Ok,
V4 of this hotfix has been released.
Once you install the hotfix V4 then complete the registry edit:
1. Click Start, click Run, type regedit, and then click OK.
2. Right-click HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Session Manager, point to New, and then click Key.
3. Type Throttle for the new key name.
4. Right-click Throttle, point to New, and then click DWORD Value.
5. Type PerfEnablePackageIdle for the value name.
6. Right-click PerfEnablePackageIdle, and then click Modify.
7. In the Value data box, type 0. Make sure that Hexadecimal is selected in the Edit DWORD Value dialog box, and then click OK.
Along with the boot.ini /usepmtimer tweak, I am loading up programs like Adobe Photo, Catalyst Control Center (which is notorious for being slow) BF2, CS:S, etc a whole lot faster now. I use the Adobe Photo program a lot and it didn't make sense to me why it was taking so long to load up (after a format, XP reinstall). But this does the trick. The reason for this update is to inform you of the v4 Hotfix. OP indicated the v3 hotfix.