WCF服务 - 消息/对象大小相关

I have wcf service (S1) as client and another Wcf service(S2) as server. S1 consume S2 over net.tcp. S2 has one operation, which return a complex object with most of it's contents are string. The average size of this object is between 7-8 MB.I have wcf service (S1) as client and another W