I'm trying to squeeze out a little more speed of my PrestaShop site. I have tried running Apache2 with fastcgi/php-fpm instead of mod-php, and I have tried installing and enabling APC. Using _PS_DEBUG_PROFILING_, I cannot see any substantial increase of performance, which surprises me. I have verified with phpinfo() that it is in fact running with the expected modules.
Have anyone noticed any improvement of performance tweaking this setup/parameters?