How can I solve this bandwidth issue?

Not sure if this is right forum or not, thus forgive me if I need to redirect this post.

We have 1 GB Google fiber service at our home. Main router (Nest Wifi Pro) + 1 extension point (both Google products). Was installed by the team at Google. We tested from his devices and my phone to find the best location to place the extender to maximize signal strength throughout our 2 story house. I run tests weekly and internet service is blazing fast no matter the time of day.

Wife has a 2024 Macbook Pro with maxed out storage, RAM and processors( In short can handle even the largest video/photo editing and streaming challenges thrown at it). However, when I turn on TV(55" Vizio) in our living room, which is connected wirelessly to the main router, her Macbook internet tanks. Zoom, Teams, Meet lock up within seconds. Even accessing a simple website like Google or weather channel, it can take 2-3 minutes to load vs the 1-3 seconds it normally does. If I turn off the TV, her speed immediately goes back to normal. My Laptop HP Omen, my work laptop (Acer), my galaxy S25+, her iphone are not impacted when the TV is on.

I have gone through the Google Home app and prioritized her Laptop for bandwidth but that does not make any impact. Include the devices (2 laptop PC, 1 Macbook, 1 phone and 1 Android, we only have 6 other devices on wifi- (2 echos, 1 bedroom tv, and 1 doorbell cam)

Does anyone have any suggestions on what else we can do?