You may have noticed that the OpenSSL 1.1.1 series will reach End of Life (EOL) next Monday...
Most sensible options are to switch to 3.0 or 3.1 as soon as possible.

But we also discovered that switching to OpenSSL 3.0 could led into big performance regressions...
so which version do we need to use?

I just published a blog article about this, and also how we tried to leverage any incompatibility issue within the mORMot OpenSSL layer:
https://blog.synopse.info/?post/2023/09/08/End-Of-Live-OpenSSL-1.1-vs-Slow-OpenSSL-3.0 