These are the first steps taken to "increase the average TTK."
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The Season Four Reloaded update for Call of Duty: Warzone just released today and with it comes the "biggest balance update in the history of Warzone." Raven Software details these changes and say that these are the "first major steps towards increasing the average time-to-kill (TTK) within Warzone."

The following changes are our first major step towards increasing the average Time-to-Kill within Warzone. It is important to note that these Weapon adjustments were not made in a vacuum. When evaluating an individual change, some may seem quite drastic, but they were made holistically and in a way that supported a lock-step increase in average TTK across multiple Weapon categories. Torso Multipliers were a considerable focus of these changes with how often they would act as flat damage increases given how consistently that location could be hit. With reductions to these multipliers, we are placing a bigger emphasis on precision — a move which we feel is ultimately healthy for the game.

Statistically, there will always be a ‘best weapon’. That is the nature of a competitive game. Players will seek out and employ any advantage they can, regardless of how miniscule it may be. We will take great care to ensure that the ‘best weapon’ never overstays its welcome and has effectiveness that scales with the skill of the handler. Conversely, there are also a great deal of players who prefer a myriad of options to choose from. Our goal is to provide exactly that. We will continue to compress outliers, both over and underperforming, until each Weapon is viable at the very least. We do not want players to feel they are at a distinct disadvantage for not conforming to the generally accepted ‘best weapon’.
The team at Raven working on Warzone say that they will be continuing to monitor weapon performance in order to ensure that the game is in a "healthy state."

These changes were introduced alongside the usual assortment of bug fixes, a new map for Zombies (Mauer Der Toten), a new multiplayer map (Rush), new weapons, new modes, a new Operator, a new Warzone mode (Payload), and more.