“Sub-100ms response times, because I chose the hard path with Rust and it paid off.“
Rust is not the reason you have sub-100ms response times. If it were the true bottleneck your app would be far faster than this
It sounds like they're talking about HTTP requests/responses, then that sounds mostly like just networking overhead, and it wouldn't matter if it was JS/Go/Rust or C++, network latency would be there anyways. And if that's with network latency excluded, just hitting localhost, then that sounds horrible, should easily be below 1ms unless you're doing something heavy, but sounds like a typical application with no such actions.
120K lines of Rust and several thousand transient dependencies with a few million lines of code.