sagemcom Fast5260 router is the router I was provided by spectrum which a Netgear CM600 Modem feeding. I think the sagemcom is worse my old asus ac66u, that using merlin fw which is at the other house being used. dad was complained about last night netflix was getting 3mbit last night at other end of the house. I test 2ghz and 5ghz today at that end of the house. 2ghz was getting 30-50mbit and 5ghz (that if 5ghz actual connects there) was getting round 150mbit. If I test by router 2ghz does about 100mbit and 5ghz does 450mbit. I know for fact if someone is streaming and some one is playing game on there tablet that is always connecting screen to screen those connections slow down, and I know if I play any mmo when streaming is happen latency spikes quiet a bit. there is no QOS on this router and even if there was it probably cap everything at 100mbit seeing it similar speed cpu as my ac66u which caps at 100mbit with QoS. Router is gona stay where it ( in closet on self) regardless of what happens cause my stuff is all wired for the reason of wireless still sucks imo. I been looking at the asus 86u for while or the asus ax56u now seeing it wifi 6 one is quad core other is tri core both are 1.5ghz per cor i believe. I have 400mbit speeds from isp I would be use QoS I would assume both are capable of providing 400+mbit with QoS on. Range wise and speeds will the increase vs that isp router i have? he want some sorta guarantee which i told him there is no guarantee its wireless. I just know performance of router will 2x or 4x under load vs it bogging down now with just one person streaming. I was thinking a new router that is actual capable of QOS and 400+mbit and have sagemcom become repeater for wifi which might help wifi at other end of house though I never did that before or would new router like the above me good enough?