Does anyone here facing overall slow performance on booting up (every time), Slow Login after enter the Login password, Slow in opening an application and etc?

Is there any tweak available for me to make the performance burst up ?
I have uninstall by uncheck ZESM and Image MGM, and disable Remote MGM, but my user still keep complaining the overall performance is unexpected.

C2D, 4GB RAM, Windows XP.

thank you.