Why stop settle for just -O levels? You could fiddle with all flags that might affect performance. You could even write a program that automates this and employ

Why stop settle for just -O levels? You could fiddle with all flags that might affect performance. You could even write a program that automates this and employs generic algorithms to reach good results quicker... http://stderr.org/doc/acovea/html/acoveaga.html http://stderr.org/doc/acovea/html/acoveaga.html