So... always use `-O0 -march=i586`, because using obvious optimizations for your hardware is a total waste of time and will definitely never ever be beneficial? Seriously, I get that it's possible to go off the deep end over optimizing, but that site is way off the deep end in the opposite direction.

I'm sure it was just poking fun. We can't be kernel ricers and get mad when people make fun of it. CFLAGS matter! lol

One thing I will say, compiling your own has many benefits, as all the distribution kernels use Generic x86-64 and miss out on all the Intel/AMD optimizations.

For example, just by switching from "Generic-x86-64" to "Core 2 or newer" in Processor type and features -> Processor family in kernel config, adds these 5 optimizations:

CONFIG_X86_INTERNODE_CACHE_SHIFT=6

CONFIG_X86_L1_CACHE_SHIFT=6

CONFIG_X86_INTEL_USERCOPY=y

CONFIG_X86_USE_PPRO_CHECKSUM=y

CONFIG_X86_P6_NOP=y

You can say it's pulling hairs, but hey, that's what I want. Not many people have the time, know-how, run Linux, etc. to be able to make these optimizations.