Extremly low network speed on NAS access

Hi,
I've serial problems with my network. The speed does does not allow to run Time Machine on my NAS (Buffalo LS-WXL).
It takes some times minutes to open display the content of rectory of 
Even with my new infrastructure: CAT7 cable, CAT 6a connectorand netgear LS108E Switch (Gigabit), iMac 27 (2010) there is no improvement.
The max. speed is 6-7 MB/s.
If I run a Windows PC with the same infrastructure it works with 35-20 MB/s, which is not really convincing in a Gigabit network, but much better comared to the MAC.
I'am running the NAS with the AFP-protocoll.
Does anyone know what to do?
Thanks in advanced,
best regards
Thomas

That device is unsupported by Apple and unsuitable for use with Time Machine. I know this isn't the answer you want, and I also know that the manufacturer says the device will work with Time Machine, and that it usually seems to work. Except when you try to restore, and find that you can't.
If you want network backup with Time Machine, use as the destination either an Apple Time Capsule or an external hard drive connected to another Mac or to an 802.11ac AirPort base station. Only the 802.11ac base stations support Time Machine, not any older model.
If you're determined to keep using the NAS for backup, your only recourse for any problems that result is to the manufacturer (which will blame Apple.)

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