I work on a large rust project professionally, and we have tried to make build times a priority for CI. I’m just noting a couple of things that helped us a lot,

I work on a large rust project professionally, and we have tried to make build times a priority for CI. I’m just noting a couple of things that helped us a lot, in case they’re useful. - sccache is pretty much essential - beefiness: GitLab’s default runners for example are way too underpowered and made our builds take like 30 minutes (as opposed to 5 on a beefy machine in CircleCI). We’re working on switching to self-hosted runners for GL - replacing diesel with sqlx saved us a fair bit of time - caching the cargo home can help. It wasn’t a massive gain relative to sccache, though. Similar story with caching the target directory - lld linking was another relatively small win, but a win nonetheless - splitting things up into smaller libraries and binaries (all in one workspace) helped us a fair bit, since building/testing some targets can now totally skip some libraries, but I imagine YMMV