This is a gruelling summary of all the things wrong with OpenSSL
I've mostly watched this whole thing from the sidelines, but was also affected noting that private key parsing suddenly became 70 times slower. I think they've now improved it to "only" be 10-20 times slower, and there does not seem any effort to work on it any more.

HAProxy Technologies
The State of SSL Stacks
The SSL landscape has shifted dramatically. In this paper, we examine OpenSSL 3.x, BoringSSL, LibreSSL, WolfSSL, and AWS-LC with HAProxy.