As someone’s who’s played the game for an year and being diamond, i think the game is 128 tick only if you are constantly moving or active. If you stand still (hold an angle) for longer than couple of second then suddenly the servers aggressive optimization kicks in and lowers the tick rate and amount of packets you receive which is why you can’t hold angles standing still.
Overall, I’ve had a positive experience in competitive and unrated mode but swiftplays, deathmatch and team dm are not half as smooth.
The only problem that I’ve had and still do is being unable to wide swing (popping swing). I see youtubers and other players in my games go for a wide swing and enemy whiff their shots but somehow when I do it they just don’t miss and I haven’t been able to figure out why that is.
The server does not change its update rate based on your movement or inputs.