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  • Oh, just noticed - I did a count(*) in one of the big tables (213+ Million records). v10.1 -- took approx 22 seconds. v10.11 (slave_parallel_threads) -- took approx 52 seconds. Both slaves gets the same amount of traffic and are in sync with master. Commented Mar 15 at 4:47
  • I removed the mysql tag from this question. Please be aware that MySQL and MariaDB are no longer compatible, and you should think of them as entirely different products. Commented Mar 15 at 15:28