I had a slow startup too. I installed Kubuntu 11.10 choosing btrfs as file 
system, and noticed was booting far slower than ext4. I asked in IRC channel 
and Chris Mason (wow!) troubleshooted it (how incredible is FOSS world?).
[20:33] <cmason> ok, start with the fstab
[20:33] <cmason> UUID=d5acc217-d524-4a2d-a937-bad945a047b2 /       btrfs   
defaults,noatime,nodiratime,subvol=@ 0       1
[20:33] <cmason> last number should be a zero, should just change fsck.btrfs to 
a noop
fsck is slow, because it's not intended as a boot-time check

In fact after this change my atom single core boot time dropped from 111 sec to 
80 sec
Marco

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https://bugs.launchpad.net/bugs/791020

Title:
  Slow boot cause of btrfs

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