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One of Diablo 4’s most significant technical changes is its fully connected overworld. Instead of isolated zones, players move through environments that update continuously. Enemy density, weather changes, public events and world boss timers are all managed through cloud coordination. As clients request updates, servers adjust local states to reflect global conditions. 

The setup reduces the traditional boundaries seen in older ARPGs. It requires fast, consistent communication between server clusters and player devices. When too many events occur simultaneously or the server load spikes, players notice it immediately through latency or ‘rubber-banding’. Diablo 4’s smoothness during crowded encounters is largely a result of intelligent distribution of compute processes in multiple data centres. 
— Read on www.cloudcomputing-news.net/news/how-cloud-infrastructure-shapes-the-modern-diablo-experience/