Filesystem extremly fragmented after scrub

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Hi,

I am using btrfs on a single device with crompress-force=lzo and after
I scrubbed the device once (kernel-3.12), the filesystem is extremly
fragmented - running defrag on all file didn't improve the situation
unfourtunately.
Because I have a fast SSD this is barely noticeable when booting the
system natively, however when working through VirtualBox (using direct
disk access) where each access has far higher latency, the system
responds really slow for file-system intensive tasks (VirtualBox
"hdd-led" is constantly lid in this case).
When booting fsck reports the filesystem is 26% non-continous.

Is there anything I can try to get the FS into a healthier state?

Thank you in advance, Clemens
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