Not who you’re replying to, but this is great context, and I want to thank you for including it. As another heavy async user (for a network service that handles loads of requests and does loads of DB reads and writes), I am also a big fan of Rust’s async at scale. We’re currently in the process of seeing where we can get rid of async_trait with 1.75, which has not been particularly drop-in in many cases but which is still exciting.
Anyway, I have been meaning to try out nextest for our big honking monorepo workspace at work. The cargo test runner has always been essentially fine for our needs, but speeding up test execution in CI could be a huge win for us.