I'd imagine it would be a benefit where, let's say, every project has `byteorder` in its dependency tree somewhere. If you had a local, stateful, build server t

I'd imagine it would be a benefit where, let's say, every project has `byteorder` in its dependency tree somewhere. If you had a local, stateful, build server that processes every build on your machine, you could re-use the object file from the last time you compiled that library regardless of if it was for this project or not. That's probably not a big gain for just `byteorder`, but if you multiply that by many libs or take into account some of the much bigger ones it could make quite a difference in build time. Even "first" build time for new projects you're building. IIRC, some group in mozilla has already has something working that works like ccache that works (or rewrote ccache to work) with compiling rust. (Which I think is what steveklabnik is alluding to in his neighboring comment.) Although I guess that might only work within a single code base, not sure about that.