Feature Request

Summary

In secret connection we use sync.Pool's for some 1024 byte buffers. However these buffers are only ever needed locally within the same thread, so this is a wasted synchronization primitive that does cost us. All reads and writes in secret connection are under a mutex, so we should just make a new buffer in each secret conn struct.

Impact is ~8% of the current secret connection read time (Get and Put in following pprof):

Problem Definition

Slight speedup to secret conn