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Compression put 31× fewer bytes on the wire and made the request 27 seconds slower.
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When twenty operations run billions of times and none of them is hot, a flame graph tells you about HashMap and nothing you can act on.
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An in-memory graph is fast until you need to write to it.
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Recursive CTEs hit an O(b^D) wall, and no amount of indexing or tuning moves it.
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One line went missing from a system prompt and the classifier started returning markdown instead of an enum.
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Ports and adapters is usually sold as a way to separate business logic from technical details.
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Hundreds of indistinguishable val id: Int properties, and one swapped argument is a security breach.
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Type-safe DSL syntax and runtime flexibility usually pull in opposite directions.
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Runtime bytecode manipulation can't turn an int into an Int, and Kotlin's null-safety metadata is gone by then anyway.
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A HashSet with 100 million entries takes 5 GB.