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If you're running a really old version of Linux, you're probably giving up on many-many performance optimizations.

> I find this outrageous because not all servers run 5.10 and a majority of them are still using long-running branches on 4.x

I don't think it's outrageous to ask people to upgrade 5.10. This was released over 1.5 year ago and there's no reason why your corporate overload shouldn't consider migrating to this, or at least have someone working on qualifying their workloads.