Slower Speeds - X6S R7690P
I have Xfinity 1Gbps internet service with my own modem and router, both bought from Costco.
Modem: Netgear Nighthawk CM1100 DOCSIS 3.1 Cable Modem
Router: NETGEAR Nighthawk X6S AC3600 Tri-Band WiFi Router (R7690P)
I tested that internet speed directly from Modem over Ethernet cable to Laptop is around 900mbps. When I connect the Router, I get only ~500mbps over Ethernet. I took the snapshot from Router admin (on QOS page) and it shows only 500-600mbps. And over Wifi, I get barely ~150Mbps.
I tried every other possible options like: MTU, MIMO, QoS, Router position, firware upgrade/downgrade, SmartConnect etc. Costco even replaced it with another item, thinking first item could be defective. I'm really at loss with no clue of what could be the issue. Specifially, Wifi speeds are terrible with 80% drop in speed!!
Appreciate any other pointers.