As far as I know fewer active parameters means faster. There’s less arithmetic calculations to be done per pass. But all parameters need to be kept in memory, because they might become active the next pass. So it won’t save any RAM.
They have a short paragraph in the description. It has 80B total parameters, 3B active each pass. It achieves performance like a 30-60B model (10-20x, their claim). But is way more efficiant than that with only 3B active parameters.





HA isn’t the only option. I think there’s two other open source smarthome solutions out there(?) And you could probably do with just an MQTT broker and a Python script, or something like that…
But HA isn’t a bad choice. They’re doing a phenomenal job. And related projects like ESPHome make it really easy to integrate microcontrollers. And if you want to do more smarthome stuff, it has a plethora of features, integrations, an app…
Extra hardware isn’t absolutely necessary. I have one server at home which does NAS, and I use 4GB of it’s RAM to run a virtual machine with Home Assistant. That’s enough for it, including a bunch of Addons.