does some know if the GIGABYTE GA-J1900N-D3V inkl. Intel
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If you can run multiple simultaneous downloads and the combined speed of those downloads can reach 6.5 Megabytes/s that would imply a CPU limitation on the UTM.
Since IPS being turned on or off does not impact your download speed with a single connection, and in theory your CPU usage is very similar, that means the NICs are causing extremely high CPU usage in this scenario.
Your options to improve performance would be the following:
1) Replace the onboard NICs with something else (Intel/Broadcom card)
2) Hope that a future update reduces CPU overhead with those NICs
3) Be happy with 20 to 30 mbits per stream and accept that you will need more than one simultaneous transfer to max out your internet connection.
Since all of your networking equipment internally appears to be gigabit your layout is probably fine. Direct connection to the UTM ruled out your local network equipment being the issue.
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