Microsoft has chosen a completely different path for XP and its boot features by trying to incorporate as much support for newer fast boot BIOSes that are on most current motherboards. They built XP in such a way as to make it able to take advantage of features in these new BIOSes and one of the coolest things is a small application called Bootvis. Bootvis watches everything that loads at boot time, from the moment the OS begins to load just after POST (Power on Self Test) to the moment you get to a usable Desktop.
Some Programs, most notably Antivirus software, suck up valuable seconds before you can actually do anything even though you’re at the desktop. Bootvis generates a trace file that you load and can then “see” a visual representation of what’s happening. Every file, driver, hard drive read/write, etc., is recorded. You can then use bootvis to optimize the loading of files during the boot sequence. Bootvis will rearrange the ways these very files are stored on the hard drive, thereby improving the boot time dramatically