It appears your network is suffering from bandwidth saturation.
This can be caused either by having too many devices connected at once or a few devices using a high quantity of bandwidth at once.
To resolve this, begin by checking to see if any devices on your local network are currently running any high-bandwidth processes. This can include video streaming or downloading files and updates. Don’t forget any currently-open browser tabs (outside this one, of course), as there may be web apps transferring data.
End any processes or disconnect any devices you suspect are currently transferring high amounts of data. However, avoid disconnecting this device, as it will help you know if you’ve been successful.
As you end these processes or disconnect devices, watch the results for Google. If saturation was to blame, you should begin to see latency drop to consistently-low values.
If it appears that network bandwidth saturation is to blame, you may need to contact your ISP to discuss increasing your bandwidth capacity. Otherwise, you may need to disconnect certain devices or limit your total bandwidth usage when partaking in any high-bandwidth or latency-sensitive activities (like video streaming).
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