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> and lastly: test, profile, test and profile again!

This, this and this. I see so much code where threading and caching are thrown around as a solution to a performance and no one ever tests to see if it's actually an improvement. I saw one the other day that used multiple threads to call a micro service which locked execution to a single caller and most of the bottleneck was serialization/deserialization. Making the microservice a library would have been much more performant.




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