I have a stock Macbook alu 2.4GHz with 250GB (5400rpm) HD and 2GB RAM. I have absolutely no problem with the machine whatsoever, except for when the machine is busy unpacking large/many (say 1GB or more) files with UnrarX. While UnrarX is performing its job, if I try to use any other applications they usually run quite slow which annoys me slightly. My knowledge of computers in general is quite limited, so my question to macrumors forums is: is there any way to fix this? Adding more RAM, putting in a faster HD, allocating less resources to UnrarX, or something else? Help please!