XP and computer tweaks ?

I did not know where else to post this.
Im new to the overclocking/tweaking thing. Ive been told that if you buy a computer from these custom places ( Voodoo/Ailenware etc..) that the reason they are good for gaming is that the computer has been tweaked for games. What are they doing to tweak the os/comp?

I just installed XP on my comp. I have tweaked the os 2 ways. 1. tweakxp program and the 2nd is a xp server guide that tells you what servers you do not need to have running. My friend has less framerate lag then I do on the game we play and his computer is slower then mine.

My specs.
P4 2.0 gig
384 megs PC800 mem
gforce 3 Ti 500 64 meg
40 gig 7200 rpm HD
soundblaster x-gamer 5.1 sound card
XP pro OS
cable ISP

His specs.
Athlon 1700xp
512 DDR mem
gforce 2 64 meg PCI.
sounblaster x-gamer 5.1 sound card
cable ISP
windows 98 se OS

what else can I do to my system to speed it up without overclocking it? and why do I have slower framerates?

Thanks all

<A HREF="http://www.blkviper.com/WinXP/servicecfg.htm" target="_new">Comprehensive Service Page</A>
Descriptions and necessity of services; <b>very</b> helpful

Disable Hibernate and System Restore, because it takes some space and power.

Have your paging file changed to a set amount. I'd recommend 500MB. If you have only one partition, download <A HREF="http://www.vopt.com" target="_new">VoptXP</A> and optimize it to the front of the hard drive.

If there's more, I'll post back.
Bryan

P.S. Maybe my site can help(?)

<A HREF="http://www.btvillarin.com" target="_new">btvillarin.com</A>
<font color=red>Site's back up! L33t!</font color=red>

What is GTU and where can I find it?