Architectural vision discussion

This page from May 2014 was meant to start as a discussion of what big long-term changes we want to make in Wikimedia's and MediaWiki's architecture, and then split into a fairly stable vision document and an ongoing discussion that feeds into the document. It's been obsoleted by T96903.

Service-oriented architecture
Requests for comment/Services and narrow interfaces

Logged-in browsing should be as fast as anonymous browsing
Could we cache logged-in requests? See Architecture meetings/Performance guidelines discussion 2014-05-14 for some discussion.