My speed tests shows:

# hdparm -tT /dev/sd[ab]

/dev/sda:
 Timing cached reads:   1544 MB in  2.00 seconds = 771.83 MB/sec
 Timing buffered disk reads: 170 MB in  3.02 seconds =  56.28 MB/sec

/dev/sdb:
 Timing cached reads:   956 MB in  2.00 seconds = 477.70 MB/sec
 Timing buffered disk reads: 106 MB in  3.04 seconds =  34.91 MB/sec

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https://bugs.launchpad.net/bugs/1218568

Title:
  [btrfs] slow boot

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