Comment 8 for bug 771748

A quick work around if the bootup speed is really killing you and since btrfsck doesn't do much yet.
Please realize this prevents mountall from running btrfsck and this is NOT a fix.

You can move btrfsck somewhere where you can still use it:
$ sudo mv /sbin/btrfsck /usr/local/bin/

Then make a symbolic link to something like false:
$ sudo ln -s /bin/false /sbin/btrfsck

Also note that if btrfs-tools is updated or reinstalled, you have to do this again.

Hopefully a full btrfsck will be out soon. Cross your fingers.