The priority device setting for Nest Wifi Pro, Nest Wifi, and Google Wifi in the Google Home app gives a device of your choosing the fastest connection on your Wi-Fi network. When you prioritize a device (like your laptop or Chromecast), your Wi-Fi network reserves more bandwidth for that device to use. This means less buffering and better download speeds for that device.
You might want to do this when you stream a movie on your TV or when you play a game online. To set bandwidth preferences based on activity types, learn more about how to optimize your network for latency sensitive activities.
Note: Any device on your Wi-Fi network, whether wired directly or connected wirelessly, can be prioritized using this setting. Only one device can be prioritized at a time. When you set a priority device, 70% of your available bandwidth will be allocated to that single device and any remaining bandwidth will be shared across all other devices. If there isn’t sufficient bandwidth to your router from your ISP, this might limit the Wi-Fi speed of your other devices.
- Open the Google Home app
.
- Tap Favorites
Wifi
.
- Tap Devices
select the device you want to prioritize
- At the bottom, select how long you want to prioritize that device.
- Tap Save.
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Wifi 
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select the device you want to prioritize