Massive PPPoE performance drop in 23.x with Archer C7 v2

Installing and Using OpenWrt Network and Wireless Configuration
5

First correct MSS:
in /etc/nftables.d/mssfix.nft

chain mangle_postrouting {
                type filter hook postrouting priority mangle; policy accept;
                oif $wan_devices tcp flags syn / syn,fin,rst tcp option maxseg size set rt mtu
}

(fw4 check && service firewall restart)

Then apply this patch (note if ppoe lowlevel device is not vlan like eth0.1 it is not sufficient)

-> view file -> raw -> upload to /usr/share/ucode/fw4.uc (backing up original just in case)
then do the firewall check & restart

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