Actually, I'm not so sure about this. As soon as I installed HG, CPU usage went up to 80% minimum. That's not good.
On my RPi1 the cpu usage is around 30% IIRC. If it stays at 80%, I'd say that's a problem. If the usage spiked when you started HG, you can try some things.
First, restart the service:
sudo service homegenie restart
Second, if that doesn't change anything, I'd probably try resetting the HG setup. That can be done from the web interface under maintenance I believe.
Third, uninstall HG and check cpu usage. If it's basically 0%, reinstall. I forget the uninstall command at the moment so hopefully it won't come to that.
Finally, if nothing else works, you could try re-imaging. I don't think that will be necessary, but if so I'd opt for starting with a new card rather than formatting. That way, you can maybe do some sleuthing to determine the issue (if you care).