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Could anybody help me with this performance question:

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Network Attached Storage (NAS) for home and business, Synology is dedicated to providing DiskStation NAS that offers RAID storage, storage for virtualization, backup, NVR, and mobile app support.

I'm using a dreambox, dm7020 and a synology diskstation DS207.
I automounted the share 'video' (/volume1/video) of the diskstation to the dreambox with the following entry in the dreambox /var/etc/automount.conf:
DS_video -fstype=nfs,rw,soft,udp,nolock,rsize=32768,wsize=32768 192.168.1.100:/volume1/video

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It is now possible to e.g. copy videos from the dreambox hdd to the diskstation.
I experienced roughly 3MByte/s for writing to diskstation (2,2GB took 13 minutes for copy).
Then I tried to watch the copied movie via dreambox directly from the diskstation (=read access) - but seems to be to slow to stream.

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Doesn't work.
Is that a performance issue? Thanks in advance for your help!
PS: I'm using Gbit ethernet