I couldn't get to that site, but I did find info that pertains to all OS's not just XP entitled Building Fast-Booting PCs for End Users, http://www.microsoft.com/hwdev/newPC/fast-boot.htm
this might be of interest.
Windows XP Booting Time Tuned Up By 50%<STRONG>...We came across a fine piece of software called BootVis. BootVis is a system analyzer and boot optimization tool. Reports on PC sites show a decreased booting time of Windows XP up to 50%! This tool comes from M$ and apparently rised from the Windows XP beta testing timeframe...</STRONG>