The objc test suite takes almost 40mins, which is several times more than other wrapped languages and more than twice as long as C++ (which has a really large test suite).

We are trying to deduce the test latency. MacOS test jobs are usually the last ones to finish on PRs, so speeding up ObjC is clearly an opportunity. What it is that takes so long about them? (I don't think it's the number of tests).

https://sponge.corp.google.com/target?id=62eec144-8d4c-4baa-95a2-12b93df40552&target=github/grpc/aggregate_tests&searchFor&show=ALL&sortBy=STATUS&sortMethodsBy=DURATION

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