ZFS compression speeds (zeroes)

root@torrents:/downloads# for level in zle lzjb gzip-{1,2,3,4,5} gzip gzip-{7,8,9} off; do zfs create grindstone/sandbox/$level; zfs set compression=$level grindstone/sandbox/$level; echo $level; dd if=/dev/zero of=/volumes/grindstone/sandbox/$level/test.dd bs=2M count=10000; zfs destroy grindstone/sandbox/$level; done

zle
20971520000 bytes transferred in 69.293010 secs (302649863 bytes/sec)
288.629401207

lzjb
20971520000 bytes transferred in 68.783321 secs (304892519 bytes/sec)
290.768164635

gzip-1
20971520000 bytes transferred in 69.049191 secs (303718548 bytes/sec)
289.648578644

gzip-2
20971520000 bytes transferred in 71.551474 secs (293096967 bytes/sec)
279.519049644

gzip-3
20971520000 bytes transferred in 72.066975 secs (291000421 bytes/sec)
277.519627571

gzip-4
20971520000 bytes transferred in 71.332118 secs (293998280 bytes/sec)
280.378608704

gzip-5
20971520000 bytes transferred in 71.447424 secs (293523809 bytes/sec)
279.926117897

gzip
20971520000 bytes transferred in 68.370404 secs (306733890 bytes/sec)
292.524232864

gzip-7
20971520000 bytes transferred in 70.130523 secs (299035557 bytes/sec)
285.182530403

gzip-8
20971520000 bytes transferred in 69.760150 secs (300623207 bytes/sec)
286.696631432

gzip-9
20971520000 bytes transferred in 70.250436 secs (298525122 bytes/sec)
284.695741653

off
20971520000 bytes transferred in 367.048407 secs (57135570 bytes/sec)
54.4887256622