Yea... i'm a huge fan of Rust and it is my primary language these days, but despite my many complaints with Go.. it's not bad. In fact it's pretty solid. I can't imagine the primary slowness in ipfs-go will be solved by ipfs-rust, at least on language alone. Some, sure, but not primary.. i would think.
Do i think Rust could have a better, more generic library with code that is far more concise than Go? Yes.. but that's not likely the cause for ipfs-go's issues.
I can definitely see a chance for a rewrite producing better code though. As much as i'd love to give Rust that victory, i just can't imagine Rust is _that_ big of contributor in this specific case.