dual boot slow

[truthspeaker]

have install windows XP and windows 8.1 as dual boot.
windows XP install on first partition and windows 8.1 install on second partition on the same hard disk drive.

when i chose windows XP it takes long time to boot into windows XP.
i want to know why booting to windows XP takes long time.

when i chose windows 8.1 it boots quicker.
but when i restart windows 8.1 it takes long time to restart.

[qasdfdsaq]

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