I do not know why? But I found that Windows XP computers using only one core at boot time. If you want your windows xp is faster at start-up, you must change it, this is very easy. Here’s how:

Operating System Windows XP many interface with menus that slide into view, shadows effect that create three-dimensional effects, and rounded corners that soften the appearance of windows. For an older computer, these effects ┬ámake slow down it’s performance. For example, dialog boxes and menus might not open smoothly. To improve and make faster the performance