Processes like firefox and thunderbird often consume substantial CPU and therefore battery even when minimized. One can sleep processes by hand using pkill -SIGSTOP firefox and wake them up with pkill -SIGCONT firefox This often gives me battery savings of 50% ! It would be even nicer to integrate this behaviour in the window-manager. The idea is to SIGSTOP programmes when minimized and wake them up when unminimized. A white/blacklist would determine which programmes are treated this way.
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