This proposal from the High Performance Working Group entails the use Google Protocol Buffers (GPB) to produce fast and compact encodings of FIX messages.
The use of GPB is one of the three major approaches to the efficient encoding of FIX that have been developed and are being proposed by the High Performance Working Group; the others being the use of FIX-specific binary encoding called Simple Binary Encoding (SBE) and encoding FIX using Abstract Syntax Notation 1 (ASN.1).
Discussion on Encoding FIX using Google Protocol Buffers may be found on the FPL Discussion Forum in the General Q&A category using the tag “gpb”.
More information on the work from the High Performance Working Group can be found here.
The proposed technical standard for Encoding FIX using Google Protocol Buffers is following the technical standards review process described in the document found here.