A package you install or a port you build will be identical. There is nothing in a compilation from a port that is "customized" for your particular computer, other than its basic hardware architecture.
Compiler flags may be set for particular architectures, in any particular ports' Makefile. But those settings are crafted by the port developer, not by a port builder. I've done that for ports I've developed. But that's to get those architectures working, not to "optimize" anything.
And if you like gcc optimizations, spend some time Googling gcc -O settings. My understanding is that they break more software than they help.
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