>>10
Realistically... it won't help much. A computer that still has only 256 MB of RAM is probably so slow and swaps so much that it really makes no difference. Let's say you save 10% of the time, which is ridiculously exaggerated. Well, so now it takes 9 seconds for an explorer window to open instead of 10, when the system is swapping. Awesome.
Just get more RAM or a new computer.