No, I have a 500mbps connection. Shows around 510mbps on Orbi, and used to show between 480-500mbps on phone over wifi. Not anymore. Really not sure what changed.So speeds are low even on the stock firmware?
Didnt you say you have 1Gb connection? if so then the speedtest on the admin panel should give you 1Gb not 500Mbps.
Also, Wifi will output a max of 400-450Mbps in ideal conditions so an wall or distance will bring that down. Also your hardware might be out of date, i got a laptop that wont go above 75Mbps