If you model your gradle (or bazel, or maven, or sbt) project as many smaller sub-projects, then the build tool can run a pool of compiler processes in parallel

If you model your gradle (or bazel, or maven, or sbt) project as many smaller sub-projects, then the build tool can run a pool of compiler processes in parallel. In the case above, the repo I compiled was broken down into 200 gradle sub-projects. Bazel builds tend to be finer-grained still. Also gradle 6.5 fixes a scala compilation performance regression that was introduced in gradle 6: https://github.com/gradle/gradle/issues/12591 https://github.com/gradle/gradle/issues/12591