how to speed up more os X

[Alain RAZAKARIVONY]

hi !

I bought a new ibook 700Mhz one month ago. It works fine.
But it was too slow so today I bought a 256 Ram.

Now, is there any way to speed up more OS X (on windows you can setup 
start-up programs) ?

And how to remove software ? (on windows you have uninstaller and 
add/remove programs) ?

Can a remove os 9 ? (I have MAC os 10.2.4) because it takes too much 
disk space.

I am a switcher , if any one can help me. ;-)

Thanks.