Hello All, I'm implementing high performance network application and looking for the tutorial how to use boost asio library in _most_ efficient way. One part of application is TCP server/client. It should support SSL (if remote site supports SSL). Also it should support synchronous and asynchronous modes to write/read to/from socket to get best latency/throughput results (I'm not sure though if there any sense in synchronous mode). Another part is UDP client. It uses asynchronous IO. I noticed that null_buffers, shared_ptr make application slower. Are there other stuffs I should avoid? Thank you for assistance. Dima