Indeed the right topic
Hi from Roco the joker on the forum , “if you can’t out Tech, try to make them laugh”
My first thoughts ( while waiting for the Cavalry to arrive )
I also have bt h.hub 5 and TP power plugs to my second computer , there is a slight loss in speed , about 8% , my BT connection is Fibre to the cab , infinity 1 plan , 52 x 10 Mbps
Have you tried doing a speed test during the buffering time ?
Have you tried turning off the iPad ? "" """,
I think doing some speed tests , at several times during the day , might give a clue ,I can run both computers on youtube vids with no buffering 24/7
sorry I can't help more ,