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I tried exFAT in order to use my external hdd on both mac and windows but I found it's so much slower than HFS+. The speed is noticeably different when I tried to fast forward movies (over 4gb).

exFAT was recommended in this question.

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There also is a heavy i/o speed decreate when accessing exFAT formatted volumes through Java applications. We have got experience with CrashPlan that moves exFAT located archives roughly 5 times slower compared to archives stored on HFS volumes. –  Pro Backup Jul 24 '12 at 13:29
    
Did you format your disk with Windows or with Mac OS? –  codingFriend1 Dec 11 '12 at 9:19
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up vote 1 down vote accepted

exFAT is a file system optimized for flash drives, meaning storage devices without moving parts where seek times are constant. It sounds like you're using it for a mechanical hard drive – which is what's causing the poor performance that you're experiencing.

You should reformat the drive to HFS+ or FAT32 and only use exFAT for solid-state drives.

ref: http://en.wikipedia.org/wiki/ExFAT

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this is BS. ExFAT performance on OSX sucks regardless of media. –  UnbanRonMaimon Dec 20 '13 at 22:55
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