What is the best way to send a series of bytes using Photon with minimal overhead?

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Hi,

I want to minimise the data I am sending over the network. I can pack my data down into bits and bytes and unpack on the client to keep my messages small as I know exactly the format they need to be in and the order of the bits/bytes.

I am sending data via PhotonNetwork.RaiseEvent and I am wondering what is the best way to pack the data into the eventContent object to minimize overhead. I was told that Photon packs a byte per value added but this may only be for the PhotonStream.

What is best practice for sending data with minimal overhead?