Yesterday I upgraded HA operating system from 9.0 to 9.2 and the average cpu went from 12…20% down to 3…15%. According to my UPS the power usage went down from 4% to 3%, a 25% reduction in power (the server is not the only equipment connected to the UPS). With the current electricity price, that is excellent news! Thanks for the good work.
Please keep the power usage in mind during development, not only performance of HA.