Hi, I'm a noob in the FreeBSD world but I like it. If I just add this line to /etc/make.conf Code: CPUTYPE?= native Then gcc will set -march=native and -O2 right? Is this simple tuning option enough for a decent output code? May I set -O3? I'm confused because some books I've read said that using -03 will break some ports and the compiler sometimes doesn't detect the right processor, but they were written two or three years ago. Thank you, English is not my first language.