Using JSON to send data around is pretty flexibel but it comes with the cost of parsing and generating lots of garbage in the client. Also, a JSON file is much bigger (in bytes) than the actual data it transfers.
A nice alternative is Protobuf:
https://developers.google.com/protocol-buffers/
If implemented, this support would increase transfer speed, reduce garbage in the games that use Playfab and improve development, as there would be no JSON parsing.
Thanks!
