Github user tabish121 commented on the issue:
    @franz1981 @clebertsuconic I've sent an alternate PR #1928 which performs 
the send without any buffer copy unless necessary due to message redelivery or 
existence of original delivery annotations.  Proton will be copying those bytes 
anyway so an intermediate isn't really needed on the common path.  
    It could be argued that you could further change things beyond what I did 
and just keep a single ReadableBuffer instance around in the consumer and give 
it the outbound buffer to send as the proton send method will take that 
readable buffer and call get(array, offset, length) on it to get a copy which 
means netty should perform the most efficient write.  


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