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Google is discontinuing the Chromecast line
(www.theverge.com)
This is a most excellent place for technology news and articles.
That sound like you need a more serious setup, where you can control the network priorities and set a QoS, so the devices that you use interactively get priority over the other devices.
My mesh network actually allows me to set devices as priority. I guess I've never tried it out and am too lazy to go start pulling cables.