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When running tests in parallel, CTest runs the tests in decreasing order of cost (time required), to get the largest speed up from parallelism. However, the initial cost estimates for all tests are 0, and they are only updated after a test run. This works on a dev machine, where the tests are ran over and over again, because eventually the estimates become quite precise, but CI always does a clean build with 0 estimates. Because we have 2 slow tests, we want them to run first to avoid losing parallelism. To do this, we provide them with a cost estimate manually.