Apple Logic Pro /LogicExpress Discussion

hey there. i am having an issue with system overload, system too slow.

is it that i need to assign more memory to logic pro? don't know how and am frustrated. the 
system crashes when it hits only 8 or 9 tracks. i use a 24 bit firepod and have a 23" screen. 
not sure WHAT is affecting it.

i have 1GB DDR SDRAM memory and am BARELY using any elsewhere. I use a PC PowerPC G4. 
What to do!?!?!?!? HELP!!!!