A larger pool actually makes the number worse because it adds more contention. I tested it with 64 and all the results were worse. The last example which was 34

A larger pool actually makes the number worse because it adds more contention. I tested it with 64 and all the results were worse. The last example which was 348 TPS drops to 164 TPS! Tangentially I also highly recommend this article on pool sizing. https://github.com/brettwooldridge/HikariCP/wiki/About-Pool-Sizing https://github.com/brettwooldridge/HikariCP/wiki/About-Pool-...