According to new data, the multiplayer servers for Call of Duty: Black Ops 4 have been improved significantly since launch, and are running at over 60Hz as of October 27.
During the launch week of Black Ops 4, players were vocally disappointed to discover that the game was running at only 20Hz (sending 20 updates per second from the server to the client).
Beta testing had shown previously that it was running at 60Hz in the multiplayer beta, so it was a significant downgrade, leaving players feeling somewhat cheated.
Treyarch quickly made clear that they had optimized the servers specifically for the launch period, where they expected a high player count, and would continue to improve as time went on.
After a few days, some early tests indicated that multiplayer servers were running at 30Hz, and now it appears they have been improved further.
According to reddit user u/soja92, tests conducted on both PC and PS4 indicate an improvement to 62Hz in regular multiplayer matches, tested in TDM and Control.
Blackout, which was 20Hz in the beta also, is still running at 20Hz, which could remain like this for the foreseeable future, as the higher player count in Blackout matches puts added strain on the servers.
Finally, custom games are running at 20Hz client send rate, much lower than public matches. This is typical for custom games, similar to previous CoD titles.
The Reddit user who posted the data, u/soja92, does explain that this could be limited to their specific region, Northeast USA, but even if it is not worldwide, it at least shows what Treyarch is aiming for.
"Decided to run some tests today while I was playing, and I was pleasantly surprised to see the servers were running at 62Hz!
I tested blackout, but nothing has changed there. It is still running 20Hz.
This may still be a testing region, or even a delayed rollout so I can't say for sure if your region has 6(2)Hz yet but it's here at least for the Northeast region of the US!"
Treyarch has been keeping Black Ops 4 and Blackout fresh with new updates every day, and it appears that constant server improvements are being made, as promised by the studio.