Re: Why do users report a performance decline in 8.0?

[Bin Wang]

We have optimized for low-concurrency environments, achieving notable improvements in some cases, though these improvements are only significant in specific scenarios.

If anyone is interested in testing our optimized version of MySQL（https://github.com/advancedmysql/mysql）, they can see that even under low concurrency, the performance difference compared to 5.7 is not very significant when using BenchmarkSQL TPC-C tests on high-end NUMA machines; under high concurrency, it far exceeds 5.7.

MySQL 8.0 actually performs very well, but this can only be noticed on high-end machines and in cluster environments. It is not easily detected in typical SysBench single-machine tests.