When I installed my Nest Wifi the first time the connection speed throughout the house almost tripled - nice!
Now though, the speed in the two rooms that have the satellite wifi points, speed is about 20% of the Google wifi router point. The Home app mesh connection test now shows that the connection to both satellites is weak
The only thing that has changed is that I have installed a new TV and soundbar, positioned next to the Google Wifi router, and replacing a similar system.
I have done a complete reboot of the system, including the router to which the Google Wifi router connects, but no change. The satellite points are about 10 meters each from the router in a timber/plasterboard house.
Sorry to hear it's still affecting you, but let's jump in and start sorting this out. Real qucikly, can you check in your Home app to see if you have any preferred activities set up? You can select gaming or video conferencing. If either are checked, try removing them. Let me know if that has any impact.