slow remote response...

What is your location?

I see this was posted in 2019 and it is now 2020, however, I also see that no one has explained the importance of having a good HDMI connection. I had a latency issue for several weeks and finally talked to Xfinity support. I was told to check my connections, which I had already done, all looked good. The technician had me uplug my HDMI connection and plug it back in and this corrected my latency problem.

where is the connection problem usually?  Inside the house (wireless/gateway) or from the street to the splitter?  Splitter to the room?  We have a very long run from the street box.  200+ feet.

As long as you don't move your furniture (and audio/TV gear) alot (or at all),

and you have all good, clean, tight connections inside your home, not humid like the tropics, no "katz" that like to chew on the plastic insulation of various cables, the troubles usually lie outside, from the cable networking box on the side of the home(or multi box panel for appts) where it all feeds into the building.

Now having this problem in the service area covered by Comcast of Canton Michigan.  Comes and goes, some days no issue others up to several minute delay for screen to catch up to remote commands.  As others have said, rebooting the STB solves the issue after many minutes of the box rebooting.  Very unhappy.