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you are right, CPU Speed does matter.
I've tested following:

My Unraid Server (HOST System) runs on an older XEON 4-Core at 3,3Ghz (Xeon® CPU E3-1230 V2)
with following results testing VM-to-Host-Networkspeed via iperf3:
OPNSense only 850mbit/s
Other VMs on the same Host (ubuntu, freebsd13) 18 Gbits/sec

Other VMs on a newer Test-System (Ryzen7-5750G): 25GBits/sec

=> so CPU speed is not the reason for such poor values on OPNSense (hmm.. maybe OPNSense implements some kind of huge overhead, so it's so much slower than other Operating Systems???)

=> passing through PCIe devices is not an option for me, because I use Brigdes on Host for other VMs and Dockers.

I don't need another method to test network speed.

I need a method to improve speed to a level all other VMs (Ubuntu, FreeBSD13) reach "out of the box", and OPNsense does not.

hello, I run OPNsense as a VM using Unraid as Host.

All Interfaces als virualized using VIRTIO (also tested VIRTIO-NET and E1000).
In Web-UI they are shown as "10Gbase-T <full-duplex>".

When copying files (and testing with iperf3) I only get 1 gbit speed (iperf3 shows 850 Mbits/sec).

Other VMs on the same Host (ubuntu, freebsd13) are running successfully with 10gbit speed (iperf3 shows 18 Gbits/sec).

Settings in OPNsense: CRC, TSO, LRO are deactivated.
Tested on fresh install withoud Shaper.

My Network runs at 10gb and 2.5gbit and 1gbit - and OPNsense is the only limiting element.

Please give some hints what I could try to get full speed.

done - thank you much for "leading" me..

==>> BUG REPORT on 19.7 <<==

I run OPNSense on UNRaid VM (Q35) using virtual NICs (VIRTIO).

On 19.1 only Q35-2.6 worked, using other Q35-x.x there were no NICs detected in OPNsense.
So I ran Q35-2.6, everything fine.

Since update to 19.7 there are no NICs detected anymore!! I tried other Q35 versions, also tried a fresh install an a new VM. => 19.1 shows NICs, 19.7 does not find NICs!!

Now I run a Backup on 19.1 again.

Please HELP.. thanx a lot!!

I run OPNSense on UNRaid VM (Q35) using 8 virtual NICs (VIRTIO).

On 19.1 only Q35-2.6 worked, otherwise there were no NICs detected in OPNsense.
Since update to 19.7 there are no NICs detected anymore!!

Now I run a Backup on 19.1 again...
HELP?? thanx a lot!!