Causes for bandwidth reduction

[beneix]

For ISP reasons, I am forced to connect my OPNSense router behind my ISP's fibre router, set to DMZ. When I compare the bandwidth I get directly from the fibre router to what I get through OPNSense, there is a significant reduction (although an improvement in bufferbloat). What could be the different contributing factors to this? In terms of hardware, the OPNSense router has:
CPU: AMD Embedded G series GX-412TC, 1 GHz quad Jaguar core with 64 bit and AES-NI support, 32K data + 32K instruction cache per core, shared 2MB L2 cache, 4GB DRAM
NICs: i210AT 1Gb/s

Fibre router:
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OPNSense behind fibre router:
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Are there specific OPNSense configuration tweaks I should try to reduce the bandwidth reduction?

[meyergru]

See this, #10.

[Seimus]

What could be the different contributing factors to this? In terms of hardware, the OPNSense router has:
CPU: AMD Embedded G series GX-412TC, 1 GHz quad Jaguar core with 64 bit and AES-NI support, 32K data + 32K instruction cache per core, shared 2MB L2 cache, 4GB DRAM
NICs: i210AT 1Gb/s

Exactly this.

You are running a 1G line on a APU2. Depending on the configuration of your OPNsense (like Shaper etc.) this is the MAX you can get and I would bet the throughput you get is variable.

My old APU2 was capable merely 400Mbit with Shaper and few VLANs.

Regards,
S.