[frsyuki]

There are binary-based serialization formats such as MessagePack [1] or BSON [2] that doesn't need escapeing overhead.

You can simply replace JSON with MessagePack since MessagePack is compatible with JSON.

[1] Why Not MessagePack? http://blog.andrewvc.com/why-arent-you-using-messagepack

[2] Performant Entity Serialization: BSON vs MessagePack (vs JSON) http://stackoverflow.com/questions/6355497/performant-entity...

[simonw]

Because using a binary format prevents you from tailing your log file without additional tools.