks and determine the relative priority of threads performing these tasks. Each thread that is p