I installed opnsense on an i5-6500T (native, no vm) but it looks like the performance is very bad, most websites are timing out.
everything is turned off, there's no packet inspection or blocks, even the unbound dns server is not used (using a DC for that)
it's the computer that's underpowered, or i did some mistake in configuring it? Using two routers in the networks for my convenience
Good point, a double NAT setup can cause weird issues.