External devices like AppleTV, Roku or Xboxes are responsive. It’s the actual TV UI that tends to be very slow and laggy.
I still prefer Apple TV for various reasons, though, responsiveness being one of them.
Even a second lag is insane. I don't understand how people tolerate that.
I Piholed mine with an edge router and redirected port 53 traffic that didn’t come from the Pihole, back to the Pihole with a script.
However I’ve upgraded to a Dream machine pro, and haven’t worked out how to do that so just removed it from having any network access.