Re:OpenSSL 4.1.0
by mrweasel on Friday October 23, 2026 @12:10PM
(#50211304)
We ran a number of tests, including sending a percentage of real traffic to endpoints running AWS-LC and Wolfssl. Technically yes, OpenSSL 3.X is slow, measurably so, but not enough that we wanted to deal with it. That's for our use case, I can easily imagine there being others, where maybe you have different hardware or way more traffic, where it would be worth while. For basic TLS termination in haproxy, it wasn't really worth it to us.
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It also depends on exactly which version of OpenSSL. We ran similar tests with multiple versions of openssl. Openssl 3.0, which was the version in the official packages of our LTS distro was unacceptably slow. With 3.4, it was still worse than 1.1.1 but the regression was an acceptable level.
It also definitely depends on your hardware, and how you use it. The main source of the performance regression is more lock contention, so it is more noticeable if you have more threads running on more cores.