

Well ya, you need at least two NICs to properly setup a firewall. Additionally, since NICs are the most crucial piece of hardware for routers and firewalls, it’ll only be as good as the hardware it runs on. Older NICs lead to regular crashes and/or slow network speeds. So swapping the original NIC out and adding another is VERY typical when repurposing old PCs as a router. The most common options for NICs I’ve seen are the Intel I350-T2 and I350-T4. Ironically, they cost about as much as a decent router, but going this route actually puts you in control of your home network!

Maybe run a good windows debloater on the device? I was impressed by how much smoother my Win10 VM ran afterwards! Here’s a link: https://github.com/raphire/win11debloat
PS: Works for Win10 & 11