The CFLAGS and CXXFLAGS variables define the optimization flags for the gcc C and C++ compiler respectively. Although we define those generally here, you will only have maximum performance if you optimize these flags for each program separately. The reason for this is because every program is different.
In make.conf you should define the optimization flags you think will make your system the most responsive generally. Don't place experimental settings in this variable; too much optimization can make programs behave bad (crash, or even worse, malfunction).
We will not explain all possible optimization options. If you want to know them all, read the GNU Online Manual(s) or the gcc info page (info gcc -- only works on a working Linux system). The make.conf.example file itself also contains lots of examples and information; don't forget to read it too.
A first setting is the -march= flag, which specifies the name of the target architecture. Possible options are described in the make.conf.example file (as comments). For instance, for the x86 Athlon XP architecture:
Se svou distribuci windows jsem se seznamil pri koupi noveho pc (byl jsem mlady a znal z 486DX4 jen win a dos ;), s distribucemi linuxu jsem se potkal az pote, co mi doslo, ze ne vsichni musi pouzivat wokna. Nervy ma clovek prece jen jedny. Je ale pravdou ze s winXP se to trochu zlepsilo (vydrzi v bezet i nekolik tydnu bez restartu), netusim vsak kolik ciziho kodu do nich museli naladovat ;)
A k tomu cislu, nekdo kdo si koupi pochybne vyhlizejici disk s "orig" woknama si to stejne necha pro sebe, neznam nikoho kdo by si domu dobrovolne zavolal nejaky paka z BSA. Nechapu kdo muze na takove cislo volat? Zeby deti co se po skole nudi a bonzuji na skolnika ze na svem PC v kumbalu ma wokna od kamose a pari na nich Solitaire :)))
Jen me tak ted napadla jedna otazecka mimo: existuje pro linux neco jako "Rezim spanku" ve Windows? Tj. kom se vypne ale obsah RAM se ulozi na disk a po zapnuti vse nabehne do ~10s a programy bezi vesele dal. Zadne znovu-spousteni a otevirani dokumentu. Vse je tak jak jste to nechali pred vypnutim. Coz neni zanedbatelna casova uspora. Podle me je to rozumne skloubeni "nepretrzitho provozu" a uspory energie.