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Possibly just a heck of a lot of load. Netflow is an incredibly expensive operation and might even be made even worse by virtual hardware. Just a guess, not verified in any setup, yet.

I believe that you are 100% correct in that.  I am debating if I should take the interfaces and move them from pass through to virtualized to see if it still works.

I have narrowed down a few things on the speed issue.  I tried doing a full reset on the OPNSense configuration and everything worked perfect in terms of speed.  I then started trying to disable some of the running services.  I narrowed the issue down to Netflow Distributor.  If I disable that service, my speeds go all the way up.  I am wondering what is up with that service that could be causing the problem.

I was able to get the VM to now do a 5Gb up and down on the LAN side.  The WAN side is similar.  This is after I got my configuration moved over from my Baremetal machine.  The Server is running Xeon Gold 5115.  I wonder if they are just to slow to handle much more than that.

Did you follow the tips here?

You can also try using multiqueue in the NIC settings in Proxmox and hopefully, you have enabled RSS (IDK if your walkthroughs cover that).

I switched to ESXi to see if that would help resolve some of the issues.  I was able to get the WAN side of the network to show full bandwidth (8/8).  I Did find something strange in the settings.  When I went in and checked the boxes for hardware offloading, it seemed to remove it.  When I had them unchecked, they seemed to work correctly.  So that is the good part of the testing so far.  When I check on a Windows VM on the LAN side, I get very slow download speeds, but my upload speeds seem on par to what I would think to see.

I have OPN virtualised on Proxmox. What is 8/8 ?

8gb/8gb Fiber Connection

I just installed ESXI to see if it had the same issues.  Here is something VERY strange:

Windows VM - full speed 8/8
FreeBSD 14.2 - full speed 8/8
OPNSense - reduced speed to around half

Does anyone have a VM running on an internet connection that is 8/8 or higher?  I think there is just a limitation with the virtualized interfaces not being able to handle the traffic.

I am currently running OPNSense configured like multiple of the walkthroughs show online.  After configuration, my speeds on my WAN interface (VirtIO) is almost identical to what I had with my bare metal install.  The speeds on the LAN (VirtIO) interface are horrible.  I have tried everything that I could think of to fix the issue.  The one strange thing that I saw was:



ethtool --offload ens4f1 (WAN interface) generic-receive-offload off - fixing my LAN speeds, but cuts my WAN speeds in half.  If I go and turn it back on, the WAN speed goes back to normal, but the download on the LAN download goes to almost nothing, but the upload is almost spot on.  I would rather not pass my interfaces through to the VM if I don't have to.

Does anyone else have an issue with the passthru device causing the VM to lockup?

I just recently setup OPNSense and attempted to install Adguard.  It keeps failing to start and create the yaml file on the current version of OPN.  Any suggestions on what I could possibly do to work around that?

I am wondering if it is an issue with the version of the pkg command that I am running.  I installed bhyve and just realized that it upgraded the pkg version (or I believe it did).  Would that cause this issue?

When I attempt to install any plugin, they all keep hanging at Configuring system logging...  When they get to this point, it appears to crash my Dashboard and makes the system sluggish.  This is a new install on Baremetal.  If there is anything additional I can supply to help, please just let me know.