I don't know. I've only just come to accept that it was my issue recently after testing so many other factors I suspected more, and which turned out to not be causing any problems (Chromecast Integration Beta is the exception, that definitely was causing an issue until I removed it and re-installed).
However, last night (was having a party so the time is unknown 
) it slowed early in the evening. I didn't delete anything on the Homebridge server, only reinstalled the Homebridge app on HE. As of 20 minutes ago it was still slow, and I timed it at 10 seconds to react. All I did was disable the Homebridge app and the speed returned to normal, no errors of any kind in the log. Something isn't right with the app and 2.0.8.107.
I have a second hub, and I heard that moving it to another hub and connecting via virtual devices is stable. However, I use the second hub for beta testing, so I don't want it on there as it might taint the results. I could just disable, test and re-enable, but at this point I think I'm going to pursue other options for presence as that's the only critical part of it for me. We have automation and buttons around the house. None of us really like controlling the house from our phones to be honest, so having it available for any reason other than presence isn't important enough.
Maybe next version of Homebrige will resolve the problem and I'll revisit it at that time.
