In a recent post to Reddit, Treyarch listed the improvements you can expect to find in their latest patch for Call of Duty: Black Ops 4, which includes performance enhancements for Zombies, Blackout, and regular multiplayer alike. You can check out the full list, below:
Call of Duty: Black Ops 4 Update
General:

Addressed a crash at the end of matches for Master Prestige players in Multiplayer and Zombies. We?re planning further improvements for related UI issues in a future update.
General stability improvements across all modes.

Zombies:

Miscellaneous

Addressed a crash when crafting the Shield with Frugal Fetish equipped.
Various stability fixes across all maps.

Blood of the Dead

Addressed an issue with the Shield not displaying the correct updated version for the player.
Classified

Addressed a crash when turning on the power in a Custom Mutations match.

Blackout:

Stash Looting

Addressed an issue where players had to scroll right or left on the d-pad multiple times to navigate through Stash lists.

Circle Collapse

Addressed an issue where the Collapse circle would sometimes appear invisible to players.

Multiplayer:

Scoreboard

Addressed an issue that highlighted the wrong score on the scoreboard if the scoreboard was opened immediately after death.

Specialists

Jumping while sprinting with Ruin now performs the same as with all other Specialists.

Treyarch stresses that they?re aware of network performance issues that have been cropping over sinc...