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Investigate why V2 test runner is slower than V1 #7795
When changing our CI from V1 to V2 for unit tests, performance goes from about 25 minutes to 40 minutes. Why is this?
Even though remoting will likely make the end result be significantly faster, non-remoting should not be taking this much longer and we are likely missing several optimizations.
See #7724 (comment) and the comments below it for some hypotheses.