So the last HH5 I flashed with Openwrt I used version 17 and it ran well on Plusnet/BT fibre to the cabinet, but the last hub I flashed I used version 19 of Openwrt, latest build as of a few weeks ago (don't know the exact build until I check tomorrow) and the download sync rate on Plusnet service is 70Mb+ but I cannot get the download rate to exceed 18Mb.
To confirm, I have used the BT Wholesale Speed checker and also various local servers from Speedtest.net which all give me the same result. It is not a line issue as the old router and BT Openreach modem give both good sync and download rates of near 68Mb.
I've tried software offloading which actually seemed worse.
I've tried altering the MTU to 1500, 1508 and also turning off MSS clamping, but nothing seems to improve it.
I've also tried swapping between Annex A and B to no avail.
If I can't resolve it I will have to try downgrading to version 17 which seems backwards to me.
Any ideas please?
Thanks