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Re: utf8 and utf8mb4 performance difference
Posted by: hua kai
Date: September 18, 2016 12:20AM

https://dev.mysql.com/doc/refman/5.6/en/charset-unicode-conversion.html

The following items summarize other potential areas of incompatibility:

Performance of 4-byte UTF-8 (utf8mb4) is slower than for 3-byte UTF-8 (utf8). To avoid this penalty, continue to use utf8.

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