I'm struggling to remember who, but I just recently saw a tech talk about microservices at scale by a fairly large company that had started adopting more effici

I'm struggling to remember who, but I just recently saw a tech talk about microservices at scale by a fairly large company that had started adopting more efficient request/response formats because they discovered that in their tens of thousands of cores, some high single-digit percentage of all CPU cycles were spent marshaling and unmarshaling JSON.