Optimizing Websites like Stack Overflow - MS Dev Show Podcast
Apparently site is still running on a single IIS and SQL Server! 44th global web site!
So what is the "trick?" Continuous "engineering optimization" of every part of system.
Most important next improvement: HTTP 2.0
Stackoverflow.com Traffic, Demographics and Competitors - Alexa
Global Rank 44 3
Rank in China 33
Nick Craver - Stack Overflow: The Architecture - 2016 Edition
Performance - Stack Exchange
Pricing - Windows Virtual Machines | Microsoft Azure