Tried both
https://github.com/ACwifidude/openwrt/blob/kernel5.4-nss-qsdk10.0/bin/targets/ipq806x/generic/R7800-masterNSS-r14443-sysupgrade.bin
and
http://www.desipro.de/openwrt/trunk/ipq806x-nss/kong-ipq806x-generic-netgear_r7800-squashfs-sysupgrade.bin
using factory settings it seems I can not get more than 400-500 Mbits down on my WAN interface which provides ~ 1Gbits/50Mbits