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1. Add a script to generate a sorted list of most costly tests. A tests' cost is roughly `runtime% / number of edits`. A slow test that's only been updated once is much less valuable than a slow test that has been updated 20 times: the latter test is catching more changes in the type system. 2. Check in the results of running this script. I want to make the skipping behaviour deterministic and the same for everybody, even though you may get slightly better performance by examining only *your* test changes. 3. Add code to skip tests until it reaches a 5% chance of missing an edit. Right now this provides a 38% speedup. Still not done: 4. Make this value configurable. 5. Make the CI configuration specify a 0% chance of missing an edit.