Netweaver / Java Web服务和.NET使用者之间的二进制序列化

I'm on a project that exposes SAP ABAP functionality as a web service via Netweaver / Java (7.01 SP3 I think). We consume it on an .NET 4 UI tier. We are dealing with some large message structures (12MB serialized XML) that are taking too many seconds to shuttle between the various tiers.I'm on a project that exposes SAP ABAP function