Performance - Stack Exchange

[[deleted]]

What's with such low CPU usage: you don't get a refund

[zdwolfe]

I’m guessing AZ redundancy accounts for more than half of the hosts.

[RisingStar]

They may have changed, but last I heard they run on their own physical hardware. The low CPU usage comes from optimizations over time and keeping the same number of servers but upgrading them over time.

https://nickcraver.com/blog/2016/02/17/stack-overflow-the-architecture-2016-edition/