The delay/lag is annoying but eventually goes away.
I connected Contour in Spring-19 and there was no sluggishness with the remote. About 6 months later (Oct), however, it started responding like Jell-O. I shared on the Forum but Cox had no expertise.
https://forums.cox.com/forum_home/phone_forum/f/phone-forum/24075/call-history/92742#92742
My guess is Contour is either installing an update or CRC-ing after an update. This mysterious process lasted 2-3 days and eventually cleared. Then 10 days later, the sluggishness returned and lasted another 2-3 days. Again, it eventually cleared and I haven't experienced it in 4 months.
Again, best guess, it's a once or twice process which eventually completes. Kinda like a Windows Service Pack update.