I have just upgraded my PC from a PIII to a P4.  I know I can use emerge -e system and emerge -e world  to rebuild the system with the new settings from make.conf.  I have done the kernel already. 
 
What I want to know is are there any "safe" flags that I should add to increase overall system performance?  Right now I use none (other than march=pentium4) and have optimisations at -O3 (or 03).  I have not had too many problems with compiling in the past one the PIII.
 
Suggestions?
 
Thanks, Don



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