Azure recently introduced an advanced, more efficient Load Balancer platform. This platform adds a whole new set of abilities for customer workloads using the new Standard Load Balancer. One of the key additions the new Load Balancer platform brings, is a simplified, more predictable and efficient outbound port allocation algorithm.
While already integrated with Standard Load Balancer, we are now bringing this advantage to the rest of Azure.
Read more about it in the Azure blog.