They don't? AFAIK no cloud vendor guarantees consistent performance on their multi-tenancy offerings (at least none backed by SLAs). Vendors sell both dedicated

They don't? AFAIK no cloud vendor guarantees consistent performance on their multi-tenancy offerings (at least none backed by SLAs). Vendors sell both dedicated tenancy, with consistent performance, at a higher price and shared tenancy, with variable performance, at a lower price and expect customers who choose the latter to deal with the variance on their own. Large companies run a benchmark after each instance startup to check how noisy that instance's neighbors are. If it's bad then they simply terminate the instance and start another one[0]. [0] https://www.reddit.com/r/aws/comments/547xbx/netflix_found_5x_performance_variation_between/ https://www.reddit.com/r/aws/comments/547xbx/netflix_found_5...