I'll never understand why people insist on tinkering with their kernel... it's like a person rewiring their new cars electrical system an hour after purchasing it.
If you want a slightly faster boot time, use instead config(8), Any performance gains from customizing GENERIC will be *very* negligible.
Also, don't mess with the CFLAGS, while it's common practise for Linux users to add "optimizations", they're unnecessary and often *dangerous* when messed with.
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