OpenSSL 3.x introduced significant performance regressions compared to version 1.1.1, causing issues for high-volume deployments. After four years of improvements, OpenSSL 3.5.x has finally reached comparable performance to the older branch. Major Linux distributions like Debian 13, RHEL 10.1, and Ubuntu 26.04 LTS are adopting version 3.5.x for post-quantum cryptography support, making performance improvements critical as post-quantum algorithms already carry performance overhead.
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