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This change adds a paragraph to the documentation regarding "userlists" and the use of hashed password value. It indicates what a user can do to address the high CPU cost of having to calculate the hash at each request, such as reducing the number of rounds or the cost complexity, if the algorithm allows for it. I believe it is necessary to mention how the musl C library impacts performance of hashing functions, as this has already led to a few issues: https://github.com/haproxy/haproxy/issues/1298 https://github.com/haproxy/haproxy/issues/2008 https://github.com/haproxy/haproxy/issues/2251 The performance impact is significant enough to mention it. Acked-by: Lukas Tribus <lukas@ltri.eu>