I have played the non-cp and cp servers for some time, and the cp cyrodil server is in really really bad shape.
Here is a list of the issues that have been occurring:
(1) People crashing on a massive scale during EPIC keep battles. For example: an hour long epic battle for roe that ends in a massive crash. fight over. how disappointing for everyone.
(2) Attacks are not synchronized due to the lag. For example: on my screen i see myself attacking a player, but the damage numbers don't show for a few seconds later, if at all.
(3) Ping seems high compared to non-CP cyro.
I'm assuming most of the issues are just based on the fact that CP cyro has a lot higher population than non-CP.
All of these issues combined are making it really hard to enjoy pvp in CP cyrodil, one could definitely make an argument that this is unplayable, and that's a real shame.
I'm hoping the development team could take a serious look here and try to resolve these issues.
Thanks.