Thanks for your responses, the server is mine but the problem is that i pay for plesk panel and plesk need apache.
WRT APC, i test APC a months ago and the load o f my server up and up. eAccelerator ever work well for me. I try use Lightspeed in another server for images only and update to PHP 5.1.
I remove the Raid1 of my server and move MySQL to the secondary disk, now the response is incredible
Thanks for your tips.