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Does anyone have experience with making a spring/micronaut service (preferably grpc) async using coroutines?  My immediate problem is I'm not sure the best way to even test if I'm doing it right.  I can fake an IO delay with Thread.sleep or coroutines delay() then run an integration test that makes a bunch of concurrent requests, which I did but takes the same amount of time as before converting everything to be async.  I figure there are some server config settings like # of connections or threads, or maybe my test itself is the problem.