Sierra slow ethernet speeds

Hi,

I'm on a fresh install of 10.12.5. I'm using a Synology NAS for file storage. Under windows I got around 100Mb/s read and writes. With Sierra I got:

• 930 Mbit/s "write" and 53 Mbit/s "read" raw speed measured by iPerf
• 100 Mb/s write and 8 Mb/s read using AFP
• 62 Mb/s write and 3 Mb/s read using SMB.

You can find attached the screenshots of my measurements.

I tried various suggestions for fixing this issue but nothing really bring back my full read speed. The only...

Sierra slow ethernet speeds