Router is getting great speed but not to device - Fios 1gb and Orbi RBR50 w satellites

What FW is currently loaded?
What is the Mfr and model# of the ISP modem the NG router is connected too?

What devices do you have? 

Not all wireless devices are able or support speeds much over 400-500Mb. Depends on how Mfrs designed them and what actual thruput speeds they can do. Check with the Mfr of the devices to see what is officially supported. Connection rates differ from thruput rates. 

What is the size of your home? Sq Ft?
What is the distance between the router and satellite(s)? 30 feet is recommended in between them to begin with depending upon building materials.

What channels are you using? Auto? Try setting manual channel 1, 6 or 11 on 2.4Ghz and any unused channel on 5Ghz.
Any Wifi Neighbors near by? If so, how many?
What WPA security modes are you using? Try WPA2 and AES only.

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jkyorbi wrote:
Fios 1gb, Orbi router speed test results around 800mb up and down which I’m happy with. But to devices I get speed range of 40-120mb.

How can I improve speed to devices from Orbi system?

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jkyorbi wrote:
Fios 1gb, Orbi router speed test results around 800mb up and down which I’m happy with. But to devices I get speed range of 40-120mb.

How can I improve speed to devices from Orbi system?

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The following can affect you maximum throughput:

- Please make sure that the radio environment is as clean as possible. Do a wifi scan and choose the channels (2.4 GHz and 5 GHz) that are least used by your neighbours.

- If you only have one satellite, then switch off Daisy Chain (since you don't need it) to reduce any un-needed interference on the wireless backhaul.

- Activate MU-MiMO: allowing multi spatial stream sending/receiving for devices that support MU-MIMO.

- Implicit Beamforming, which allows much better data transmissions boost in the mid-long range device setups.

- If you can wire devices to Orbi then this will for sure give you better bandwidth.