Rust-lang for HFT's

Me and my brother have started programming for our own Hight Frequency trading firm that we are starting by ourselves.
He is a very senior C++ developer with a lot of experience in the HFT field. I have 3 years of experience in python backend and 1 year of experience recently in Rust (Companu greenfield projects)

While he is making everything in C++ I am allowed to build the same functionality in Rust with him reviewing my implementations for speed tweaks and benchmarking.

I was wondering if the effort of trying out Rust here is futile because while they say both languages are nearly the same I feel that the last nanoseconds of performance might be harder to squeeze out of Rust making this effort futile.
In which case I would rather brush up my C++ and get with him on it.