Quote Originally Posted by jrch2k8 View Post
for example
Qt-gui with -o2 native is fast ofc but you notice few Ms delay between click and apps opening
Qt-gui with my 30 flags is almost open when you take your finger of the mouse
Qt-gui with my 30 flags + PGO[<-- not easy] is instant i mean freaking instant

so if you dare to play with your compiler setting you can gain some free perfomance and squeze some additional responsiveness
my friend please share the mentioned flags you use. Others like me for instance would like to try them as well I believe to see how their millage varies.

Personally on my install I usually go conservative like -O2 on system libs, -O3 --ffasth-math (or -Ofast) on multimedia & archive compression stuff and few more tweaks here and there