btrfs send slow / how to improve performance

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Hi,

i was trying to clone / copy a 4TB Raid 50 Array (mdadm) using btrfs send.

But btrfs send is sending with just 2MB/s. Is there any way to speed up
btrfs send?

There's nearly no I/O while running btrfs send but 100% CPU Load of the
btrfs command.

Kernel: 3.18.12
btrfs progs: 3.19.1

Greets,
Stefan
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