What's the difference between utf8_general_ci and utf8_unicode_ci?

Question

Between utf8_general_ci and utf8_unicode_ci, are there any differences in terms of performance?

Answer 1

According to this post, there is a considerably large performance benefit on MySQL 5.7 when using utf8mb4_general_ci in stead of utf8mb4_unicode_ci: https://www.percona.com/blog/2019/02/27/charset-and-collation-settings-impact-on-mysql-performance/