Slow fibre wireless speeds.

We have been experiencing slow fibre speeds when connected wirelessly, the speed connection through an Ethernet cable is around 34-36 but our wireless speeds are half that amount. This had been going on for about 6 months. I was sent a new router I believe it's the super router. Any help would be greatly received, also I lose wireless connection when I'm leaving the main room of the house and upstairs so ten have to wait to reconnect.

We have
2 iPhones wireless
2 iPads wireless
2 Apple TVs wireless
Talk talk youview Ethernet cable connection
iMac Ethernet connection
These are not used all at the same time.

Thank you once again and hope to hear back with a resolution.