Thanks for your help there oiaohm. The link Code: http://www.manpagez.com/man/8/renice/ leads to a missing php. I will search it from another site so dont worry bout it. So you actually say to me that i need to write more command lines and separate them as #renicing #running the application Also, the applications that are being running with root privilege are about 100 PID on my system. ( i think there are some :/ ) Is there any way other than renicing to squeeze more my Linux to accelerate opengl (and.. i know.. direct3d although it can support it)?