What config files did you change for migrating ED to ext4? It hasn't worked so far for me; when I start OO, ez-chroot tells me 'mmcblk1p2 failed to mount on /.debian' I have successfully mounted it manually (mount -t ext4 /dev/mmcblk1p2 /.debian), but I still get the message. I believe I have set up the partition with the ED filesystem correctly (it was quite a hassle, and I did get an error, but I don't think that is the issue here). I looked at qmount, it does not seem to support ext4, maybe that is the problem. But that is a bit beyond me to change. Edit: after upgrading to the latest EasyDebian in extras-devel, and rebooting, it seems to work. I have done my benchmark again, and indeed, it does help; Fresh boot, stock speed: 1:10min 2nd try 50 secs 3rd 40 secs 4th, O/C@1000MHz: Just under 30 seconds (!)