Oh one fun bit: I was able to get about `0.70 ms` total round trip RPC calls using an [STM Nucleo H745ZI board](https://www.mouser.com/ProductDetail/STMicroelectronics/NUCLEO-H745ZI-Q?qs=%2B6g0mu59x7JZtCCSR0CW2g%3D%3D)! Note that it's on a local switch and the raw ping time averages about `0.3 ms`.
It's running Zephyr and Nim and modified version of Status-IM's JSON-RPC using MsgPack. There's plenty of room for optimization. :-)
