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I had to do the same as of September 2026
(OPNsense 26.7.4_1-amd64)

System Tunables to -
dev.netmap.buf_num: 1000000
dev.netmap.admode: 0   
dev.netmap.ring_num: 256   
dev.netmap.buf_size: 4096

and reboot.

Many thanks!

I too had the boot loop and was able to disable an onboard Realtek (it was enabled but not in use).  I had removed the Realtek plugin before this attempt and still had the boot loop.  I've been using a dual Intel NIC as my primary card.  This did allow a successful boot; however, the interface names had changed and the IP changed.  A quick reconfiguration by adding the IP I had originally and deleting/reconfiguring the DHCP which had the wrong interface name got everything going.  Reviewing everything now to see if all else is OK...
Edit - Using Intel(R) PRO/1000 82576 Dual NIC

I also had to SSH and reinstall the pkg after receiving an upgrade error.   Thanks for all of the hard work.  26.1_4 is running exceptionally well.