To be honest mate that cpu is very old in years and performance, i had an athlon chip back in the day, upgraded all my pc internals probably 4 times since then.

The performance increase by upgrading would be like night and day, my cpu is a quad core i7 chip, it has hyper threading tecnology which lets each of the four cores of the cpu handle two tasks each which in effect is like having 8 cores, four physical and four virtual.

Theres even hex core cpus now ( 6 cores ) but you wouldnt need to go that far.

Dave.