I have the same problem. Linux Mint with Synology NAS DS212+ with DSM 5.2
From the Synology to Linux Mint BT Sync syncs the files with normal speed (about 5MBit/s) but from Linux Mint to Synology the sync transfer rate is less than 10Kbit/s.
On both device I have installed BitTorrent Sync 2.2.
Before I had BT Sync 1.4 on both device I did not have any problems.
Sync Debian ==> Synology Very Slow
in Sync for NAS (Network Attached Storage)
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I have the same problem. Linux Mint with Synology NAS DS212+ with DSM 5.2
From the Synology to Linux Mint BT Sync syncs the files with normal speed (about 5MBit/s) but from Linux Mint to Synology the sync transfer rate is less than 10Kbit/s.
On both device I have installed BitTorrent Sync 2.2.
Before I had BT Sync 1.4 on both device I did not have any problems.