DEC750 realistic 10G expectations

[ou1]

Hello community

I have a DEC750, a 2-year old model with 2.5G ports.

On the WAN side, I have a 10G XGS-PON module, 10G internet plan from my provider. The WAN interface requires a non-default VLAN tag.

For testing, I plugged my PC directly into a 10GBe transceiver in the DEC750 using default VLAN 1.

Doing internet speedtests, the highest speed I can achieve is 5.2Gbps (iperf3 with parallel streams, speedtest net, cnlab). Is this to be expected? I don't want to spend too much time trying to increase this if it's already maxing out the firewall throughput of the DEC750. What I haven't tried is disabling the firewall on the DEC750, but this falls into the "spending too much time" category since I'd never use it in that configuration.

Using the router provided by my ISP, I can reach just over 8Gbps in speed tests.