For diagnosing build speed, one thing I find helpful is trimming N messages down to 1-2 per command. e.g., if you spawn a process, don't emit "created process",

For diagnosing build speed, one thing I find helpful is trimming N messages down to 1-2 per command. e.g., if you spawn a process, don't emit "created process", "started process", "shutting down process", "initializing process", "terminated process"... while they all seem useful, just including one of them (like "started process") can trim things down significantly with negligible effect on the usability. I can't speak the same for your use case necessarily, but it might be worth spending a couple hours at some point looking into what you can trim. It's easy to feel the upfront time investment isn't worth it, but it really compounds on a daily basis for every single person, so it's nice if you can address it.