How can I speed up my computer?

I'm currently running a 256RAM Pentium III piece of shit.

Running Firefox and winamp (with the classic skin) lags like a bitch.

How can improve my computers' response speeds without buying a new processor?

>>6, name something better that doesn't rape your computer's memory, and maybe i'll consider. I have used firefox until now, it sucks up ALOT of memory. (At least for a computer with 256Mb RAM