Disk speed of my Macbook SSD is worse than most of my VPSs?

So, my 13" macbook has some speed issues, it hangs a lot lately, and it's not the ram or the CPU. Look at these dd results:

$ dd if=/dev/zero of=test bs=64k count=16k
16384+0 records in
16384+0 records out
1073741824 bytes transferred in 73.744436 secs (14560310 bytes/sec)

== 14 MB/sec :(

EDIT: Macbook recently got a fresh reinstall and a Samsung 840 250GB SSD.

Now take a look at some of my VPS servers:

$ ansible spcs -a "dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync"

EDIS KVM:

vps14.sparklingclouds.nl | FAILED | rc=1 >>
dd: writing `test': No space left on device
765+0 records in
764+0 records out
50069504 bytes (50 MB) copied, 0.912368 s, 54.9 MB/s

Prometeus OpenVZ:

vps11.sparklingclouds.nl | success | rc=0 >>
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 5.90357 s, 182 MB/s

BuyVM OpenVZ:

vps1.sparklingclouds.nl | success | rc=0 >>
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 8.10506 s, 132 MB/s

Fusioned KVM:

vps18.sparklingclouds.nl | success | rc=0 >>
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 8.91558 s, 120 MB/s

EDIS Vserver:

vps12.sparklingclouds.nl | FAILED | rc=1 >>
dd: writing `test': No space left on device
8268+0 records in
8267+0 records out
541827072 bytes (542 MB) copied, 22.4639 s, 24.1 MB/s

EDIS Vserver:

vps13.sparklingclouds.nl | FAILED | rc=1 >>
dd: writing `test': No space left on device
8476+0 records in
8475+0 records out
555442176 bytes (555 MB) copied, 21.7373 s, 25.6 MB/s

Inception Hosting XEN PV:

vps17.sparklingclouds.nl | success | rc=0 >>
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 19.6996 s, 54.5 MB/s

HostSlim OpenVZ:

vps19.sparklingclouds.nl | success | rc=0 >>
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 8.98714 s, 119 MB/s

InceptionHosting Xen PV:

vps21.sparklingclouds.nl | success | rc=0 >>
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 4.18564 s, 257 MB/s

Have no idea where I bought this one:

vps23.sparklingclouds.nl | success | rc=0 >>
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 6.06838 s, 177 MB/s

Yet again no fscking idea anymore:

vps24.sparklingclouds.nl | FAILED | rc=1 >>
dd: writing `test': No space left on device
10629+0 records in
10628+0 records out
696528896 bytes (697 MB) copied, 5.34059 s, 130 MB/s

Also can't remember:

vps20.sparklingclouds.nl | success | rc=0 >>
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 9.98879 s, 107 MB/s

BuyVM OpenVZ

vps5.sparklingclouds.nl | success | rc=0 >>
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 7.30506 s, 147 MB/s

BuyVM OpenVZ:

vps3.sparklingclouds.nl | success | rc=0 >>
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 12.8532 s, 83.5 MB/s

How can I crank up this macbook? Specs:

MacBook Pro (MacBookPro9,2)
Intel Core i5 @ 2000 MHz
8 GB - DDR3 @ 1600 MHz
Intel HD Graphics 4000
Samsung 840 250 GB SSD
OS X 10.8