The history of low-concurrency performance regressions in MySQL 5.6, 5.7 and 5.8

(Mark Callaghan) What is a reasonable goal for performance regressions between major releases of MySQL (5.6, 5.7, 5.8)? Some regressions are expected because more features means longer code paths. But what if MySQL 5.7 and 5.8 only get 2/3 of the QPS versus MySQL 5.6 at low concurrency?

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