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Utterly false. I build locally all the time to make sure that the thing works before I commit the code.

Do you wait around for a 30 minute build with a coffee rather than do something else useful? If not, then you don't need mold.

Do you not have automated unit and integration testing?

Do you not have code review and CI before code lands?

Do you not have distributed, cached, incremental builds?

If I’m developing a feature, I run the newly written unit tests locally. If I have a CI failure, the first step in debugging is to reproduce the failing test locally.

Improving build time isn’t just about changing 30-minute builds to 30-second builds, but also about changing 30-second builds into 2-second builds.

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