I didn't say "would", I said "most likely", and I'm not swearing to any of it because I am no guru of Windows XP.
I have done some experimenting myself and have tried all those tweaks that were just posted.
I have not been able to tell any difference whatever way I go. Most likely because I do have the 512 megs of ram anyway and running a fast CPU. Perhaps the more I experiment with XP, I will come to more concrete conclusions for my own system.
The large system cache reg tweak is the one that changes the checkbox in the memory setting from "Programs" to "System Cache"
That's why I asked this question to begin with. To hear from others what difference they have noticed.
I have also run my system without a pagefile and again, don't notice any performance increase.
I think this "to pagefile or not to pagefile" and "size of pagefile" debate is going to be never ending with no apparent clear cut answer everyone is going to agree on. Hell, I bet even people within Microsoft won't even necessarily agree with each other on some of this. I can even picture little electron size gremlins arguing with each other about this inside the computer!
Different points of view and different claims are rampant and diverse. I'm still trying to figure this stuff out myself.