Gigabit service but less than 500mb download

[ajb999]

Using the gateway from Xfinity I'm only getting half the speed I'm paying for. Is it a problem with the service? Should I downgrade to the appropriate tier to what I'm getting for speed? Only had it for a week but have checked speed test right next to gateway and at best have got around 480mb/s for gigabit price.

[EG]

Start with this; 

https://forums.xfinity.com/t5/Your-Home-Network/Gigabit-speed-troubleshooting-video/m-p/3310454#M316...

[ajb999]

If wifi speed isn't the same as ethernet it should be advertised and shown as such. I know it's up to but half isn't even close.