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Sysadmins slam Apple’s SSL/TLS cert lifespan cuts
(www.theregister.com)
This is a most excellent place for technology news and articles.
Well AWS ACM already automates this, so if the renewal period gets shortened, I'm guessing that this will be updated to suit, unless I'm misunderstanding your point.
I hadn't considered the CPU load, but that's a fair point. I'm guessing that a suitable piece of code will utilise specialised hardware, or perhaps leverage the GPU or just in time SSL certificates will become a thing.